update grid4 & heroledger models

Merge pull request 'main' (#13 ) from main into development
Reviewed-on: #13
2025-09-16 14:18:08 +02:00 · 2025-08-28 14:05:57 +00:00 · 2025-08-27 18:52:11 +02:00 · 2025-08-27 14:44:39 +02:00 · 2025-08-21 17:26:42 +02:00 · 2025-08-21 17:26:40 +02:00
155 changed files with 4923 additions and 2209 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -65,13 +65,13 @@ checksum = "7c02d123df017efcdfbd739ef81735b36c5ba83ec3c59c80a9d7ecc718f92e50"

 [[package]]
 name = "async-trait"
-version = "0.1.88"
+version = "0.1.89"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e539d3fca749fcee5236ab05e93a52867dd549cc157c8cb7f99595f3cedffdb5"
+checksum = "9035ad2d096bed7955a320ee7e2230574d28fd3c3a0f186cbea1ff3c7eed5dbb"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 ]

 [[package]]
@@ -123,9 +123,9 @@ dependencies = [

 [[package]]
 name = "bitflags"
-version = "2.9.1"
+version = "2.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b8e56985ec62d17e9c1001dc89c88ecd7dc08e47eba5ec7c29c7b5eeecde967"
+checksum = "6a65b545ab31d687cff52899d4890855fec459eb6afe0da6417b8a18da87aa29"

 [[package]]
 name = "bitvec"
@@ -168,7 +168,7 @@ dependencies = [
 "proc-macro-crate",
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 ]

 [[package]]
@@ -213,18 +213,18 @@ checksum = "d71b6127be86fdcfddb610f7182ac57211d4b18a3e9c82eb2d17662f2227ad6a"

 [[package]]
 name = "cc"
-version = "1.2.31"
+version = "1.2.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3a42d84bb6b69d3a8b3eaacf0d88f179e1929695e1ad012b6cf64d9caaa5fd2"
+checksum = "3ee0f8803222ba5a7e2777dd72ca451868909b1ac410621b676adf07280e9b5f"
 dependencies = [
 "shlex",
 ]

 [[package]]
 name = "cfg-if"
-version = "1.0.1"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9555578bc9e57714c812a1f84e4fc5b4d21fcb063490c624de019f7464c91268"
+checksum = "2fd1289c04a9ea8cb22300a459a72a385d7c73d3259e2ed7dcb2af674838cfa9"

 [[package]]
 name = "cfg_aliases"
@@ -372,7 +372,7 @@ checksum = "162ee34ebcb7c64a8abebc059ce0fee27c2262618d7b60ed8faf72fef13c3650"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 ]

 [[package]]
@@ -452,9 +452,9 @@ dependencies = [

 [[package]]
 name = "hashbrown"
-version = "0.15.4"
+version = "0.15.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5971ac85611da7067dbfcabef3c70ebb5606018acd9e2a3903a0da507521e0d5"
+checksum = "9229cfe53dfd69f0609a49f65461bd93001ea1ef889cd5529dd176593f5338a1"

 [[package]]
 name = "heck"
@@ -491,10 +491,12 @@ dependencies = [
 name = "heromodels-derive"
 version = "0.1.0"
 dependencies = [
+ "heromodels_core",
 "proc-macro2",
 "quote",
 "serde",
- "syn 2.0.104",
+ "serde_json",
+ "syn 2.0.106",
 ]

 [[package]]
@@ -545,7 +547,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fe4cd85333e22411419a0bcae1297d25e58c9443848b11dc6a86fefe8c78a661"
 dependencies = [
 "equivalent",
- "hashbrown 0.15.4",
+ "hashbrown 0.15.5",
 ]

 [[package]]
@@ -597,7 +599,7 @@ checksum = "03343451ff899767262ec32146f6d559dd759fdadf42ff0e227c7c48f72594b4"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 ]

 [[package]]
@@ -627,9 +629,9 @@ dependencies = [

 [[package]]
 name = "jsonb"
-version = "0.5.3"
+version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "96cbb4fba292867a2d86ed83dbe5f9d036f423bf6a491b7d884058b2fde42fcd"
+checksum = "a452366d21e8d3cbca680c41388e01d6a88739afef7877961946a6da409f9ccd"
 dependencies = [
 "byteorder",
 "ethnum",
@@ -647,9 +649,20 @@ dependencies = [

 [[package]]
 name = "libc"
-version = "0.2.174"
+version = "0.2.175"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1171693293099992e19cddea4e8b849964e9846f4acee11b3948bcc337be8776"
+checksum = "6a82ae493e598baaea5209805c49bbf2ea7de956d50d7da0da1164f9c6d28543"
+
+[[package]]
+name = "libredox"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "391290121bad3d37fbddad76d8f5d1c1c314cfc646d143d7e07a3086ddff0ce3"
+dependencies = [
+ "bitflags",
+ "libc",
+ "redox_syscall",
+]

 [[package]]
 name = "lock_api"
@@ -760,6 +773,7 @@ dependencies = [
 [[package]]
 name = "ourdb"
 version = "0.1.0"
+source = "git+https://git.ourworld.tf/herocode/herolib_rust#aa0248ef17cb0117bb69f1d9f278f995bb417f16"
 dependencies = [
 "crc32fast",
 "log",
@@ -792,9 +806,9 @@ dependencies = [

 [[package]]
 name = "percent-encoding"
-version = "2.3.1"
+version = "2.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
+checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"

 [[package]]
 name = "phf"
@@ -906,9 +920,9 @@ dependencies = [

 [[package]]
 name = "proc-macro2"
-version = "1.0.95"
+version = "1.0.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "02b3e5e68a3a1a02aad3ec490a98007cbc13c37cbe84a3cd7b8e406d76e7f778"
+checksum = "89ae43fd86e4158d6db51ad8e2b80f313af9cc74f5c0e03ccb87de09998732de"
 dependencies = [
 "unicode-ident",
 ]
@@ -1079,12 +1093,13 @@ checksum = "a5a11a05ee1ce44058fa3d5961d05194fdbe3ad6b40f904af764d81b86450e6b"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 ]

 [[package]]
 name = "rhailib-macros"
 version = "0.1.0"
+source = "git+https://git.ourworld.tf/herocode/herolib_rust#aa0248ef17cb0117bb69f1d9f278f995bb417f16"
 dependencies = [
 "rhai",
 "serde",
@@ -1143,9 +1158,9 @@ checksum = "56f7d92ca342cea22a06f2121d944b4fd82af56988c270852495420f961d4ace"

 [[package]]
 name = "rustversion"
-version = "1.0.21"
+version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a0d197bd2c9dc6e53b84da9556a69ba4cdfab8619eb41a8bd1cc2027a0f6b1d"
+checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"

 [[package]]
 name = "ryu"
@@ -1191,14 +1206,14 @@ checksum = "5b0276cf7f2c73365f7157c8123c21cd9a50fbbd844757af28ca1f5925fc2a00"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 ]

 [[package]]
 name = "serde_json"
-version = "1.0.142"
+version = "1.0.143"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "030fedb782600dcbd6f02d479bf0d817ac3bb40d644745b769d6a96bc3afc5a7"
+checksum = "d401abef1d108fbd9cbaebc3e46611f4b1021f714a0597a71f41ee463f5f4a5a"
 dependencies = [
 "indexmap",
 "itoa",
@@ -1247,9 +1262,9 @@ checksum = "56199f7ddabf13fe5074ce809e7d3f42b42ae711800501b5b16ea82ad029c39d"

 [[package]]
 name = "slab"
-version = "0.4.10"
+version = "0.4.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04dc19736151f35336d325007ac991178d504a119863a2fcb3758cdb5e52c50d"
+checksum = "7a2ae44ef20feb57a68b23d846850f861394c2e02dc425a50098ae8c90267589"

 [[package]]
 name = "smallvec"
@@ -1327,7 +1342,7 @@ dependencies = [
 "proc-macro2",
 "quote",
 "rustversion",
- "syn 2.0.104",
+ "syn 2.0.106",
 ]

 [[package]]
@@ -1349,9 +1364,9 @@ dependencies = [

 [[package]]
 name = "syn"
-version = "2.0.104"
+version = "2.0.106"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17b6f705963418cdb9927482fa304bc562ece2fdd4f616084c50b7023b435a40"
+checksum = "ede7c438028d4436d71104916910f5bb611972c5cfd7f89b8300a8186e6fada6"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -1387,7 +1402,7 @@ checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 ]

 [[package]]
@@ -1401,9 +1416,9 @@ dependencies = [

 [[package]]
 name = "tinyvec"
-version = "1.9.0"
+version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09b3661f17e86524eccd4371ab0429194e0d7c008abb45f7a7495b1719463c71"
+checksum = "bfa5fdc3bce6191a1dbc8c02d5c8bffcf557bafa17c124c5264a458f1b0613fa"
 dependencies = [
 "tinyvec_macros",
 ]
@@ -1442,7 +1457,7 @@ checksum = "6e06d43f1345a3bcd39f6a56dbb7dcab2ba47e68e8ac134855e7e2bdbaf8cab8"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 ]

 [[package]]
@@ -1504,6 +1519,7 @@ dependencies = [
 [[package]]
 name = "tst"
 version = "0.1.0"
+source = "git+https://git.ourworld.tf/herocode/herolib_rust#aa0248ef17cb0117bb69f1d9f278f995bb417f16"
 dependencies = [
 "ourdb",
 "thiserror",
@@ -1550,9 +1566,9 @@ checksum = "6d49784317cd0d1ee7ec5c716dd598ec5b4483ea832a2dced265471cc0f690ae"

 [[package]]
 name = "uuid"
-version = "1.17.0"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3cf4199d1e5d15ddd86a694e4d0dffa9c323ce759fea589f00fef9d81cc1931d"
+checksum = "f33196643e165781c20a5ead5582283a7dacbb87855d867fbc2df3f81eddc1be"
 dependencies = [
 "getrandom 0.3.3",
 "js-sys",
@@ -1614,7 +1630,7 @@ dependencies = [
 "log",
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 "wasm-bindgen-shared",
 ]

@@ -1636,7 +1652,7 @@ checksum = "8ae87ea40c9f689fc23f209965b6fb8a99ad69aeeb0231408be24920604395de"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 "wasm-bindgen-backend",
 "wasm-bindgen-shared",
 ]
@@ -1662,11 +1678,11 @@ dependencies = [

 [[package]]
 name = "whoami"
-version = "1.6.0"
+version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6994d13118ab492c3c80c1f81928718159254c53c472bf9ce36f8dae4add02a7"
+checksum = "5d4a4db5077702ca3015d3d02d74974948aba2ad9e12ab7df718ee64ccd7e97d"
 dependencies = [
- "redox_syscall",
+ "libredox",
 "wasite",
 "web-sys",
 ]
@@ -1692,7 +1708,7 @@ checksum = "a47fddd13af08290e67f4acabf4b459f647552718f683a7b415d290ac744a836"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 ]

 [[package]]
@@ -1703,7 +1719,7 @@ checksum = "bd9211b69f8dcdfa817bfd14bf1c97c9188afa36f4750130fcdf3f400eca9fa8"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 ]

 [[package]]
@@ -1856,5 +1872,5 @@ checksum = "9ecf5b4cc5364572d7f4c329661bcc82724222973f2cab6f050a4e5c22f75181"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.104",
+ "syn 2.0.106",
 ]
--- a/heromodels-derive/Cargo.toml
+++ b/heromodels-derive/Cargo.toml
@@ -15,3 +15,5 @@ proc-macro2 = "1.0"

 [dev-dependencies]
 serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+heromodels_core = { path = "../heromodels_core" }
--- a/heromodels-derive/src/lib.rs
+++ b/heromodels-derive/src/lib.rs
@@ -1,6 +1,6 @@
 use proc_macro::TokenStream;
 use quote::{format_ident, quote};
-use syn::{Data, DeriveInput, Fields, parse_macro_input};
+use syn::{parse_macro_input, Data, DeriveInput, Fields, Lit, Meta, MetaList, MetaNameValue};

 /// Convert a string to snake_case
 fn to_snake_case(s: &str) -> String {
@@ -47,86 +47,165 @@ pub fn model(_attr: TokenStream, item: TokenStream) -> TokenStream {
    let db_prefix = to_snake_case(&name_str);

    // Extract fields with #[index] attribute
-    let mut indexed_fields = Vec::new();
-    let mut custom_index_names = std::collections::HashMap::new();
+    // Supports both top-level (no args) and nested path-based indexes declared on a field
+    #[derive(Clone)]
+    enum IndexDecl {
+        TopLevel {
+            field_ident: syn::Ident,
+            field_ty: syn::Type,
+        },
+        NestedPath {
+            on_field_ident: syn::Ident,
+            path: String, // dotted path relative to the field
+        },
+    }
+
+    let mut index_decls: Vec<IndexDecl> = Vec::new();

    if let Data::Struct(ref mut data_struct) = input.data {
        if let Fields::Named(ref mut fields_named) = data_struct.fields {
            for field in &mut fields_named.named {
-                let mut attr_idx = None;
+                let mut to_remove: Vec<usize> = Vec::new();
                for (i, attr) in field.attrs.iter().enumerate() {
-                    if attr.path().is_ident("index") {
-                        attr_idx = Some(i);
-                        if let Some(ref field_name) = field.ident {
-                            // Check if the attribute has parameters
-                            let mut custom_name = None;
+                    if !attr.path().is_ident("index") {
+                        continue;
+                    }
+                    to_remove.push(i);

-                            // Parse attribute arguments if any
-                            let meta = attr.meta.clone();
-                            if let syn::Meta::List(list) = meta {
-                                if let Ok(nested) = list.parse_args_with(syn::punctuated::Punctuated::<syn::Meta, syn::Token![,]>::parse_terminated) {
-                                        for meta in nested {
-                                            if let syn::Meta::NameValue(name_value) = meta {
-                                                if name_value.path.is_ident("name") {
-                                                    if let syn::Expr::Lit(syn::ExprLit { lit: syn::Lit::Str(lit_str), .. }) = name_value.value {
-                                                        custom_name = Some(lit_str.value());
-                                                    }
+                    if let Some(ref field_name) = field.ident {
+                        match &attr.meta {
+                            Meta::Path(_) => {
+                                // Simple top-level index on this field
+                                index_decls.push(IndexDecl::TopLevel {
+                                    field_ident: field_name.clone(),
+                                    field_ty: field.ty.clone(),
+                                });
+                            }
+                            Meta::List(MetaList { .. }) => {
+                                // Parse for path = "..."; name is assumed equal to path
+                                // We support syntax: #[index(path = "a.b.c")]
+                                if let Ok(nested) = attr.parse_args_with(
+                                    syn::punctuated::Punctuated::<Meta, syn::Token![,]>::parse_terminated,
+                                ) {
+                                    for meta in nested {
+                                        if let Meta::NameValue(MetaNameValue { path, value, .. }) = meta {
+                                            if path.is_ident("path") {
+                                                if let syn::Expr::Lit(syn::ExprLit { lit: Lit::Str(lit_str), .. }) = value {
+                                                    let p = lit_str.value();
+                                                    index_decls.push(IndexDecl::NestedPath {
+                                                        on_field_ident: field_name.clone(),
+                                                        path: p,
+                                                    });
                                                }
                                            }
                                        }
                                    }
+                                }
                            }
-
-                            indexed_fields.push((field_name.clone(), field.ty.clone()));
-
-                            if let Some(name) = custom_name {
-                                custom_index_names.insert(field_name.to_string(), name);
-                            }
+                            _ => {}
                        }
                    }
                }

-                if let Some(idx) = attr_idx {
+                // remove all #[index] attributes we processed
+                // remove from the back to keep indices valid
+                to_remove.sort_unstable();
+                to_remove.drain(..).rev().for_each(|idx| {
                    field.attrs.remove(idx);
-                }
+                });
            }
        }
    }

    // Generate Model trait implementation
-    let db_keys_impl = if indexed_fields.is_empty() {
+    let db_keys_impl = if index_decls.is_empty() {
        quote! {
            fn db_keys(&self) -> Vec<heromodels_core::IndexKey> {
                Vec::new()
            }
        }
    } else {
-        let field_keys = indexed_fields.iter().map(|(field_name, _)| {
-            let name_str = custom_index_names
-                .get(&field_name.to_string())
-                .cloned()
-                .unwrap_or(field_name.to_string());
-            quote! {
-                heromodels_core::IndexKey {
-                    name: #name_str,
-                    value: self.#field_name.to_string(),
+        // Build code for keys from each index declaration
+        let mut key_snippets: Vec<proc_macro2::TokenStream> = Vec::new();
+
+        for decl in &index_decls {
+            match decl.clone() {
+                IndexDecl::TopLevel { field_ident, .. } => {
+                    let name_str = field_ident.to_string();
+                    key_snippets.push(quote! {
+                        keys.push(heromodels_core::IndexKey {
+                            name: #name_str,
+                            value: self.#field_ident.to_string(),
+                        });
+                    });
+                }
+                IndexDecl::NestedPath { on_field_ident, path } => {
+                    // Name is equal to provided path
+                    let name_str = path.clone();
+                    // Generate traversal code using serde_json to support arrays and objects generically
+                    // Split the path into static segs for iteration
+                    let segs: Vec<String> = path.split('.').map(|s| s.to_string()).collect();
+                    let segs_iter = segs.iter().map(|s| s.as_str());
+                    let segs_array = quote! { [ #( #segs_iter ),* ] };
+
+                    key_snippets.push(quote! {
+                        // Serialize the target field to JSON for generic traversal
+                        let __hm_json_val = ::serde_json::to_value(&self.#on_field_ident).unwrap_or(::serde_json::Value::Null);
+                        let mut __hm_stack: Vec<&::serde_json::Value> = vec![&__hm_json_val];
+                        for __hm_seg in #segs_array.iter() {
+                            let mut __hm_next: Vec<&::serde_json::Value> = Vec::new();
+                            for __hm_v in &__hm_stack {
+                                match __hm_v {
+                                    ::serde_json::Value::Array(arr) => {
+                                        for __hm_e in arr {
+                                            if let ::serde_json::Value::Object(map) = __hm_e {
+                                                if let Some(x) = map.get(*__hm_seg) { __hm_next.push(x); }
+                                            }
+                                        }
+                                    }
+                                    ::serde_json::Value::Object(map) => {
+                                        if let Some(x) = map.get(*__hm_seg) { __hm_next.push(x); }
+                                    }
+                                    _ => {}
+                                }
+                            }
+                            __hm_stack = __hm_next;
+                            if __hm_stack.is_empty() { break; }
+                        }
+                        for __hm_leaf in __hm_stack {
+                            match __hm_leaf {
+                                ::serde_json::Value::Null => {},
+                                ::serde_json::Value::Array(_) => {},
+                                ::serde_json::Value::Object(_) => {},
+                                other => {
+                                    // Convert primitives to string without surrounding quotes for strings
+                                    let mut s = other.to_string();
+                                    if let ::serde_json::Value::String(_) = other { s = s.trim_matches('"').to_string(); }
+                                    keys.push(heromodels_core::IndexKey { name: #name_str, value: s });
+                                }
+                            }
+                        }
+                    });
                }
            }
-        });
+        }

        quote! {
            fn db_keys(&self) -> Vec<heromodels_core::IndexKey> {
-                vec![
-                    #(#field_keys),*
-                ]
+                let mut keys: Vec<heromodels_core::IndexKey> = Vec::new();
+                #(#key_snippets)*
+                keys
            }
        }
    };

-    let indexed_field_names = indexed_fields
+    let indexed_field_names: Vec<String> = index_decls
        .iter()
-        .map(|f| f.0.to_string())
-        .collect::<Vec<_>>();
+        .map(|d| match d {
+            IndexDecl::TopLevel { field_ident, .. } => field_ident.to_string(),
+            IndexDecl::NestedPath { path, .. } => path.clone(),
+        })
+        .collect();

    let model_impl = quote! {
        impl heromodels_core::Model for #struct_name {
@@ -152,51 +231,33 @@ pub fn model(_attr: TokenStream, item: TokenStream) -> TokenStream {
        }
    };

-    // Generate Index trait implementations
+    // Generate Index trait implementations only for top-level fields, keep existing behavior
    let mut index_impls = proc_macro2::TokenStream::new();
+    for decl in &index_decls {
+        if let IndexDecl::TopLevel { field_ident, field_ty } = decl {
+            let name_str = field_ident.to_string();
+            let index_struct_name = format_ident!("{}", &name_str);
+            let field_type = field_ty.clone();

-    for (field_name, field_type) in &indexed_fields {
-        let name_str = field_name.to_string();
+            let index_impl = quote! {
+                pub struct #index_struct_name;

-        // Get custom index name if specified, otherwise use field name
-        let index_key = match custom_index_names.get(&name_str) {
-            Some(custom_name) => custom_name.clone(),
-            None => name_str.clone(),
-        };
+                impl heromodels_core::Index for #index_struct_name {
+                    type Model = super::#struct_name;
+                    type Key = #field_type;

-        // Convert field name to PascalCase for struct name
-        // let struct_name_str = to_pascal_case(&name_str);
-        // let index_struct_name = format_ident!("{}", struct_name_str);
-        let index_struct_name = format_ident!("{}", &name_str);
+                    fn key() -> &'static str { #name_str }

-        // Default to str for key type
-        let index_impl = quote! {
-            pub struct #index_struct_name;
-
-            impl heromodels_core::Index for #index_struct_name {
-                type Model = super::#struct_name;
-                type Key = #field_type;
-
-                fn key() -> &'static str {
-                    #index_key
+                    fn field_name() -> &'static str { #name_str }
                }
-
-                fn field_name() -> &'static str {
-                    #name_str
-                }
-            }
-        };
-
-        index_impls.extend(index_impl);
+            };
+            index_impls.extend(index_impl);
+        }
    }

    if !index_impls.is_empty() {
        let index_mod_name = format_ident!("{}_index", db_prefix);
-        index_impls = quote! {
-            pub mod #index_mod_name {
-                #index_impls
-            }
-        }
+        index_impls = quote! { pub mod #index_mod_name { #index_impls } };
    }

    // Combine the original struct with the generated implementations
--- a/heromodels-derive/tests/test_model_macro.rs
+++ b/heromodels-derive/tests/test_model_macro.rs
@@ -1,7 +1,38 @@
 use heromodels_derive::model;
 use serde::{Deserialize, Serialize};

-// Define the necessary structs and traits for testing
+// Make the current crate visible as an extern crate named `heromodels_core`
+extern crate self as heromodels_core;
+extern crate serde_json; // ensure ::serde_json path resolves
+
+// Mock the heromodels_core API at crate root (visible via the alias above)
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct IndexKey {
+    pub name: &'static str,
+    pub value: String,
+}
+
+pub trait Model: std::fmt::Debug + Clone + Serialize + for<'de> Deserialize<'de> + Send + Sync + 'static {
+    fn db_prefix() -> &'static str
+    where
+        Self: Sized;
+    fn get_id(&self) -> u32;
+    fn base_data_mut(&mut self) -> &mut BaseModelData;
+    fn db_keys(&self) -> Vec<IndexKey> {
+        Vec::new()
+    }
+    fn indexed_fields() -> Vec<&'static str> {
+        Vec::new()
+    }
+}
+
+pub trait Index {
+    type Model: Model;
+    type Key: ToString + ?Sized;
+    fn key() -> &'static str;
+    fn field_name() -> &'static str;
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct BaseModelData {
    pub id: u32,
@@ -11,41 +42,18 @@ pub struct BaseModelData {
 }

 impl BaseModelData {
-    pub fn new(id: u32) -> Self {
-        let now = 1000; // Mock timestamp
-        Self {
-            id,
-            created_at: now,
-            modified_at: now,
-            comments: Vec::new(),
-        }
+    pub fn new() -> Self {
+        let now = 1000;
+        Self { id: 0, created_at: now, modified_at: now, comments: Vec::new() }
    }
+    pub fn update_modified(&mut self) { self.modified_at += 1; }
 }

-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct IndexKey {
-    pub name: &'static str,
-    pub value: String,
-}
-
-pub trait Model: std::fmt::Debug + Clone {
-    fn db_prefix() -> &'static str;
-    fn get_id(&self) -> u32;
-    fn base_data_mut(&mut self) -> &mut BaseModelData;
-    fn db_keys(&self) -> Vec<IndexKey>;
-}
-
-pub trait Index {
-    type Model: Model;
-    type Key: ?Sized;
-    fn key() -> &'static str;
-}
-
-// Test struct using the model macro
+// Top-level field index tests
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[model]
-struct TestUser {
-    base_data: BaseModelData,
+pub struct TestUser {
+    base_data: heromodels_core::BaseModelData,

    #[index]
    username: String,
@@ -54,25 +62,12 @@ struct TestUser {
    is_active: bool,
 }

-// Test struct with custom index name
-#[derive(Debug, Clone, Serialize, Deserialize)]
-#[model]
-struct TestUserWithCustomIndex {
-    base_data: BaseModelData,
-
-    #[index(name = "custom_username")]
-    username: String,
-
-    #[index]
-    is_active: bool,
-}
-
 #[test]
 fn test_basic_model() {
    assert_eq!(TestUser::db_prefix(), "test_user");

    let user = TestUser {
-        base_data: BaseModelData::new(1),
+        base_data: heromodels_core::BaseModelData::new(),
        username: "test".to_string(),
        is_active: true,
    };
@@ -85,22 +80,47 @@ fn test_basic_model() {
    assert_eq!(keys[1].value, "true");
 }

+// Nested path index tests (including vector traversal)
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+struct GPU { gpu_brand: String }
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+struct CPU { cpu_brand: String }
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+struct DeviceInfo { vendor: String, cpu: Vec<CPU>, gpu: Vec<GPU> }
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[model]
+pub struct NodeLike {
+    base_data: heromodels_core::BaseModelData,
+
+    #[index(path = "vendor")]
+    #[index(path = "cpu.cpu_brand")]
+    #[index(path = "gpu.gpu_brand")]
+    devices: DeviceInfo,
+}
+
 #[test]
-fn test_custom_index_name() {
-    let user = TestUserWithCustomIndex {
-        base_data: BaseModelData::new(1),
-        username: "test".to_string(),
-        is_active: true,
+fn test_nested_indexes() {
+    let n = NodeLike {
+        base_data: heromodels_core::BaseModelData::new(),
+        devices: DeviceInfo {
+            vendor: "SuperVendor".to_string(),
+            cpu: vec![CPU { cpu_brand: "Intel".into() }, CPU { cpu_brand: "AMD".into() }],
+            gpu: vec![GPU { gpu_brand: "NVIDIA".into() }, GPU { gpu_brand: "AMD".into() }],
+        },
    };

-    // Check that the Username struct uses the custom index name
-    assert_eq!(Username::key(), "custom_username");
+    let mut keys = n.db_keys();
+    // Sort for deterministic assertions
+    keys.sort_by(|a,b| a.name.cmp(b.name).then(a.value.cmp(&b.value)));

-    // Check that the db_keys method returns the correct keys
-    let keys = user.db_keys();
-    assert_eq!(keys.len(), 2);
-    assert_eq!(keys[0].name, "custom_username");
-    assert_eq!(keys[0].value, "test");
-    assert_eq!(keys[1].name, "is_active");
-    assert_eq!(keys[1].value, "true");
+    // Expect 1 (vendor) + 2 (cpu brands) + 2 (gpu brands) = 5 keys
+    assert_eq!(keys.len(), 5);
+    assert!(keys.iter().any(|k| k.name == "vendor" && k.value == "SuperVendor"));
+    assert!(keys.iter().any(|k| k.name == "cpu.cpu_brand" && k.value == "Intel"));
+    assert!(keys.iter().any(|k| k.name == "cpu.cpu_brand" && k.value == "AMD"));
+    assert!(keys.iter().any(|k| k.name == "gpu.gpu_brand" && k.value == "NVIDIA"));
+    assert!(keys.iter().any(|k| k.name == "gpu.gpu_brand" && k.value == "AMD"));
 }
--- a/heromodels/Cargo.lock
+++ b/heromodels/Cargo.lock
--- a/heromodels/Cargo.toml
+++ b/heromodels/Cargo.toml
@@ -10,11 +10,11 @@ serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 bincode = { version = "2", features = ["serde"] }
 chrono = { version = "0.4", features = ["serde"] }
-ourdb = { path = "../../herolib_rust/packages/data/ourdb" }
-tst = { path = "../../herolib_rust/packages/data/tst" }
+ourdb = { git = "https://git.ourworld.tf/herocode/herolib_rust", package = "ourdb" }
+tst = { git = "https://git.ourworld.tf/herocode/herolib_rust", package = "tst" }
 heromodels-derive = { path = "../heromodels-derive" }
 heromodels_core = { path = "../heromodels_core" }
-rhailib-macros = { path = "../../herolib_rust/rhailib/src/macros" }
+rhailib-macros = { git = "https://git.ourworld.tf/herocode/herolib_rust", package = "rhailib-macros" }
 rhai = { version = "1.21.0", features = [
  "std",
  "sync",
@@ -53,11 +53,19 @@ path = "examples/finance_example/main.rs"
 name = "flow_example"
 path = "examples/flow_example.rs"

-[[example]]
-name = "biz_rhai"
-path = "examples/biz_rhai/example.rs"
-required-features = ["rhai"]
+# [[example]]
+# name = "biz_rhai"
+# path = "examples/biz_rhai/example.rs"
+# required-features = ["rhai"]

 [[example]]
 name = "postgres_model_example"
 path = "examples/postgres_example/example.rs"
+
+[[example]]
+name = "heroledger_example"
+path = "examples/heroledger_example/example.rs"
+
+[[example]]
+name = "grid4_example"
+path = "examples/grid4_example/example.rs"
--- a/heromodels/examples/calendar_example/main.rs
+++ b/heromodels/examples/calendar_example/main.rs
@@ -1,10 +1,25 @@
-use chrono::{Duration, Utc};
+use chrono::{Duration, Utc, NaiveDateTime};
 use heromodels::db::{Collection, Db};
 use heromodels::models::User;
 use heromodels::models::calendar::{AttendanceStatus, Attendee, Calendar, Event, EventStatus};
 use heromodels_core::Model;

 fn main() {
+    // Helper to format i64 timestamps
+    let fmt_time = |ts: i64| -> String {
+        let ndt = NaiveDateTime::from_timestamp_opt(ts, 0)
+            .unwrap_or(NaiveDateTime::from_timestamp_opt(0, 0).unwrap());
+        chrono::DateTime::<Utc>::from_utc(ndt, Utc)
+            .format("%Y-%m-%d %H:%M")
+            .to_string()
+    };
+    let fmt_date = |ts: i64| -> String {
+        let ndt = NaiveDateTime::from_timestamp_opt(ts, 0)
+            .unwrap_or(NaiveDateTime::from_timestamp_opt(0, 0).unwrap());
+        chrono::DateTime::<Utc>::from_utc(ndt, Utc)
+            .format("%Y-%m-%d")
+            .to_string()
+    };
    // Create a new DB instance, reset before every run
    let db_path = "/tmp/ourdb_calendar_example";
    let db = heromodels::db::hero::OurDB::new(db_path, true).expect("Can create DB");
@@ -47,50 +62,21 @@ fn main() {
    println!("- User 2 (ID: {}): {}", user2_id, stored_user2.full_name);
    println!("- User 3 (ID: {}): {}", user3_id, stored_user3.full_name);

-    // --- Create Attendees ---
+    // --- Create Attendees (embedded in events, not stored separately) ---
    println!("\n--- Creating Attendees ---");
    let attendee1 = Attendee::new(user1_id).status(AttendanceStatus::Accepted);
    let attendee2 = Attendee::new(user2_id).status(AttendanceStatus::Tentative);
    let attendee3 = Attendee::new(user3_id); // Default NoResponse

-    // Store attendees in database and get their IDs
-    let attendee_collection = db
-        .collection::<Attendee>()
-        .expect("can open attendee collection");
-
-    let (attendee1_id, stored_attendee1) = attendee_collection
-        .set(&attendee1)
-        .expect("can set attendee1");
-    let (attendee2_id, stored_attendee2) = attendee_collection
-        .set(&attendee2)
-        .expect("can set attendee2");
-    let (attendee3_id, stored_attendee3) = attendee_collection
-        .set(&attendee3)
-        .expect("can set attendee3");
-
-    println!("Created attendees:");
-    println!(
-        "- Attendee 1 (ID: {}): Contact ID {}, Status: {:?}",
-        attendee1_id, stored_attendee1.contact_id, stored_attendee1.status
-    );
-    println!(
-        "- Attendee 2 (ID: {}): Contact ID {}, Status: {:?}",
-        attendee2_id, stored_attendee2.contact_id, stored_attendee2.status
-    );
-    println!(
-        "- Attendee 3 (ID: {}): Contact ID {}, Status: {:?}",
-        attendee3_id, stored_attendee3.contact_id, stored_attendee3.status
-    );
-
    // --- Create Events with Attendees ---
    println!("\n--- Creating Events with Enhanced Features ---");
    let now = Utc::now();
+    let event1_start = (now + Duration::hours(1)).timestamp();
+    let event1_end = (now + Duration::hours(2)).timestamp();

-    let event1 = Event::new(
-        "Team Meeting",
-        now + Duration::hours(1),
-        now + Duration::hours(2),
-    )
+    let event1 = Event::new()
+    .title("Team Meeting")
+    .reschedule(event1_start, event1_end)
    .description("Weekly sync-up meeting to discuss project progress.")
    .location("Conference Room A")
    .color("#FF5722") // Red-orange color
@@ -99,14 +85,14 @@ fn main() {
    .category("Work")
    .reminder_minutes(15)
    .timezone("UTC")
-    .add_attendee(attendee1_id)
-    .add_attendee(attendee2_id);
+    .add_attendee(attendee1.clone())
+    .add_attendee(attendee2.clone());

-    let event2 = Event::new(
-        "Project Brainstorm",
-        now + Duration::days(1),
-        now + Duration::days(1) + Duration::minutes(90),
-    )
+    let event2_start = (now + Duration::days(1)).timestamp();
+    let event2_end = (now + Duration::days(1) + Duration::minutes(90)).timestamp();
+    let event2 = Event::new()
+    .title("Project Brainstorm")
+    .reschedule(event2_start, event2_end)
    .description("Brainstorming session for new project features.")
    .location("Innovation Lab")
    .color("#4CAF50") // Green color
@@ -115,28 +101,28 @@ fn main() {
    .category("Planning")
    .reminder_minutes(30)
    .is_recurring(true)
-    .add_attendee(attendee1_id)
-    .add_attendee(attendee3_id);
+    .add_attendee(attendee1.clone())
+    .add_attendee(attendee3.clone());

-    let event3 = Event::new(
-        "Client Call",
-        now + Duration::days(2),
-        now + Duration::days(2) + Duration::hours(1),
-    )
+    let event3_start = (now + Duration::days(2)).timestamp();
+    let event3_end = (now + Duration::days(2) + Duration::hours(1)).timestamp();
+    let event3 = Event::new()
+    .title("Client Call")
+    .reschedule(event3_start, event3_end)
    .description("Quarterly review with key client.")
    .color("#9C27B0") // Purple color
    .created_by(user3_id)
    .status(EventStatus::Published)
    .category("Client")
    .reminder_minutes(60)
-    .add_attendee(attendee2_id);
+    .add_attendee(attendee2.clone());

    // Create an all-day event
-    let event4 = Event::new(
-        "Company Holiday",
-        now + Duration::days(7),
-        now + Duration::days(7) + Duration::hours(24),
-    )
+    let event4_start = (now + Duration::days(7)).timestamp();
+    let event4_end = (now + Duration::days(7) + Duration::hours(24)).timestamp();
+    let event4 = Event::new()
+    .title("Company Holiday")
+    .reschedule(event4_start, event4_end)
    .description("National holiday - office closed.")
    .color("#FFC107") // Amber color
    .all_day(true)
@@ -148,7 +134,7 @@ fn main() {
    println!(
        "- Event 1: '{}' at {} with {} attendees",
        event1.title,
-        event1.start_time.format("%Y-%m-%d %H:%M"),
+        fmt_time(event1.start_time),
        event1.attendees.len()
    );
    println!(
@@ -174,12 +160,19 @@ fn main() {
    );
    println!("  All-day: {}", event1.all_day);
    println!("  Recurring: {}", event1.is_recurring);
-    println!("  Attendee IDs: {:?}", event1.attendees);
+    println!(
+        "  Attendee IDs: {:?}",
+        event1
+            .attendees
+            .iter()
+            .map(|a| a.contact_id)
+            .collect::<Vec<u32>>()
+    );

    println!(
        "- Event 2: '{}' at {} with {} attendees",
        event2.title,
-        event2.start_time.format("%Y-%m-%d %H:%M"),
+        fmt_time(event2.start_time),
        event2.attendees.len()
    );
    println!(
@@ -205,12 +198,19 @@ fn main() {
    );
    println!("  All-day: {}", event2.all_day);
    println!("  Recurring: {}", event2.is_recurring);
-    println!("  Attendee IDs: {:?}", event2.attendees);
+    println!(
+        "  Attendee IDs: {:?}",
+        event2
+            .attendees
+            .iter()
+            .map(|a| a.contact_id)
+            .collect::<Vec<u32>>()
+    );

    println!(
        "- Event 3: '{}' at {} with {} attendees",
        event3.title,
-        event3.start_time.format("%Y-%m-%d %H:%M"),
+        fmt_time(event3.start_time),
        event3.attendees.len()
    );
    println!(
@@ -236,12 +236,19 @@ fn main() {
    );
    println!("  All-day: {}", event3.all_day);
    println!("  Recurring: {}", event3.is_recurring);
-    println!("  Attendee IDs: {:?}", event3.attendees);
+    println!(
+        "  Attendee IDs: {:?}",
+        event3
+            .attendees
+            .iter()
+            .map(|a| a.contact_id)
+            .collect::<Vec<u32>>()
+    );

    println!(
        "- Event 4: '{}' at {} (All-day: {})",
        event4.title,
-        event4.start_time.format("%Y-%m-%d"),
+        fmt_date(event4.start_time),
        event4.all_day
    );
    println!(
@@ -262,25 +269,37 @@ fn main() {
    let new_start = now + Duration::hours(2);
    let new_end = now + Duration::hours(3);
    let mut updated_event1 = event1.clone();
-    updated_event1 = updated_event1.reschedule(new_start, new_end);
+    updated_event1 = updated_event1.reschedule(new_start.timestamp(), new_end.timestamp());
    println!(
        "Rescheduled '{}' to {}",
        updated_event1.title,
-        new_start.format("%Y-%m-%d %H:%M")
+        fmt_time(new_start.timestamp())
    );

    // Remove an attendee
-    updated_event1 = updated_event1.remove_attendee(attendee1_id);
+    updated_event1 = updated_event1.remove_attendee(user1_id);
    println!(
        "Removed attendee {} from '{}'. Remaining attendee IDs: {:?}",
-        attendee1_id, updated_event1.title, updated_event1.attendees
+        user1_id,
+        updated_event1.title,
+        updated_event1
+            .attendees
+            .iter()
+            .map(|a| a.contact_id)
+            .collect::<Vec<u32>>()
    );

    // Add a new attendee
-    updated_event1 = updated_event1.add_attendee(attendee3_id);
+    updated_event1 = updated_event1.add_attendee(attendee3.clone());
    println!(
        "Added attendee {} to '{}'. Current attendee IDs: {:?}",
-        attendee3_id, updated_event1.title, updated_event1.attendees
+        user3_id,
+        updated_event1.title,
+        updated_event1
+            .attendees
+            .iter()
+            .map(|a| a.contact_id)
+            .collect::<Vec<u32>>()
    );

    // --- Demonstrate Event Status Changes ---
@@ -300,11 +319,11 @@ fn main() {
    println!("Cancelled event: '{}'", cancelled_event.title);

    // Update event with new features
-    let enhanced_event = Event::new(
-        "Enhanced Meeting",
-        now + Duration::days(5),
-        now + Duration::days(5) + Duration::hours(2),
-    )
+    let enhanced_start = (now + Duration::days(5)).timestamp();
+    let enhanced_end = (now + Duration::days(5) + Duration::hours(2)).timestamp();
+    let enhanced_event = Event::new()
+    .title("Enhanced Meeting")
+    .reschedule(enhanced_start, enhanced_end)
    .description("Meeting with all new features demonstrated.")
    .location("Virtual - Zoom")
    .color("#673AB7") // Deep purple
@@ -314,9 +333,9 @@ fn main() {
    .reminder_minutes(45)
    .timezone("America/New_York")
    .is_recurring(true)
-    .add_attendee(attendee1_id)
-    .add_attendee(attendee2_id)
-    .add_attendee(attendee3_id);
+    .add_attendee(attendee1)
+    .add_attendee(attendee2)
+    .add_attendee(attendee3);

    println!("Created enhanced event with all features:");
    println!("  Title: {}", enhanced_event.title);
@@ -485,13 +504,13 @@ fn main() {
    println!("\n--- Modifying Calendar ---");

    // Create and store a new event
-    let new_event = Event::new(
-        "1-on-1 Meeting",
-        now + Duration::days(3),
-        now + Duration::days(3) + Duration::minutes(30),
-    )
-    .description("One-on-one meeting with team member.")
-    .location("Office");
+    let ne_start = (now + Duration::days(3)).timestamp();
+    let ne_end = (now + Duration::days(3) + Duration::minutes(30)).timestamp();
+    let new_event = Event::new()
+        .title("1-on-1 Meeting")
+        .reschedule(ne_start, ne_end)
+        .description("One-on-one meeting with team member.")
+        .location("Office");

    let (new_event_id, _stored_new_event) =
        event_collection.set(&new_event).expect("can set new event");
@@ -565,7 +584,7 @@ fn main() {
            "- Event ID: {}, Title: '{}', Start: {}, Attendees: {}",
            event.get_id(),
            event.title,
-            event.start_time.format("%Y-%m-%d %H:%M"),
+            fmt_time(event.start_time),
            event.attendees.len()
        );
    }
@@ -583,22 +602,16 @@ fn main() {
            retrieved_event1.attendees.len()
        );

-        // Look up attendee details for each attendee ID
-        for &attendee_id in &retrieved_event1.attendees {
-            if let Some(attendee) = attendee_collection
-                .get_by_id(attendee_id)
-                .expect("can try to get attendee")
+        // Look up attendee details directly from embedded attendees
+        for attendee in &retrieved_event1.attendees {
+            if let Some(user) = user_collection
+                .get_by_id(attendee.contact_id)
+                .expect("can try to get user")
            {
-                // Look up user details for the attendee's contact_id
-                if let Some(user) = user_collection
-                    .get_by_id(attendee.contact_id)
-                    .expect("can try to get user")
-                {
-                    println!(
-                        "  - Attendee ID {}: {} (User: {}, Status: {:?})",
-                        attendee_id, user.full_name, attendee.contact_id, attendee.status
-                    );
-                }
+                println!(
+                    "  - User {}: {} (Status: {:?})",
+                    attendee.contact_id, user.full_name, attendee.status
+                );
            }
        }
    }
--- a/heromodels/examples/circle_launcher_example.rs
+++ b/heromodels/examples/circle_launcher_example.rs
@@ -1,7 +1,7 @@
-use circles_launcher::{new_launcher};
-use heromodels::models::circle::circle::{new_circle};
-use secp256k1::{Secp256k1, SecretKey, PublicKey};
+use circles_launcher::new_launcher;
+use heromodels::models::circle::circle::new_circle;
 use rand::rngs::OsRng;
+use secp256k1::{PublicKey, Secp256k1, SecretKey};

 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
--- a/heromodels/examples/grid4_bid_example.rs
+++ b/heromodels/examples/grid4_bid_example.rs
@@ -0,0 +1,199 @@
+use heromodels::db::{Collection, Db};
+use heromodels::models::grid4::{Bid, BidStatus, BillingPeriod};
+use heromodels::models::grid4::bid::bid_index::customer_id;
+use heromodels_core::Model;
+
+// Helper function to print bid details
+fn print_bid_details(bid: &Bid) {
+    println!("\n--- Bid Details ---");
+    println!("ID: {}", bid.get_id());
+    println!("Customer ID: {}", bid.customer_id);
+    println!("Compute Slices: {}", bid.compute_slices_nr);
+    println!("Compute Slice Price: ${:.2}", bid.compute_slice_price);
+    println!("Storage Slices: {}", bid.storage_slices_nr);
+    println!("Storage Slice Price: ${:.2}", bid.storage_slice_price);
+    println!("Status: {:?}", bid.status);
+    println!("Obligation: {}", bid.obligation);
+    println!("Start Date: {}", bid.start_date);
+    println!("End Date: {}", bid.end_date);
+    println!("Billing Period: {:?}", bid.billing_period);
+    println!("Signature User: {}", bid.signature_user);
+    println!("Created At: {}", bid.base_data.created_at);
+    println!("Modified At: {}", bid.base_data.modified_at);
+}
+
+fn main() {
+    // Create a new DB instance in /tmp/grid4_db, and reset before every run
+    let db = heromodels::db::hero::OurDB::new("/tmp/grid4_db", true).expect("Can create DB");
+
+    println!("Grid4 Bid Models - Basic Usage Example");
+    println!("=====================================");
+
+    // Create bids with different configurations
+
+    // Bid 1 - Small compute request
+    let bid1 = Bid::new()
+        .customer_id(101)
+        .compute_slices_nr(4)
+        .compute_slice_price(0.05)
+        .storage_slices_nr(10)
+        .storage_slice_price(0.02)
+        .status(BidStatus::Pending)
+        .obligation(false)
+        .start_date(1640995200) // 2022-01-01
+        .end_date(1672531200)   // 2023-01-01
+        .billing_period(BillingPeriod::Monthly)
+        .signature_user("sig_user_101_abc123".to_string());
+
+    // Bid 2 - Large compute request with obligation
+    let bid2 = Bid::new()
+        .customer_id(102)
+        .compute_slices_nr(16)
+        .compute_slice_price(0.04)
+        .storage_slices_nr(50)
+        .storage_slice_price(0.015)
+        .status(BidStatus::Confirmed)
+        .obligation(true)
+        .start_date(1640995200)
+        .end_date(1704067200)   // 2024-01-01
+        .billing_period(BillingPeriod::Yearly)
+        .signature_user("sig_user_102_def456".to_string());
+
+    // Bid 3 - Storage-heavy request
+    let bid3 = Bid::new()
+        .customer_id(103)
+        .compute_slices_nr(2)
+        .compute_slice_price(0.06)
+        .storage_slices_nr(100)
+        .storage_slice_price(0.01)
+        .status(BidStatus::Assigned)
+        .obligation(true)
+        .start_date(1640995200)
+        .end_date(1672531200)
+        .billing_period(BillingPeriod::Hourly)
+        .signature_user("sig_user_103_ghi789".to_string());
+
+    // Bid 4 - Cancelled bid
+    let bid4 = Bid::new()
+        .customer_id(104)
+        .compute_slices_nr(8)
+        .compute_slice_price(0.055)
+        .storage_slices_nr(25)
+        .storage_slice_price(0.018)
+        .status(BidStatus::Cancelled)
+        .obligation(false)
+        .start_date(1640995200)
+        .end_date(1672531200)
+        .billing_period(BillingPeriod::Monthly)
+        .signature_user("sig_user_104_jkl012".to_string());
+
+    // Save all bids to database and get their assigned IDs and updated models
+    let (bid1_id, db_bid1) = db
+        .collection()
+        .expect("can open bid collection")
+        .set(&bid1)
+        .expect("can set bid");
+    let (bid2_id, db_bid2) = db
+        .collection()
+        .expect("can open bid collection")
+        .set(&bid2)
+        .expect("can set bid");
+    let (bid3_id, db_bid3) = db
+        .collection()
+        .expect("can open bid collection")
+        .set(&bid3)
+        .expect("can set bid");
+    let (bid4_id, db_bid4) = db
+        .collection()
+        .expect("can open bid collection")
+        .set(&bid4)
+        .expect("can set bid");
+
+    println!("Bid 1 assigned ID: {}", bid1_id);
+    println!("Bid 2 assigned ID: {}", bid2_id);
+    println!("Bid 3 assigned ID: {}", bid3_id);
+    println!("Bid 4 assigned ID: {}", bid4_id);
+
+    // Print all bids retrieved from database
+    println!("\n--- Bids Retrieved from Database ---");
+    println!("\n1. Small compute bid:");
+    print_bid_details(&db_bid1);
+
+    println!("\n2. Large compute bid with obligation:");
+    print_bid_details(&db_bid2);
+
+    println!("\n3. Storage-heavy bid:");
+    print_bid_details(&db_bid3);
+
+    println!("\n4. Cancelled bid:");
+    print_bid_details(&db_bid4);
+
+    // Demonstrate different ways to retrieve bids from the database
+    println!("\n--- Retrieving Bids by Different Methods ---");
+    println!("\n1. By Customer ID Index (Customer 102):");
+    
+    let customer_bids = db
+        .collection::<Bid>()
+        .expect("can open bid collection")
+        .get::<customer_id, _>(&102u32)
+        .expect("can load bids by customer");
+
+    assert_eq!(customer_bids.len(), 1);
+    print_bid_details(&customer_bids[0]);
+
+    println!("\n2. Updating Bid Status:");
+    let mut updated_bid = db_bid1.clone();
+    updated_bid.status = BidStatus::Confirmed;
+
+    let (_, confirmed_bid) = db
+        .collection::<Bid>()
+        .expect("can open bid collection")
+        .set(&updated_bid)
+        .expect("can update bid");
+
+    println!("Updated bid status to Confirmed:");
+    print_bid_details(&confirmed_bid);
+
+    // 3. Delete a bid and show the updated results
+    println!("\n3. After Deleting a Bid:");
+    println!("Deleting bid with ID: {}", bid4_id);
+    db.collection::<Bid>()
+        .expect("can open bid collection")
+        .delete_by_id(bid4_id)
+        .expect("can delete existing bid");
+
+    // Show remaining bids
+    let all_bids = db
+        .collection::<Bid>()
+        .expect("can open bid collection")
+        .get_all()
+        .expect("can load all bids");
+
+    println!("Remaining bids count: {}", all_bids.len());
+    assert_eq!(all_bids.len(), 3);
+
+    // Calculate total compute and storage requested
+    println!("\n--- Bid Analytics ---");
+    let total_compute_slices: i32 = all_bids.iter().map(|b| b.compute_slices_nr).sum();
+    let total_storage_slices: i32 = all_bids.iter().map(|b| b.storage_slices_nr).sum();
+    let avg_compute_price: f64 = all_bids.iter().map(|b| b.compute_slice_price).sum::<f64>() / all_bids.len() as f64;
+    let avg_storage_price: f64 = all_bids.iter().map(|b| b.storage_slice_price).sum::<f64>() / all_bids.len() as f64;
+
+    println!("Total Compute Slices Requested: {}", total_compute_slices);
+    println!("Total Storage Slices Requested: {}", total_storage_slices);
+    println!("Average Compute Price: ${:.3}", avg_compute_price);
+    println!("Average Storage Price: ${:.3}", avg_storage_price);
+
+    // Count bids by status
+    let confirmed_count = all_bids.iter().filter(|b| matches!(b.status, BidStatus::Confirmed)).count();
+    let assigned_count = all_bids.iter().filter(|b| matches!(b.status, BidStatus::Assigned)).count();
+    let pending_count = all_bids.iter().filter(|b| matches!(b.status, BidStatus::Pending)).count();
+
+    println!("\nBids by Status:");
+    println!("  Confirmed: {}", confirmed_count);
+    println!("  Assigned: {}", assigned_count);
+    println!("  Pending: {}", pending_count);
+
+    println!("\n--- Model Information ---");
+    println!("Bid DB Prefix: {}", Bid::db_prefix());
+}
--- a/heromodels/examples/grid4_contract_example.rs
+++ b/heromodels/examples/grid4_contract_example.rs
@@ -0,0 +1,301 @@
+use heromodels::db::{Collection, Db};
+use heromodels::models::grid4::{Contract, ContractStatus};
+use heromodels::models::grid4::contract::contract_index::customer_id;
+use heromodels_core::Model;
+
+// Helper function to print contract details
+fn print_contract_details(contract: &Contract) {
+    println!("\n--- Contract Details ---");
+    println!("ID: {}", contract.get_id());
+    println!("Customer ID: {}", contract.customer_id);
+    println!("Compute Slices: {}", contract.compute_slices.len());
+    println!("Storage Slices: {}", contract.storage_slices.len());
+    println!("Compute Slice Price: ${:.2}", contract.compute_slice_price);
+    println!("Storage Slice Price: ${:.2}", contract.storage_slice_price);
+    println!("Network Slice Price: ${:.2}", contract.network_slice_price);
+    println!("Status: {:?}", contract.status);
+    println!("Start Date: {}", contract.start_date);
+    println!("End Date: {}", contract.end_date);
+    println!("Billing Period: {:?}", contract.billing_period);
+    println!("Signature User: {}", contract.signature_user);
+    println!("Signature Hoster: {}", contract.signature_hoster);
+    println!("Created At: {}", contract.base_data.created_at);
+    println!("Modified At: {}", contract.base_data.modified_at);
+    
+    // Print compute slices details
+    if !contract.compute_slices.is_empty() {
+        println!("  Compute Slices:");
+        for (i, slice) in contract.compute_slices.iter().enumerate() {
+            println!("    {}. Node: {}, ID: {}, Memory: {:.1}GB, Storage: {:.1}GB, Passmark: {}, vCores: {}", 
+                i + 1, slice.node_id, slice.id, slice.mem_gb, slice.storage_gb, slice.passmark, slice.vcores);
+        }
+    }
+    
+    // Print storage slices details
+    if !contract.storage_slices.is_empty() {
+        println!("  Storage Slices:");
+        for (i, slice) in contract.storage_slices.iter().enumerate() {
+            println!("    {}. Node: {}, ID: {}, Size: {}GB", 
+                i + 1, slice.node_id, slice.id, slice.storage_size_gb);
+        }
+    }
+}
+
+fn main() {
+    // Create a new DB instance in /tmp/grid4_contracts_db, and reset before every run
+    let db = heromodels::db::hero::OurDB::new("/tmp/grid4_contracts_db", true).expect("Can create DB");
+
+    println!("Grid4 Contract Models - Basic Usage Example");
+    println!("==========================================");
+
+    // Create compute slices for contracts
+    let compute_slice1 = ComputeSliceProvisioned::new()
+        .node_id(1001)
+        .id(1)
+        .mem_gb(2.0)
+        .storage_gb(20.0)
+        .passmark(2500)
+        .vcores(2)
+        .cpu_oversubscription(150)
+        .tags("web-server,production".to_string());
+
+    let compute_slice2 = ComputeSliceProvisioned::new()
+        .node_id(1002)
+        .id(2)
+        .mem_gb(4.0)
+        .storage_gb(40.0)
+        .passmark(5000)
+        .vcores(4)
+        .cpu_oversubscription(120)
+        .tags("database,high-performance".to_string());
+
+    let compute_slice3 = ComputeSliceProvisioned::new()
+        .node_id(1003)
+        .id(1)
+        .mem_gb(8.0)
+        .storage_gb(80.0)
+        .passmark(10000)
+        .vcores(8)
+        .cpu_oversubscription(100)
+        .tags("ml-training,gpu-enabled".to_string());
+
+    // Create storage slices for contracts
+    let storage_slice1 = StorageSliceProvisioned::new()
+        .node_id(2001)
+        .id(1)
+        .storage_size_gb(100)
+        .tags("backup,cold-storage".to_string());
+
+    let storage_slice2 = StorageSliceProvisioned::new()
+        .node_id(2002)
+        .id(2)
+        .storage_size_gb(500)
+        .tags("data-lake,analytics".to_string());
+
+    let storage_slice3 = StorageSliceProvisioned::new()
+        .node_id(2003)
+        .id(1)
+        .storage_size_gb(1000)
+        .tags("archive,long-term".to_string());
+
+    // Create contracts with different configurations
+
+    // Contract 1 - Small web hosting contract
+    let contract1 = Contract::new()
+        .customer_id(201)
+        .add_compute_slice(compute_slice1.clone())
+        .add_storage_slice(storage_slice1.clone())
+        .compute_slice_price(0.05)
+        .storage_slice_price(0.02)
+        .network_slice_price(0.01)
+        .status(ContractStatus::Active)
+        .start_date(1640995200) // 2022-01-01
+        .end_date(1672531200)   // 2023-01-01
+        .billing_period(BillingPeriod::Monthly)
+        .signature_user("contract_user_201_abc123".to_string())
+        .signature_hoster("hoster_node1001_xyz789".to_string());
+
+    // Contract 2 - Database hosting contract
+    let contract2 = Contract::new()
+        .customer_id(202)
+        .add_compute_slice(compute_slice2.clone())
+        .add_storage_slice(storage_slice2.clone())
+        .compute_slice_price(0.04)
+        .storage_slice_price(0.015)
+        .network_slice_price(0.008)
+        .status(ContractStatus::Active)
+        .start_date(1640995200)
+        .end_date(1704067200)   // 2024-01-01
+        .billing_period(BillingPeriod::Yearly)
+        .signature_user("contract_user_202_def456".to_string())
+        .signature_hoster("hoster_node1002_uvw123".to_string());
+
+    // Contract 3 - ML training contract (paused)
+    let contract3 = Contract::new()
+        .customer_id(203)
+        .add_compute_slice(compute_slice3.clone())
+        .add_storage_slice(storage_slice3.clone())
+        .compute_slice_price(0.08)
+        .storage_slice_price(0.01)
+        .network_slice_price(0.015)
+        .status(ContractStatus::Paused)
+        .start_date(1640995200)
+        .end_date(1672531200)
+        .billing_period(BillingPeriod::Hourly)
+        .signature_user("contract_user_203_ghi789".to_string())
+        .signature_hoster("hoster_node1003_rst456".to_string());
+
+    // Contract 4 - Multi-slice enterprise contract
+    let contract4 = Contract::new()
+        .customer_id(204)
+        .add_compute_slice(compute_slice1.clone())
+        .add_compute_slice(compute_slice2.clone())
+        .add_storage_slice(storage_slice1.clone())
+        .add_storage_slice(storage_slice2.clone())
+        .compute_slice_price(0.045)
+        .storage_slice_price(0.018)
+        .network_slice_price(0.012)
+        .status(ContractStatus::Active)
+        .start_date(1640995200)
+        .end_date(1735689600)   // 2025-01-01
+        .billing_period(BillingPeriod::Monthly)
+        .signature_user("contract_user_204_jkl012".to_string())
+        .signature_hoster("hoster_enterprise_mno345".to_string());
+
+    // Save all contracts to database and get their assigned IDs and updated models
+    let (contract1_id, db_contract1) = db
+        .collection()
+        .expect("can open contract collection")
+        .set(&contract1)
+        .expect("can set contract");
+    let (contract2_id, db_contract2) = db
+        .collection()
+        .expect("can open contract collection")
+        .set(&contract2)
+        .expect("can set contract");
+    let (contract3_id, db_contract3) = db
+        .collection()
+        .expect("can open contract collection")
+        .set(&contract3)
+        .expect("can set contract");
+    let (contract4_id, db_contract4) = db
+        .collection()
+        .expect("can open contract collection")
+        .set(&contract4)
+        .expect("can set contract");
+
+    println!("Contract 1 assigned ID: {}", contract1_id);
+    println!("Contract 2 assigned ID: {}", contract2_id);
+    println!("Contract 3 assigned ID: {}", contract3_id);
+    println!("Contract 4 assigned ID: {}", contract4_id);
+
+    // Print all contracts retrieved from database
+    println!("\n--- Contracts Retrieved from Database ---");
+    println!("\n1. Web hosting contract:");
+    print_contract_details(&db_contract1);
+
+    println!("\n2. Database hosting contract:");
+    print_contract_details(&db_contract2);
+
+    println!("\n3. ML training contract (paused):");
+    print_contract_details(&db_contract3);
+
+    println!("\n4. Enterprise multi-slice contract:");
+    print_contract_details(&db_contract4);
+
+    // Demonstrate different ways to retrieve contracts from the database
+
+    // 1. Retrieve by customer ID index
+    println!("\n--- Retrieving Contracts by Different Methods ---");
+    println!("\n1. By Customer ID Index (Customer 202):");
+    let customer_contracts = db
+        .collection::<Contract>()
+        .expect("can open contract collection")
+        .get::<customer_id, _>(&202u32)
+        .expect("can load contracts by customer");
+
+    assert_eq!(customer_contracts.len(), 1);
+    print_contract_details(&customer_contracts[0]);
+
+    // 2. Update contract status
+    println!("\n2. Resuming Paused Contract:");
+    let mut updated_contract = db_contract3.clone();
+    updated_contract.status = ContractStatus::Active;
+
+    let (_, resumed_contract) = db
+        .collection::<Contract>()
+        .expect("can open contract collection")
+        .set(&updated_contract)
+        .expect("can update contract");
+
+    println!("Updated contract status to Active:");
+    print_contract_details(&resumed_contract);
+
+    // 3. Cancel a contract
+    println!("\n3. Cancelling a Contract:");
+    let mut cancelled_contract = db_contract1.clone();
+    cancelled_contract.status = ContractStatus::Cancelled;
+
+    let (_, final_contract) = db
+        .collection::<Contract>()
+        .expect("can open contract collection")
+        .set(&cancelled_contract)
+        .expect("can update contract");
+
+    println!("Cancelled contract:");
+    print_contract_details(&final_contract);
+
+    // Show remaining active contracts
+    let all_contracts = db
+        .collection::<Contract>()
+        .expect("can open contract collection")
+        .get_all()
+        .expect("can load all contracts");
+
+    println!("\n--- Contract Analytics ---");
+    let active_contracts: Vec<_> = all_contracts.iter()
+        .filter(|c| matches!(c.status, ContractStatus::Active))
+        .collect();
+    let paused_contracts: Vec<_> = all_contracts.iter()
+        .filter(|c| matches!(c.status, ContractStatus::Paused))
+        .collect();
+    let cancelled_contracts: Vec<_> = all_contracts.iter()
+        .filter(|c| matches!(c.status, ContractStatus::Cancelled))
+        .collect();
+
+    println!("Total Contracts: {}", all_contracts.len());
+    println!("Active Contracts: {}", active_contracts.len());
+    println!("Paused Contracts: {}", paused_contracts.len());
+    println!("Cancelled Contracts: {}", cancelled_contracts.len());
+
+    // Calculate total provisioned resources
+    let total_compute_slices: usize = all_contracts.iter().map(|c| c.compute_slices.len()).sum();
+    let total_storage_slices: usize = all_contracts.iter().map(|c| c.storage_slices.len()).sum();
+    let total_memory_gb: f64 = all_contracts.iter()
+        .flat_map(|c| &c.compute_slices)
+        .map(|s| s.mem_gb)
+        .sum();
+    let total_storage_gb: i32 = all_contracts.iter()
+        .flat_map(|c| &c.storage_slices)
+        .map(|s| s.storage_size_gb)
+        .sum();
+
+    println!("\nProvisioned Resources:");
+    println!("  Total Compute Slices: {}", total_compute_slices);
+    println!("  Total Storage Slices: {}", total_storage_slices);
+    println!("  Total Memory: {:.1} GB", total_memory_gb);
+    println!("  Total Storage: {} GB", total_storage_gb);
+
+    // Calculate average pricing
+    let avg_compute_price: f64 = all_contracts.iter().map(|c| c.compute_slice_price).sum::<f64>() / all_contracts.len() as f64;
+    let avg_storage_price: f64 = all_contracts.iter().map(|c| c.storage_slice_price).sum::<f64>() / all_contracts.len() as f64;
+    let avg_network_price: f64 = all_contracts.iter().map(|c| c.network_slice_price).sum::<f64>() / all_contracts.len() as f64;
+
+    println!("\nAverage Pricing:");
+    println!("  Compute: ${:.3} per slice", avg_compute_price);
+    println!("  Storage: ${:.3} per slice", avg_storage_price);
+    println!("  Network: ${:.3} per slice", avg_network_price);
+
+    println!("\n--- Model Information ---");
+    println!("Contract DB Prefix: {}", Contract::db_prefix());
+}
--- a/heromodels/examples/grid4_example/README.md
+++ b/heromodels/examples/grid4_example/README.md
@@ -0,0 +1,12 @@
+# Grid4 Node Example (OurDB)
+
+This example demonstrates how to use the Grid4 `Node` model against the embedded OurDB backend.
+
+- Creates an in-memory/on-disk OurDB under `/tmp`.
+- Demonstrates CRUD and simple index lookups on `country`, `nodegroupid`, and `pubkey`.
+
+Run it:
+
+```bash
+cargo run -p heromodels --example grid4_example
+```
--- a/heromodels/examples/grid4_example/example.rs
+++ b/heromodels/examples/grid4_example/example.rs
@@ -0,0 +1,66 @@
+use heromodels::db::hero::OurDB;
+use heromodels::db::{Collection, Db};
+use heromodels::models::grid4::node::node_index::{country, nodegroupid, pubkey};
+use heromodels::models::grid4::node::{ComputeSlice, DeviceInfo, Node};
+use std::sync::Arc;
+
+fn main() {
+    // Create a temp OurDB
+    let ts = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .as_nanos();
+    let path = format!("/tmp/grid4_example_{}", ts);
+    let _ = std::fs::remove_dir_all(&path);
+    let db = Arc::new(OurDB::new(&path, true).expect("create OurDB"));
+
+    let nodes = db.collection::<Node>().expect("open node collection");
+
+    // Build a node
+    let cs = ComputeSlice::new()
+        .nodeid(1)
+        .slice_id(1)
+        .mem_gb(64.0)
+        .storage_gb(1024.0)
+        .passmark(8000)
+        .vcores(24)
+        .gpus(2)
+        .price_cc(0.5);
+
+    let dev = DeviceInfo {
+        vendor: "ACME".into(),
+        ..Default::default()
+    };
+
+    let n = Node::new()
+        .nodegroupid(7)
+        .uptime(98)
+        .add_compute_slice(cs)
+        .devices(dev)
+        .country("BE")
+        .pubkey("PUB_NODE_X")
+        .build();
+
+    // Store
+    let (id, stored) = nodes.set(&n).expect("store node");
+    println!("Stored node id={id} pubkey={} country={}", stored.pubkey, stored.country);
+
+    // Query by indexes
+    let by_country = nodes.get::<country, _>("BE").expect("query country");
+    println!("Found {} nodes in country=BE", by_country.len());
+
+    let by_group = nodes.get::<nodegroupid, _>(&7).expect("query group");
+    println!("Found {} nodes in group=7", by_group.len());
+
+    let by_key = nodes.get::<pubkey, _>("PUB_NODE_X").expect("query pubkey");
+    println!("Found {} with pubkey PUB_NODE_X", by_key.len());
+
+    // Update
+    let updated = stored.clone().country("NL");
+    let (_, back) = nodes.set(&updated).expect("update node");
+    println!("Updated node country={}", back.country);
+
+    // Delete
+    nodes.delete_by_id(id).expect("delete node");
+    println!("Deleted node id={id}");
+}
--- a/heromodels/examples/grid4_node_example.rs
+++ b/heromodels/examples/grid4_node_example.rs
@@ -0,0 +1,390 @@
+use heromodels::db::{Collection, Db};
+use heromodels::models::grid4::{Node, NodeDevice, ComputeSlice, StorageSlice};
+use heromodels::models::grid4::node::node_index::{nodegroupid, country};
+use heromodels_core::Model;
+
+// Helper function to print node details
+fn print_node_details(node: &Node) {
+    println!("\n--- Node Details ---");
+    println!("ID: {}", node.get_id());
+    println!("NodeGroup ID: {}", node.nodegroupid);
+    println!("Uptime: {}%", node.uptime);
+    println!("Country: {}", node.country);
+    println!("Birth Time: {}", node.birthtime);
+    println!("Public Key: {}", node.pubkey);
+    println!("Compute Slices: {}", node.computeslices.len());
+    println!("Storage Slices: {}", node.storageslices.len());
+    println!("Created At: {}", node.base_data.created_at);
+    println!("Modified At: {}", node.base_data.modified_at);
+    
+    // Print capacity details
+    println!("  Capacity:");
+    println!("    Storage: {:.1} GB", node.capacity.storage_gb);
+    println!("    Memory: {:.1} GB", node.capacity.mem_gb);
+    println!("    GPU Memory: {:.1} GB", node.capacity.mem_gb_gpu);
+    println!("    Passmark: {}", node.capacity.passmark);
+    println!("    vCores: {}", node.capacity.vcores);
+    
+    // Print device info
+    println!("  Devices:");
+    println!("    Vendor: {}", node.devices.vendor);
+    println!("    CPUs: {}", node.devices.cpu.len());
+    println!("    GPUs: {}", node.devices.gpu.len());
+    println!("    Memory: {}", node.devices.memory.len());
+    println!("    Storage: {}", node.devices.storage.len());
+    println!("    Network: {}", node.devices.network.len());
+    
+    // Print compute slices
+    if !node.computeslices.is_empty() {
+        println!("  Compute Slices:");
+        for (i, slice) in node.computeslices.iter().enumerate() {
+            println!("    {}. ID: {}, Memory: {:.1}GB, Storage: {:.1}GB, vCores: {}, GPUs: {}", 
+                i + 1, slice.id, slice.mem_gb, slice.storage_gb, slice.vcores, slice.gpus);
+        }
+    }
+    
+    // Print storage slices
+    if !node.storageslices.is_empty() {
+        println!("  Storage Slices:");
+        for (i, slice) in node.storageslices.iter().enumerate() {
+            println!("    {}. ID: {}", i + 1, slice.id);
+        }
+    }
+}
+
+fn main() {
+    // Create a new DB instance in /tmp/grid4_nodes_db, and reset before every run
+    let db = heromodels::db::hero::OurDB::new("/tmp/grid4_nodes_db", true).expect("Can create DB");
+
+    println!("Grid4 Node Models - Basic Usage Example");
+    println!("======================================");
+
+    // Create device components for nodes
+    
+    // CPU devices
+    let cpu1 = CPUDevice {
+        id: "cpu_intel_i7_12700k".to_string(),
+        cores: 12,
+        passmark: 28500,
+        description: "Intel Core i7-12700K".to_string(),
+        cpu_brand: "Intel".to_string(),
+        cpu_version: "12th Gen".to_string(),
+    };
+    
+    let cpu2 = CPUDevice {
+        id: "cpu_amd_ryzen_9_5900x".to_string(),
+        cores: 12,
+        passmark: 32000,
+        description: "AMD Ryzen 9 5900X".to_string(),
+        cpu_brand: "AMD".to_string(),
+        cpu_version: "Zen 3".to_string(),
+    };
+
+    // GPU devices
+    let gpu1 = GPUDevice {
+        id: "gpu_rtx_3080".to_string(),
+        cores: 8704,
+        memory_gb: 10.0,
+        description: "NVIDIA GeForce RTX 3080".to_string(),
+        gpu_brand: "NVIDIA".to_string(),
+        gpu_version: "RTX 30 Series".to_string(),
+    };
+    
+    let gpu2 = GPUDevice {
+        id: "gpu_rtx_4090".to_string(),
+        cores: 16384,
+        memory_gb: 24.0,
+        description: "NVIDIA GeForce RTX 4090".to_string(),
+        gpu_brand: "NVIDIA".to_string(),
+        gpu_version: "RTX 40 Series".to_string(),
+    };
+
+    // Memory devices
+    let memory1 = MemoryDevice {
+        id: "mem_ddr4_32gb".to_string(),
+        size_gb: 32.0,
+        description: "DDR4-3200 32GB Kit".to_string(),
+    };
+    
+    let memory2 = MemoryDevice {
+        id: "mem_ddr5_64gb".to_string(),
+        size_gb: 64.0,
+        description: "DDR5-5600 64GB Kit".to_string(),
+    };
+
+    // Storage devices
+    let storage1 = StorageDevice {
+        id: "ssd_nvme_1tb".to_string(),
+        size_gb: 1000.0,
+        description: "NVMe SSD 1TB".to_string(),
+    };
+    
+    let storage2 = StorageDevice {
+        id: "hdd_sata_4tb".to_string(),
+        size_gb: 4000.0,
+        description: "SATA HDD 4TB".to_string(),
+    };
+
+    // Network devices
+    let network1 = NetworkDevice {
+        id: "eth_1gbit".to_string(),
+        speed_mbps: 1000,
+        description: "Gigabit Ethernet".to_string(),
+    };
+    
+    let network2 = NetworkDevice {
+        id: "eth_10gbit".to_string(),
+        speed_mbps: 10000,
+        description: "10 Gigabit Ethernet".to_string(),
+    };
+
+    // Create device info configurations
+    let devices1 = DeviceInfo {
+        vendor: "Dell".to_string(),
+        cpu: vec![cpu1.clone()],
+        gpu: vec![gpu1.clone()],
+        memory: vec![memory1.clone()],
+        storage: vec![storage1.clone(), storage2.clone()],
+        network: vec![network1.clone()],
+    };
+    
+    let devices2 = DeviceInfo {
+        vendor: "HP".to_string(),
+        cpu: vec![cpu2.clone()],
+        gpu: vec![gpu2.clone()],
+        memory: vec![memory2.clone()],
+        storage: vec![storage1.clone()],
+        network: vec![network2.clone()],
+    };
+
+    // Create node capacities
+    let capacity1 = NodeCapacity {
+        storage_gb: 5000.0,
+        mem_gb: 32.0,
+        mem_gb_gpu: 10.0,
+        passmark: 28500,
+        vcores: 24,
+    };
+    
+    let capacity2 = NodeCapacity {
+        storage_gb: 1000.0,
+        mem_gb: 64.0,
+        mem_gb_gpu: 24.0,
+        passmark: 32000,
+        vcores: 24,
+    };
+
+    // Create compute slices
+    let compute_slice1 = ComputeSlice::new()
+        .id(1)
+        .mem_gb(4.0)
+        .storage_gb(100.0)
+        .passmark(3000)
+        .vcores(2)
+        .cpu_oversubscription(150)
+        .storage_oversubscription(120)
+        .gpus(0);
+    
+    let compute_slice2 = ComputeSlice::new()
+        .id(2)
+        .mem_gb(8.0)
+        .storage_gb(200.0)
+        .passmark(6000)
+        .vcores(4)
+        .cpu_oversubscription(130)
+        .storage_oversubscription(110)
+        .gpus(1);
+    
+    let compute_slice3 = ComputeSlice::new()
+        .id(1)
+        .mem_gb(16.0)
+        .storage_gb(400.0)
+        .passmark(12000)
+        .vcores(8)
+        .cpu_oversubscription(110)
+        .storage_oversubscription(100)
+        .gpus(1);
+
+    // Create storage slices
+    let storage_slice1 = StorageSlice::new().id(1);
+    let storage_slice2 = StorageSlice::new().id(2);
+    let storage_slice3 = StorageSlice::new().id(3);
+
+    // Create nodes with different configurations
+
+    // Node 1 - Web hosting node
+    let node1 = Node::new()
+        .nodegroupid(1001)
+        .uptime(98)
+        .add_compute_slice(compute_slice1.clone())
+        .add_compute_slice(compute_slice2.clone())
+        .add_storage_slice(storage_slice1.clone())
+        .add_storage_slice(storage_slice2.clone())
+        .devices(devices1.clone())
+        .country("US".to_string())
+        .capacity(capacity1.clone())
+        .birthtime(1640995200) // 2022-01-01
+        .pubkey("node1_pubkey_abc123xyz789".to_string())
+        .signature_node("node1_signature_def456".to_string())
+        .signature_farmer("farmer1_signature_ghi789".to_string());
+
+    // Node 2 - High-performance computing node
+    let node2 = Node::new()
+        .nodegroupid(1002)
+        .uptime(99)
+        .add_compute_slice(compute_slice3.clone())
+        .add_storage_slice(storage_slice3.clone())
+        .devices(devices2.clone())
+        .country("DE".to_string())
+        .capacity(capacity2.clone())
+        .birthtime(1672531200) // 2023-01-01
+        .pubkey("node2_pubkey_jkl012mno345".to_string())
+        .signature_node("node2_signature_pqr678".to_string())
+        .signature_farmer("farmer2_signature_stu901".to_string());
+
+    // Node 3 - Storage-focused node
+    let node3 = Node::new()
+        .nodegroupid(1001)
+        .uptime(95)
+        .add_storage_slice(storage_slice1.clone())
+        .add_storage_slice(storage_slice2.clone())
+        .add_storage_slice(storage_slice3.clone())
+        .devices(devices1.clone())
+        .country("NL".to_string())
+        .capacity(capacity1.clone())
+        .birthtime(1704067200) // 2024-01-01
+        .pubkey("node3_pubkey_vwx234yzab567".to_string())
+        .signature_node("node3_signature_cde890".to_string())
+        .signature_farmer("farmer1_signature_fgh123".to_string());
+
+    // Save all nodes to database and get their assigned IDs and updated models
+    let (node1_id, db_node1) = db
+        .collection()
+        .expect("can open node collection")
+        .set(&node1)
+        .expect("can set node");
+    let (node2_id, db_node2) = db
+        .collection()
+        .expect("can open node collection")
+        .set(&node2)
+        .expect("can set node");
+    let (node3_id, db_node3) = db
+        .collection()
+        .expect("can open node collection")
+        .set(&node3)
+        .expect("can set node");
+
+    println!("Node 1 assigned ID: {}", node1_id);
+    println!("Node 2 assigned ID: {}", node2_id);
+    println!("Node 3 assigned ID: {}", node3_id);
+
+    // Print all nodes retrieved from database
+    println!("\n--- Nodes Retrieved from Database ---");
+    println!("\n1. Web hosting node:");
+    print_node_details(&db_node1);
+
+    println!("\n2. High-performance computing node:");
+    print_node_details(&db_node2);
+
+    println!("\n3. Storage-focused node:");
+    print_node_details(&db_node3);
+
+    // Demonstrate different ways to retrieve nodes from the database
+
+    // 1. Retrieve by nodegroup ID index
+    println!("\n--- Retrieving Nodes by Different Methods ---");
+    println!("\n1. By NodeGroup ID Index (NodeGroup 1001):");
+    let nodegroup_nodes = db
+        .collection::<Node>()
+        .expect("can open node collection")
+        .get::<nodegroupid, _>(&1001i32)
+        .expect("can load nodes by nodegroup");
+
+    assert_eq!(nodegroup_nodes.len(), 2);
+    for (i, node) in nodegroup_nodes.iter().enumerate() {
+        println!("  Node {}: ID {}, Country: {}, Uptime: {}%", 
+            i + 1, node.get_id(), node.country, node.uptime);
+    }
+
+    // 2. Retrieve by country index
+    println!("\n2. By Country Index (Germany - DE):");
+    let country_nodes = db
+        .collection::<Node>()
+        .expect("can open node collection")
+        .get::<country, _>("DE")
+        .expect("can load nodes by country");
+
+    assert_eq!(country_nodes.len(), 1);
+    print_node_details(&country_nodes[0]);
+
+    // 3. Update node uptime
+    println!("\n3. Updating Node Uptime:");
+    let mut updated_node = db_node1.clone();
+    updated_node.uptime = 99;
+
+    let (_, uptime_updated_node) = db
+        .collection::<Node>()
+        .expect("can open node collection")
+        .set(&updated_node)
+        .expect("can update node");
+
+    println!("Updated node uptime to 99%:");
+    println!("  Node ID: {}, New Uptime: {}%", uptime_updated_node.get_id(), uptime_updated_node.uptime);
+
+    // Show all nodes and calculate analytics
+    let all_nodes = db
+        .collection::<Node>()
+        .expect("can open node collection")
+        .get_all()
+        .expect("can load all nodes");
+
+    println!("\n--- Node Analytics ---");
+    println!("Total Nodes: {}", all_nodes.len());
+
+    // Calculate total capacity
+    let total_storage_gb: f64 = all_nodes.iter().map(|n| n.capacity.storage_gb).sum();
+    let total_memory_gb: f64 = all_nodes.iter().map(|n| n.capacity.mem_gb).sum();
+    let total_gpu_memory_gb: f64 = all_nodes.iter().map(|n| n.capacity.mem_gb_gpu).sum();
+    let total_vcores: i32 = all_nodes.iter().map(|n| n.capacity.vcores).sum();
+    let avg_uptime: f64 = all_nodes.iter().map(|n| n.uptime as f64).sum::<f64>() / all_nodes.len() as f64;
+
+    println!("Total Capacity:");
+    println!("  Storage: {:.1} GB", total_storage_gb);
+    println!("  Memory: {:.1} GB", total_memory_gb);
+    println!("  GPU Memory: {:.1} GB", total_gpu_memory_gb);
+    println!("  vCores: {}", total_vcores);
+    println!("  Average Uptime: {:.1}%", avg_uptime);
+
+    // Count nodes by country
+    let mut country_counts = std::collections::HashMap::new();
+    for node in &all_nodes {
+        *country_counts.entry(&node.country).or_insert(0) += 1;
+    }
+
+    println!("\nNodes by Country:");
+    for (country, count) in country_counts {
+        println!("  {}: {}", country, count);
+    }
+
+    // Count total slices
+    let total_compute_slices: usize = all_nodes.iter().map(|n| n.computeslices.len()).sum();
+    let total_storage_slices: usize = all_nodes.iter().map(|n| n.storageslices.len()).sum();
+
+    println!("\nTotal Slices:");
+    println!("  Compute Slices: {}", total_compute_slices);
+    println!("  Storage Slices: {}", total_storage_slices);
+
+    // Vendor distribution
+    let mut vendor_counts = std::collections::HashMap::new();
+    for node in &all_nodes {
+        *vendor_counts.entry(&node.devices.vendor).or_insert(0) += 1;
+    }
+
+    println!("\nNodes by Vendor:");
+    for (vendor, count) in vendor_counts {
+        println!("  {}: {}", vendor, count);
+    }
+
+    println!("\n--- Model Information ---");
+    println!("Node DB Prefix: {}", Node::db_prefix());
+}
--- a/heromodels/examples/grid4_nodegroup_example.rs
+++ b/heromodels/examples/grid4_nodegroup_example.rs
@@ -0,0 +1,284 @@
+use heromodels::db::{Collection, Db};
+use heromodels::models::grid4::{NodeGroup, PricingPolicy, SLAPolicy};
+use heromodels_core::Model;
+
+// Helper function to print nodegroup details
+fn print_nodegroup_details(nodegroup: &NodeGroup) {
+    println!("\n--- NodeGroup Details ---");
+    println!("ID: {}", nodegroup.get_id());
+    println!("Farmer ID: {}", nodegroup.farmerid);
+    println!("Description: {}", nodegroup.description);
+    println!("Secret: {}", nodegroup.secret);
+    println!("Compute Slice Pricing (CC): {:.4}", nodegroup.compute_slice_normalized_pricing_cc);
+    println!("Storage Slice Pricing (CC): {:.4}", nodegroup.storage_slice_normalized_pricing_cc);
+    println!("Signature Farmer: {}", nodegroup.signature_farmer);
+    println!("Created At: {}", nodegroup.base_data.created_at);
+    println!("Modified At: {}", nodegroup.base_data.modified_at);
+    
+    // Print SLA Policy details
+    println!("  SLA Policy:");
+    println!("    Uptime: {}%", nodegroup.slapolicy.sla_uptime);
+    println!("    Bandwidth: {} Mbit/s", nodegroup.slapolicy.sla_bandwidth_mbit);
+    println!("    Penalty: {}%", nodegroup.slapolicy.sla_penalty);
+    
+    // Print Pricing Policy details
+    println!("  Pricing Policy:");
+    println!("    Marketplace Year Discounts: {:?}%", nodegroup.pricingpolicy.marketplace_year_discounts);
+}
+
+fn main() {
+    // Create a new DB instance in /tmp/grid4_nodegroups_db, and reset before every run
+    let db = heromodels::db::hero::OurDB::new("/tmp/grid4_nodegroups_db", true).expect("Can create DB");
+
+    println!("Grid4 NodeGroup Models - Basic Usage Example");
+    println!("===========================================");
+
+    // Create SLA policies
+    let sla_policy_premium = SLAPolicy {
+        sla_uptime: 99,
+        sla_bandwidth_mbit: 1000,
+        sla_penalty: 200,
+    };
+    
+    let sla_policy_standard = SLAPolicy {
+        sla_uptime: 95,
+        sla_bandwidth_mbit: 100,
+        sla_penalty: 100,
+    };
+    
+    let sla_policy_basic = SLAPolicy {
+        sla_uptime: 90,
+        sla_bandwidth_mbit: 50,
+        sla_penalty: 50,
+    };
+
+    // Create pricing policies
+    let pricing_policy_aggressive = PricingPolicy {
+        marketplace_year_discounts: vec![40, 50, 60],
+    };
+    
+    let pricing_policy_standard = PricingPolicy {
+        marketplace_year_discounts: vec![30, 40, 50],
+    };
+    
+    let pricing_policy_conservative = PricingPolicy {
+        marketplace_year_discounts: vec![20, 30, 40],
+    };
+
+    // Create nodegroups with different configurations
+
+    // NodeGroup 1 - Premium hosting provider
+    let nodegroup1 = NodeGroup::new()
+        .farmerid(501)
+        .secret("encrypted_boot_secret_premium_abc123".to_string())
+        .description("Premium hosting with 99% uptime SLA and high-speed connectivity".to_string())
+        .slapolicy(sla_policy_premium.clone())
+        .pricingpolicy(pricing_policy_aggressive.clone())
+        .compute_slice_normalized_pricing_cc(0.0450)
+        .storage_slice_normalized_pricing_cc(0.0180)
+        .signature_farmer("farmer_501_premium_signature_xyz789".to_string());
+
+    // NodeGroup 2 - Standard business provider
+    let nodegroup2 = NodeGroup::new()
+        .farmerid(502)
+        .secret("encrypted_boot_secret_standard_def456".to_string())
+        .description("Standard business hosting with reliable performance".to_string())
+        .slapolicy(sla_policy_standard.clone())
+        .pricingpolicy(pricing_policy_standard.clone())
+        .compute_slice_normalized_pricing_cc(0.0350)
+        .storage_slice_normalized_pricing_cc(0.0150)
+        .signature_farmer("farmer_502_standard_signature_uvw012".to_string());
+
+    // NodeGroup 3 - Budget-friendly provider
+    let nodegroup3 = NodeGroup::new()
+        .farmerid(503)
+        .secret("encrypted_boot_secret_budget_ghi789".to_string())
+        .description("Cost-effective hosting for development and testing".to_string())
+        .slapolicy(sla_policy_basic.clone())
+        .pricingpolicy(pricing_policy_conservative.clone())
+        .compute_slice_normalized_pricing_cc(0.0250)
+        .storage_slice_normalized_pricing_cc(0.0120)
+        .signature_farmer("farmer_503_budget_signature_rst345".to_string());
+
+    // NodeGroup 4 - Enterprise provider
+    let nodegroup4 = NodeGroup::new()
+        .farmerid(504)
+        .secret("encrypted_boot_secret_enterprise_jkl012".to_string())
+        .description("Enterprise-grade infrastructure with maximum reliability".to_string())
+        .slapolicy(sla_policy_premium.clone())
+        .pricingpolicy(pricing_policy_standard.clone())
+        .compute_slice_normalized_pricing_cc(0.0500)
+        .storage_slice_normalized_pricing_cc(0.0200)
+        .signature_farmer("farmer_504_enterprise_signature_mno678".to_string());
+
+    // Save all nodegroups to database and get their assigned IDs and updated models
+    let (nodegroup1_id, db_nodegroup1) = db
+        .collection()
+        .expect("can open nodegroup collection")
+        .set(&nodegroup1)
+        .expect("can set nodegroup");
+    let (nodegroup2_id, db_nodegroup2) = db
+        .collection()
+        .expect("can open nodegroup collection")
+        .set(&nodegroup2)
+        .expect("can set nodegroup");
+    let (nodegroup3_id, db_nodegroup3) = db
+        .collection()
+        .expect("can open nodegroup collection")
+        .set(&nodegroup3)
+        .expect("can set nodegroup");
+    let (nodegroup4_id, db_nodegroup4) = db
+        .collection()
+        .expect("can open nodegroup collection")
+        .set(&nodegroup4)
+        .expect("can set nodegroup");
+
+    println!("NodeGroup 1 assigned ID: {}", nodegroup1_id);
+    println!("NodeGroup 2 assigned ID: {}", nodegroup2_id);
+    println!("NodeGroup 3 assigned ID: {}", nodegroup3_id);
+    println!("NodeGroup 4 assigned ID: {}", nodegroup4_id);
+
+    // Print all nodegroups retrieved from database
+    println!("\n--- NodeGroups Retrieved from Database ---");
+    println!("\n1. Premium hosting provider:");
+    print_nodegroup_details(&db_nodegroup1);
+
+    println!("\n2. Standard business provider:");
+    print_nodegroup_details(&db_nodegroup2);
+
+    println!("\n3. Budget-friendly provider:");
+    print_nodegroup_details(&db_nodegroup3);
+
+    println!("\n4. Enterprise provider:");
+    print_nodegroup_details(&db_nodegroup4);
+
+    // Demonstrate different ways to retrieve nodegroups from the database
+
+    // 1. Retrieve by farmer ID index
+    println!("\n--- Retrieving NodeGroups by Different Methods ---");
+    println!("\n1. By Farmer ID Index (Farmer 502):");
+    let farmer_nodegroups = db
+        .collection::<NodeGroup>()
+        .expect("can open nodegroup collection")
+        .get_by_index("farmerid", &502u32)
+        .expect("can load nodegroups by farmer");
+
+    assert_eq!(farmer_nodegroups.len(), 1);
+    print_nodegroup_details(&farmer_nodegroups[0]);
+
+    // 2. Update nodegroup pricing
+    println!("\n2. Updating NodeGroup Pricing:");
+    let mut updated_nodegroup = db_nodegroup3.clone();
+    updated_nodegroup.compute_slice_normalized_pricing_cc = 0.0280;
+    updated_nodegroup.storage_slice_normalized_pricing_cc = 0.0130;
+
+    let (_, price_updated_nodegroup) = db
+        .collection::<NodeGroup>()
+        .expect("can open nodegroup collection")
+        .set(&updated_nodegroup)
+        .expect("can update nodegroup");
+
+    println!("Updated pricing for budget provider:");
+    println!("  Compute: {:.4} CC", price_updated_nodegroup.compute_slice_normalized_pricing_cc);
+    println!("  Storage: {:.4} CC", price_updated_nodegroup.storage_slice_normalized_pricing_cc);
+
+    // 3. Update SLA policy
+    println!("\n3. Updating SLA Policy:");
+    let mut sla_updated_nodegroup = db_nodegroup2.clone();
+    sla_updated_nodegroup.slapolicy.sla_uptime = 98;
+    sla_updated_nodegroup.slapolicy.sla_bandwidth_mbit = 500;
+
+    let (_, sla_updated_nodegroup) = db
+        .collection::<NodeGroup>()
+        .expect("can open nodegroup collection")
+        .set(&sla_updated_nodegroup)
+        .expect("can update nodegroup");
+
+    println!("Updated SLA policy for standard provider:");
+    println!("  Uptime: {}%", sla_updated_nodegroup.slapolicy.sla_uptime);
+    println!("  Bandwidth: {} Mbit/s", sla_updated_nodegroup.slapolicy.sla_bandwidth_mbit);
+
+    // Show all nodegroups and calculate analytics
+    let all_nodegroups = db
+        .collection::<NodeGroup>()
+        .expect("can open nodegroup collection")
+        .get_all()
+        .expect("can load all nodegroups");
+
+    println!("\n--- NodeGroup Analytics ---");
+    println!("Total NodeGroups: {}", all_nodegroups.len());
+
+    // Calculate pricing statistics
+    let avg_compute_price: f64 = all_nodegroups.iter()
+        .map(|ng| ng.compute_slice_normalized_pricing_cc)
+        .sum::<f64>() / all_nodegroups.len() as f64;
+    let avg_storage_price: f64 = all_nodegroups.iter()
+        .map(|ng| ng.storage_slice_normalized_pricing_cc)
+        .sum::<f64>() / all_nodegroups.len() as f64;
+
+    let min_compute_price = all_nodegroups.iter()
+        .map(|ng| ng.compute_slice_normalized_pricing_cc)
+        .fold(f64::INFINITY, f64::min);
+    let max_compute_price = all_nodegroups.iter()
+        .map(|ng| ng.compute_slice_normalized_pricing_cc)
+        .fold(f64::NEG_INFINITY, f64::max);
+
+    println!("Pricing Statistics:");
+    println!("  Average Compute Price: {:.4} CC", avg_compute_price);
+    println!("  Average Storage Price: {:.4} CC", avg_storage_price);
+    println!("  Compute Price Range: {:.4} - {:.4} CC", min_compute_price, max_compute_price);
+
+    // Calculate SLA statistics
+    let avg_uptime: f64 = all_nodegroups.iter()
+        .map(|ng| ng.slapolicy.sla_uptime as f64)
+        .sum::<f64>() / all_nodegroups.len() as f64;
+    let avg_bandwidth: f64 = all_nodegroups.iter()
+        .map(|ng| ng.slapolicy.sla_bandwidth_mbit as f64)
+        .sum::<f64>() / all_nodegroups.len() as f64;
+    let avg_penalty: f64 = all_nodegroups.iter()
+        .map(|ng| ng.slapolicy.sla_penalty as f64)
+        .sum::<f64>() / all_nodegroups.len() as f64;
+
+    println!("\nSLA Statistics:");
+    println!("  Average Uptime Guarantee: {:.1}%", avg_uptime);
+    println!("  Average Bandwidth Guarantee: {:.0} Mbit/s", avg_bandwidth);
+    println!("  Average Penalty Rate: {:.0}%", avg_penalty);
+
+    // Count farmers
+    let unique_farmers: std::collections::HashSet<_> = all_nodegroups.iter()
+        .map(|ng| ng.farmerid)
+        .collect();
+
+    println!("\nFarmer Statistics:");
+    println!("  Unique Farmers: {}", unique_farmers.len());
+    println!("  NodeGroups per Farmer: {:.1}", all_nodegroups.len() as f64 / unique_farmers.len() as f64);
+
+    // Analyze discount policies
+    let total_discount_tiers: usize = all_nodegroups.iter()
+        .map(|ng| ng.pricingpolicy.marketplace_year_discounts.len())
+        .sum();
+    let avg_discount_tiers: f64 = total_discount_tiers as f64 / all_nodegroups.len() as f64;
+
+    println!("\nDiscount Policy Statistics:");
+    println!("  Average Discount Tiers: {:.1}", avg_discount_tiers);
+
+    // Find best value providers (high SLA, low price)
+    println!("\n--- Provider Rankings ---");
+    let mut providers_with_scores: Vec<_> = all_nodegroups.iter()
+        .map(|ng| {
+            let value_score = (ng.slapolicy.sla_uptime as f64) / ng.compute_slice_normalized_pricing_cc;
+            (ng, value_score)
+        })
+        .collect();
+    
+    providers_with_scores.sort_by(|a, b| b.1.partial_cmp(&a.1).unwrap());
+
+    println!("Best Value Providers (Uptime/Price ratio):");
+    for (i, (ng, score)) in providers_with_scores.iter().enumerate() {
+        println!("  {}. Farmer {}: {:.0} ({}% uptime, {:.4} CC)", 
+            i + 1, ng.farmerid, score, ng.slapolicy.sla_uptime, ng.compute_slice_normalized_pricing_cc);
+    }
+
+    println!("\n--- Model Information ---");
+    println!("NodeGroup DB Prefix: {}", NodeGroup::db_prefix());
+}
--- a/heromodels/examples/grid4_reputation_example.rs
+++ b/heromodels/examples/grid4_reputation_example.rs
@@ -0,0 +1,311 @@
+use heromodels::db::{Collection, Db};
+use heromodels::models::grid4::{NodeGroupReputation, NodeReputation};
+use heromodels_core::Model;
+
+// Helper function to print nodegroup reputation details
+fn print_nodegroup_reputation_details(reputation: &NodeGroupReputation) {
+    println!("\n--- NodeGroup Reputation Details ---");
+    println!("ID: {}", reputation.get_id());
+    println!("NodeGroup ID: {}", reputation.nodegroup_id);
+    println!("Reputation Score: {}/100", reputation.reputation);
+    println!("Uptime: {}%", reputation.uptime);
+    println!("Node Count: {}", reputation.nodes.len());
+    println!("Created At: {}", reputation.base_data.created_at);
+    println!("Modified At: {}", reputation.base_data.modified_at);
+    
+    // Print individual node reputations
+    if !reputation.nodes.is_empty() {
+        println!("  Individual Node Reputations:");
+        for (i, node_rep) in reputation.nodes.iter().enumerate() {
+            println!("    {}. Node {}: Reputation {}/100, Uptime {}%", 
+                i + 1, node_rep.node_id, node_rep.reputation, node_rep.uptime);
+        }
+        
+        // Calculate average node reputation and uptime
+        let avg_node_reputation: f64 = reputation.nodes.iter()
+            .map(|n| n.reputation as f64)
+            .sum::<f64>() / reputation.nodes.len() as f64;
+        let avg_node_uptime: f64 = reputation.nodes.iter()
+            .map(|n| n.uptime as f64)
+            .sum::<f64>() / reputation.nodes.len() as f64;
+        
+        println!("    Average Node Reputation: {:.1}/100", avg_node_reputation);
+        println!("    Average Node Uptime: {:.1}%", avg_node_uptime);
+    }
+}
+
+fn main() {
+    // Create a new DB instance in /tmp/grid4_reputation_db, and reset before every run
+    let db = heromodels::db::hero::OurDB::new("/tmp/grid4_reputation_db", true).expect("Can create DB");
+
+    println!("Grid4 Reputation Models - Basic Usage Example");
+    println!("============================================");
+
+    // Create individual node reputations
+    
+    // High-performing nodes
+    let node_rep1 = NodeReputation::new()
+        .node_id(1001)
+        .reputation(85)
+        .uptime(99);
+    
+    let node_rep2 = NodeReputation::new()
+        .node_id(1002)
+        .reputation(92)
+        .uptime(98);
+    
+    let node_rep3 = NodeReputation::new()
+        .node_id(1003)
+        .reputation(78)
+        .uptime(97);
+
+    // Medium-performing nodes
+    let node_rep4 = NodeReputation::new()
+        .node_id(2001)
+        .reputation(65)
+        .uptime(94);
+    
+    let node_rep5 = NodeReputation::new()
+        .node_id(2002)
+        .reputation(72)
+        .uptime(96);
+
+    // Lower-performing nodes
+    let node_rep6 = NodeReputation::new()
+        .node_id(3001)
+        .reputation(45)
+        .uptime(88);
+    
+    let node_rep7 = NodeReputation::new()
+        .node_id(3002)
+        .reputation(38)
+        .uptime(85);
+
+    // New nodes with default reputation
+    let node_rep8 = NodeReputation::new()
+        .node_id(4001)
+        .reputation(50) // default
+        .uptime(0);     // just started
+    
+    let node_rep9 = NodeReputation::new()
+        .node_id(4002)
+        .reputation(50) // default
+        .uptime(0);     // just started
+
+    // Create nodegroup reputations with different performance profiles
+
+    // NodeGroup 1 - High-performance provider
+    let nodegroup_rep1 = NodeGroupReputation::new()
+        .nodegroup_id(1001)
+        .reputation(85) // high reputation earned over time
+        .uptime(98)     // excellent uptime
+        .add_node_reputation(node_rep1.clone())
+        .add_node_reputation(node_rep2.clone())
+        .add_node_reputation(node_rep3.clone());
+
+    // NodeGroup 2 - Medium-performance provider
+    let nodegroup_rep2 = NodeGroupReputation::new()
+        .nodegroup_id(1002)
+        .reputation(68) // decent reputation
+        .uptime(95)     // good uptime
+        .add_node_reputation(node_rep4.clone())
+        .add_node_reputation(node_rep5.clone());
+
+    // NodeGroup 3 - Struggling provider
+    let nodegroup_rep3 = NodeGroupReputation::new()
+        .nodegroup_id(1003)
+        .reputation(42) // below average reputation
+        .uptime(87)     // poor uptime
+        .add_node_reputation(node_rep6.clone())
+        .add_node_reputation(node_rep7.clone());
+
+    // NodeGroup 4 - New provider (default reputation)
+    let nodegroup_rep4 = NodeGroupReputation::new()
+        .nodegroup_id(1004)
+        .reputation(50) // default starting reputation
+        .uptime(0)      // no history yet
+        .add_node_reputation(node_rep8.clone())
+        .add_node_reputation(node_rep9.clone());
+
+    // Save all nodegroup reputations to database and get their assigned IDs and updated models
+    let (rep1_id, db_rep1) = db
+        .collection()
+        .expect("can open reputation collection")
+        .set(&nodegroup_rep1)
+        .expect("can set reputation");
+    let (rep2_id, db_rep2) = db
+        .collection()
+        .expect("can open reputation collection")
+        .set(&nodegroup_rep2)
+        .expect("can set reputation");
+    let (rep3_id, db_rep3) = db
+        .collection()
+        .expect("can open reputation collection")
+        .set(&nodegroup_rep3)
+        .expect("can set reputation");
+    let (rep4_id, db_rep4) = db
+        .collection()
+        .expect("can open reputation collection")
+        .set(&nodegroup_rep4)
+        .expect("can set reputation");
+
+    println!("NodeGroup Reputation 1 assigned ID: {}", rep1_id);
+    println!("NodeGroup Reputation 2 assigned ID: {}", rep2_id);
+    println!("NodeGroup Reputation 3 assigned ID: {}", rep3_id);
+    println!("NodeGroup Reputation 4 assigned ID: {}", rep4_id);
+
+    // Print all reputation records retrieved from database
+    println!("\n--- Reputation Records Retrieved from Database ---");
+    println!("\n1. High-performance provider:");
+    print_nodegroup_reputation_details(&db_rep1);
+
+    println!("\n2. Medium-performance provider:");
+    print_nodegroup_reputation_details(&db_rep2);
+
+    println!("\n3. Struggling provider:");
+    print_nodegroup_reputation_details(&db_rep3);
+
+    println!("\n4. New provider:");
+    print_nodegroup_reputation_details(&db_rep4);
+
+    // Demonstrate different ways to retrieve reputation records from the database
+
+    // 1. Retrieve by nodegroup ID index
+    println!("\n--- Retrieving Reputation by Different Methods ---");
+    println!("\n1. By NodeGroup ID Index (NodeGroup 1002):");
+    let nodegroup_reps = db
+        .collection::<NodeGroupReputation>()
+        .expect("can open reputation collection")
+        .get_by_index("nodegroup_id", &1002u32)
+        .expect("can load reputation by nodegroup");
+
+    assert_eq!(nodegroup_reps.len(), 1);
+    print_nodegroup_reputation_details(&nodegroup_reps[0]);
+
+    // 2. Update reputation scores (simulate performance improvement)
+    println!("\n2. Updating Reputation Scores (Performance Improvement):");
+    let mut improved_rep = db_rep3.clone();
+    improved_rep.reputation = 55; // improved from 42
+    improved_rep.uptime = 92;     // improved from 87
+    
+    // Also improve individual node reputations
+    for node_rep in &mut improved_rep.nodes {
+        node_rep.reputation += 10; // boost each node's reputation
+        node_rep.uptime += 5;      // improve uptime
+    }
+
+    let (_, updated_rep) = db
+        .collection::<NodeGroupReputation>()
+        .expect("can open reputation collection")
+        .set(&improved_rep)
+        .expect("can update reputation");
+
+    println!("Updated reputation for struggling provider:");
+    print_nodegroup_reputation_details(&updated_rep);
+
+    // 3. Add new node to existing nodegroup reputation
+    println!("\n3. Adding New Node to Existing NodeGroup:");
+    let new_node_rep = NodeReputation::new()
+        .node_id(1004)
+        .reputation(88)
+        .uptime(99);
+
+    let mut expanded_rep = db_rep1.clone();
+    expanded_rep.add_node_reputation(new_node_rep);
+    // Recalculate nodegroup reputation based on node average
+    let total_node_rep: i32 = expanded_rep.nodes.iter().map(|n| n.reputation).sum();
+    expanded_rep.reputation = total_node_rep / expanded_rep.nodes.len() as i32;
+
+    let (_, expanded_rep) = db
+        .collection::<NodeGroupReputation>()
+        .expect("can open reputation collection")
+        .set(&expanded_rep)
+        .expect("can update reputation");
+
+    println!("Added new high-performing node to top provider:");
+    print_nodegroup_reputation_details(&expanded_rep);
+
+    // Show all reputation records and calculate analytics
+    let all_reps = db
+        .collection::<NodeGroupReputation>()
+        .expect("can open reputation collection")
+        .get_all()
+        .expect("can load all reputations");
+
+    println!("\n--- Reputation Analytics ---");
+    println!("Total NodeGroup Reputations: {}", all_reps.len());
+
+    // Calculate overall statistics
+    let avg_nodegroup_reputation: f64 = all_reps.iter()
+        .map(|r| r.reputation as f64)
+        .sum::<f64>() / all_reps.len() as f64;
+    let avg_nodegroup_uptime: f64 = all_reps.iter()
+        .filter(|r| r.uptime > 0) // exclude new providers with 0 uptime
+        .map(|r| r.uptime as f64)
+        .sum::<f64>() / all_reps.iter().filter(|r| r.uptime > 0).count() as f64;
+
+    println!("Overall Statistics:");
+    println!("  Average NodeGroup Reputation: {:.1}/100", avg_nodegroup_reputation);
+    println!("  Average NodeGroup Uptime: {:.1}%", avg_nodegroup_uptime);
+
+    // Count reputation tiers
+    let excellent_reps = all_reps.iter().filter(|r| r.reputation >= 80).count();
+    let good_reps = all_reps.iter().filter(|r| r.reputation >= 60 && r.reputation < 80).count();
+    let average_reps = all_reps.iter().filter(|r| r.reputation >= 40 && r.reputation < 60).count();
+    let poor_reps = all_reps.iter().filter(|r| r.reputation < 40).count();
+
+    println!("\nReputation Distribution:");
+    println!("  Excellent (80-100): {}", excellent_reps);
+    println!("  Good (60-79): {}", good_reps);
+    println!("  Average (40-59): {}", average_reps);
+    println!("  Poor (0-39): {}", poor_reps);
+
+    // Calculate total nodes and their statistics
+    let total_nodes: usize = all_reps.iter().map(|r| r.nodes.len()).sum();
+    let all_node_reps: Vec<i32> = all_reps.iter()
+        .flat_map(|r| &r.nodes)
+        .map(|n| n.reputation)
+        .collect();
+    let all_node_uptimes: Vec<i32> = all_reps.iter()
+        .flat_map(|r| &r.nodes)
+        .filter(|n| n.uptime > 0)
+        .map(|n| n.uptime)
+        .collect();
+
+    let avg_node_reputation: f64 = all_node_reps.iter().sum::<i32>() as f64 / all_node_reps.len() as f64;
+    let avg_node_uptime: f64 = all_node_uptimes.iter().sum::<i32>() as f64 / all_node_uptimes.len() as f64;
+
+    println!("\nNode-Level Statistics:");
+    println!("  Total Nodes: {}", total_nodes);
+    println!("  Average Node Reputation: {:.1}/100", avg_node_reputation);
+    println!("  Average Node Uptime: {:.1}%", avg_node_uptime);
+
+    // Find best and worst performing nodegroups
+    let best_nodegroup = all_reps.iter().max_by_key(|r| r.reputation).unwrap();
+    let worst_nodegroup = all_reps.iter().min_by_key(|r| r.reputation).unwrap();
+
+    println!("\nPerformance Leaders:");
+    println!("  Best NodeGroup: {} (Reputation: {}, Uptime: {}%)", 
+        best_nodegroup.nodegroup_id, best_nodegroup.reputation, best_nodegroup.uptime);
+    println!("  Worst NodeGroup: {} (Reputation: {}, Uptime: {}%)", 
+        worst_nodegroup.nodegroup_id, worst_nodegroup.reputation, worst_nodegroup.uptime);
+
+    // Rank nodegroups by reputation
+    let mut ranked_nodegroups: Vec<_> = all_reps.iter().collect();
+    ranked_nodegroups.sort_by(|a, b| b.reputation.cmp(&a.reputation));
+
+    println!("\nNodeGroup Rankings (by Reputation):");
+    for (i, rep) in ranked_nodegroups.iter().enumerate() {
+        let status = match rep.reputation {
+            80..=100 => "Excellent",
+            60..=79 => "Good",
+            40..=59 => "Average",
+            _ => "Poor",
+        };
+        println!("  {}. NodeGroup {}: {} ({}/100, {}% uptime)", 
+            i + 1, rep.nodegroup_id, status, rep.reputation, rep.uptime);
+    }
+
+    println!("\n--- Model Information ---");
+    println!("NodeGroupReputation DB Prefix: {}", NodeGroupReputation::db_prefix());
+}
--- a/heromodels/examples/heroledger/main.rs
+++ b/heromodels/examples/heroledger/main.rs
@@ -1,6 +1,6 @@
+use heromodels::models::heroledger::rhai::register_heroledger_rhai_modules;
 use heromodels_core::db::hero::OurDB;
 use rhai::{Dynamic, Engine};
-use heromodels::models::heroledger::rhai::register_heroledger_rhai_modules;
 use std::sync::Arc;
 use std::{fs, path::Path};

--- a/heromodels/examples/heroledger_example/README.md
+++ b/heromodels/examples/heroledger_example/README.md
@@ -0,0 +1,15 @@
+# Heroledger Postgres Example
+
+This example demonstrates how to use the Heroledger `User` model against Postgres using the `heromodels::db::postgres` backend.
+
+- Connects to Postgres with user `postgres` and password `test123` on `localhost:5432`.
+- Creates the table and indexes automatically on first use.
+- Shows basic CRUD and an index lookup on `username`.
+
+Run it:
+
+```bash
+cargo run -p heromodels --example heroledger_example
+```
+
+Make sure Postgres is running locally and accessible with the credentials above.
--- a/heromodels/examples/heroledger_example/example.rs
+++ b/heromodels/examples/heroledger_example/example.rs
@@ -0,0 +1,54 @@
+use heromodels::db::postgres::{Config, Postgres};
+use heromodels::db::{Collection, Db};
+use heromodels::models::heroledger::user::user_index::username;
+use heromodels::models::heroledger::user::{SecretBox, User};
+
+fn main() {
+    let db = Postgres::new(
+        Config::new()
+            .user(Some("postgres".into()))
+            .password(Some("test123".into()))
+            .host(Some("localhost".into()))
+            .port(Some(5432)),
+    )
+    .expect("Can connect to Postgres");
+
+    println!("Heroledger User - Postgres Example");
+    println!("==================================");
+
+    let users = db.collection::<User>().expect("open user collection");
+
+    // Clean
+    if let Ok(existing) = users.get_all() {
+        for u in existing {
+            let _ = users.delete_by_id(u.get_id());
+        }
+    }
+
+    let sb = SecretBox::new().data(vec![1, 2, 3]).nonce(vec![9, 9, 9]).build();
+
+    let u = User::new(0)
+        .username("alice")
+        .pubkey("PUBKEY_A")
+        .add_email("alice@example.com")
+        .add_userprofile(sb)
+        .build();
+
+    let (id, stored) = users.set(&u).expect("store user");
+    println!("Stored user id={id} username={} pubkey={}", stored.username, stored.pubkey);
+
+    let by_idx = users.get::<username, _>("alice").expect("by username");
+    println!("Found {} user(s) with username=alice", by_idx.len());
+
+    let fetched = users.get_by_id(id).expect("get by id").expect("exists");
+    println!("Fetched by id={} username={} emails={:?}", id, fetched.username, fetched.email);
+
+    // Update
+    let updated = fetched.clone().add_email("work@alice.example");
+    let (_, back) = users.set(&updated).expect("update user");
+    println!("Updated emails = {:?}", back.email);
+
+    // Delete
+    users.delete_by_id(id).expect("delete user");
+    println!("Deleted user id={id}");
+}
--- a/heromodels/examples/postgres_example/example.rs
+++ b/heromodels/examples/postgres_example/example.rs
@@ -1,8 +1,11 @@
 use heromodels::db::postgres::Config;
 use heromodels::db::{Collection, Db};
-use heromodels::models::userexample::user::user_index::{is_active, username};
+use heromodels::models::userexample::user::user_index::{email, username};
 use heromodels::models::{Comment, User};
 use heromodels_core::Model;
+// For demonstrating embedded/nested indexes
+use heromodels::models::grid4::node::{ComputeSlice, DeviceInfo, Node};
+use heromodels::models::grid4::node::node_index::{country as node_country, pubkey as node_pubkey};

 // Helper function to print user details
 fn print_user_details(user: &User) {
@@ -37,13 +40,30 @@ fn main() {
    )
    .expect("Can connect to postgress");

+    // Unique suffix to avoid collisions with legacy rows from prior runs
+    use std::time::{SystemTime, UNIX_EPOCH};
+    let ts = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap()
+        .as_secs();
+    let user1_name = format!("johndoe_{}", ts);
+    let user2_name = format!("janesmith_{}", ts);
+    let user3_name = format!("willism_{}", ts);
+    let user4_name = format!("carrols_{}", ts);
+    let user1_email = format!("john.doe+{}@example.com", ts);
+    let user2_email = format!("jane.smith+{}@example.com", ts);
+    let user3_email = format!("willis.masters+{}@example.com", ts);
+    let user4_email = format!("carrol.smith+{}@example.com", ts);
+
    println!("Hero Models - Basic Usage Example");
    println!("================================");

    // Clean up any existing data to ensure consistent results
    println!("Cleaning up existing data...");
    let user_collection = db.collection::<User>().expect("can open user collection");
-    let comment_collection = db.collection::<Comment>().expect("can open comment collection");
+    let comment_collection = db
+        .collection::<Comment>()
+        .expect("can open comment collection");

    // Clear all existing users and comments
    if let Ok(existing_users) = user_collection.get_all() {
@@ -62,32 +82,32 @@ fn main() {

    // User 1
    let user1 = User::new()
-        .username("johndoe")
-        .email("john.doe@example.com")
+        .username(&user1_name)
+        .email(&user1_email)
        .full_name("John Doe")
        .is_active(false)
        .build();

    // User 2
    let user2 = User::new()
-        .username("janesmith")
-        .email("jane.smith@example.com")
+        .username(&user2_name)
+        .email(&user2_email)
        .full_name("Jane Smith")
        .is_active(true)
        .build();

    // User 3
    let user3 = User::new()
-        .username("willism")
-        .email("willis.masters@example.com")
+        .username(&user3_name)
+        .email(&user3_email)
        .full_name("Willis Masters")
        .is_active(true)
        .build();

    // User 4
    let user4 = User::new()
-        .username("carrols")
-        .email("carrol.smith@example.com")
+        .username(&user4_name)
+        .email(&user4_email)
        .full_name("Carrol Smith")
        .is_active(false)
        .build();
@@ -143,66 +163,95 @@ fn main() {
    let stored_users = db
        .collection::<User>()
        .expect("can open user collection")
-        .get::<username, _>("johndoe")
+        .get::<username, _>(&user1_name)
        .expect("can load stored user");

    assert_eq!(stored_users.len(), 1);
    print_user_details(&stored_users[0]);

-    // 2. Retrieve by active status
-    println!("\n2. By Active Status (Active = true):");
-    let active_users = db
+    // 2. Retrieve by email index
+    println!("\n2. By Email Index:");
+    let by_email = db
        .collection::<User>()
        .expect("can open user collection")
-        .get::<is_active, _>(&true)
-        .expect("can load stored users");
-
-    assert_eq!(active_users.len(), 2);
-    for active_user in active_users.iter() {
-        print_user_details(active_user);
-    }
+        .get::<email, _>(&user2_email)
+        .expect("can load stored user by email");
+    assert_eq!(by_email.len(), 1);
+    print_user_details(&by_email[0]);

    // 3. Delete a user and show the updated results
    println!("\n3. After Deleting a User:");
-    let user_to_delete_id = active_users[0].get_id();
+    let user_to_delete_id = stored_users[0].get_id();
    println!("Deleting user with ID: {user_to_delete_id}");
    db.collection::<User>()
        .expect("can open user collection")
        .delete_by_id(user_to_delete_id)
        .expect("can delete existing user");

-    // Show remaining active users
-    let active_users = db
+    // Verify deletion by querying the same username again
+    let should_be_empty = db
        .collection::<User>()
        .expect("can open user collection")
-        .get::<is_active, _>(&true)
-        .expect("can load stored users");
-
-    println!("   a. Remaining Active Users:");
-    assert_eq!(active_users.len(), 1);
-    for active_user in active_users.iter() {
-        print_user_details(active_user);
-    }
-
-    // Show inactive users
-    let inactive_users = db
-        .collection::<User>()
-        .expect("can open user collection")
-        .get::<is_active, _>(&false)
-        .expect("can load stored users");
-
-    println!("   b. Inactive Users:");
-    assert_eq!(inactive_users.len(), 2);
-    for inactive_user in inactive_users.iter() {
-        print_user_details(inactive_user);
-    }
+        .get::<username, _>(&user1_name)
+        .expect("can query by username after delete");
+    println!("   a. Query by username '{}' after delete -> {} results", user1_name, should_be_empty.len());
+    assert_eq!(should_be_empty.len(), 0);

    // Delete a user based on an index for good measure
    db.collection::<User>()
        .expect("can open user collection")
-        .delete::<username, _>("janesmith")
+        .delete::<username, _>(&user4_name)
        .expect("can delete existing user");

+    // Demonstrate embedded/nested indexes with Grid4 Node
+    println!("\n--- Demonstrating Embedded/Nested Indexes (Grid4::Node) ---");
+    println!("Node indexed fields: {:?}", Node::indexed_fields());
+
+    // Build a minimal node with nested data and persist it
+    let cs = ComputeSlice::new()
+        .nodeid(42)
+        .slice_id(1)
+        .mem_gb(32.0)
+        .storage_gb(512.0)
+        .passmark(6000)
+        .vcores(16)
+        .gpus(1)
+        .price_cc(0.33);
+    let dev = DeviceInfo { vendor: "ACME".into(), ..Default::default() };
+    let node = Node::new()
+        .nodegroupid(101)
+        .uptime(99)
+        .add_compute_slice(cs)
+        .devices(dev)
+        .country("BE")
+        .pubkey("EX_NODE_PK_1")
+        .build();
+    let (node_id, _stored_node) = db
+        .collection::<Node>()
+        .expect("can open node collection")
+        .set(&node)
+        .expect("can set node");
+    println!("Stored node id: {}", node_id);
+
+    // Query by top-level indexes
+    let be_nodes = db
+        .collection::<Node>()
+        .expect("can open node collection")
+        .get::<node_country, _>("BE")
+        .expect("can query nodes by country");
+    println!("Nodes in BE (count may include legacy rows): {}", be_nodes.len());
+
+    let by_pk = db
+        .collection::<Node>()
+        .expect("can open node collection")
+        .get::<node_pubkey, _>("EX_NODE_PK_1")
+        .expect("can query node by pubkey");
+    assert!(by_pk.iter().any(|n| n.get_id() == node_id));
+
+    // Note: Nested path indexes (e.g., devices.vendor, computeslices.passmark) are created and used
+    // for DB-side indexing, but are not yet exposed as typed Index keys in the API. They appear in
+    // Node::indexed_fields() and contribute to Model::db_keys(), enabling performant JSONB GIN indexes.
+
    println!("\n--- User Model Information ---");
    println!("User DB Prefix: {}", User::db_prefix());

@@ -212,7 +261,7 @@ fn main() {
    // 1. Create and save a comment
    println!("\n1. Creating a Comment:");
    let comment = Comment::new()
-        .user_id(db_user1.get_id()) // commenter's user ID
+        .user_id(db_user2.get_id()) // commenter's user ID (use an existing user)
        .content("This is a comment on the user")
        .build();

@@ -230,7 +279,7 @@ fn main() {

    // 3. Associate the comment with a user
    println!("\n2. Associating Comment with User:");
-    let mut updated_user = db_user1.clone();
+    let mut updated_user = db_user2.clone();
    updated_user.base_data.add_comment(db_comment.get_id());

    // Save the updated user and get the new version
--- a/heromodels/src/db/hero.rs
+++ b/heromodels/src/db/hero.rs
@@ -8,8 +8,8 @@ use std::{
    collections::HashSet,
    path::PathBuf,
    sync::{
-        atomic::{AtomicU32, Ordering},
        Arc, Mutex,
+        atomic::{AtomicU32, Ordering},
    },
 };

--- a/heromodels/src/models/circle/rhai.rs
+++ b/heromodels/src/models/circle/rhai.rs
@@ -1,16 +1,17 @@
 use crate::db::Db;
-use rhailib_macros::{
-    register_authorized_create_by_id_fn, register_authorized_delete_by_id_fn, register_authorized_get_by_id_fn,
-};
 use rhai::plugin::*;
 use rhai::{Array, Dynamic, Engine, EvalAltResult, Map, Module};
+use rhailib_macros::{
+    register_authorized_create_by_id_fn, register_authorized_delete_by_id_fn,
+    register_authorized_get_by_id_fn,
+};
 use std::collections::HashMap;
 use std::sync::Arc;

 use crate::models::circle::Circle;
 type RhaiCircle = Circle;
-use crate::db::hero::OurDB;
 use crate::db::Collection;
+use crate::db::hero::OurDB;
 use crate::models::circle::ThemeData;

 #[export_module]
--- a/heromodels/src/models/grid4/bid.rs
+++ b/heromodels/src/models/grid4/bid.rs
@@ -0,0 +1,128 @@
+use heromodels_core::BaseModelData;
+use heromodels_derive::model;
+use rhai::{CustomType, TypeBuilder};
+use serde::{Deserialize, Serialize};
+
+/// Bid status enumeration
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
+pub enum BidStatus {
+    #[default]
+    Pending,
+    Confirmed,
+    Assigned,
+    Cancelled,
+    Done,
+}
+
+/// Billing period enumeration
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
+pub enum BillingPeriod {
+    #[default]
+    Hourly,
+    Monthly,
+    Yearly,
+    Biannually,
+    Triannually,
+}
+
+/// I can bid for infra, and optionally get accepted
+#[model]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
+pub struct Bid {
+    pub base_data: BaseModelData,
+    /// links back to customer for this capacity (user on ledger)
+    #[index]
+    pub customer_id: u32,
+    /// nr of slices I need in 1 machine
+    pub compute_slices_nr: i32,
+    /// price per 1 GB slice I want to accept
+    pub compute_slice_price: f64,
+    /// nr of storage slices needed
+    pub storage_slices_nr: i32,
+    /// price per 1 GB storage slice I want to accept
+    pub storage_slice_price: f64,
+    pub status: BidStatus,
+    /// if obligation then will be charged and money needs to be in escrow, otherwise its an intent
+    pub obligation: bool,
+    /// epoch timestamp
+    pub start_date: u32,
+    /// epoch timestamp
+    pub end_date: u32,
+    /// signature as done by a user/consumer to validate their identity and intent
+    pub signature_user: String,
+    pub billing_period: BillingPeriod,
+}
+
+impl Bid {
+    pub fn new() -> Self {
+        Self {
+            base_data: BaseModelData::new(),
+            customer_id: 0,
+            compute_slices_nr: 0,
+            compute_slice_price: 0.0,
+            storage_slices_nr: 0,
+            storage_slice_price: 0.0,
+            status: BidStatus::default(),
+            obligation: false,
+            start_date: 0,
+            end_date: 0,
+            signature_user: String::new(),
+            billing_period: BillingPeriod::default(),
+        }
+    }
+
+    pub fn customer_id(mut self, v: u32) -> Self {
+        self.customer_id = v;
+        self
+    }
+    
+    pub fn compute_slices_nr(mut self, v: i32) -> Self {
+        self.compute_slices_nr = v;
+        self
+    }
+    
+    pub fn compute_slice_price(mut self, v: f64) -> Self {
+        self.compute_slice_price = v;
+        self
+    }
+    
+    pub fn storage_slices_nr(mut self, v: i32) -> Self {
+        self.storage_slices_nr = v;
+        self
+    }
+    
+    pub fn storage_slice_price(mut self, v: f64) -> Self {
+        self.storage_slice_price = v;
+        self
+    }
+    
+    pub fn status(mut self, v: BidStatus) -> Self {
+        self.status = v;
+        self
+    }
+    
+    pub fn obligation(mut self, v: bool) -> Self {
+        self.obligation = v;
+        self
+    }
+    
+    pub fn start_date(mut self, v: u32) -> Self {
+        self.start_date = v;
+        self
+    }
+    
+    pub fn end_date(mut self, v: u32) -> Self {
+        self.end_date = v;
+        self
+    }
+    
+    pub fn signature_user(mut self, v: impl ToString) -> Self {
+        self.signature_user = v.to_string();
+        self
+    }
+    
+    pub fn billing_period(mut self, v: BillingPeriod) -> Self {
+        self.billing_period = v;
+        self
+    }
+}
--- a/heromodels/src/models/grid4/common.rs
+++ b/heromodels/src/models/grid4/common.rs
@@ -0,0 +1,39 @@
+use rhai::{CustomType, TypeBuilder};
+use serde::{Deserialize, Serialize};
+
+/// SLA policy matching the V spec `SLAPolicy`
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
+pub struct SLAPolicy {
+    /// should +90
+    pub sla_uptime: i32,
+    /// minimal mbits we can expect avg over 1h per node, 0 means we don't guarantee
+    pub sla_bandwidth_mbit: i32,
+    /// 0-100, percent of money given back in relation to month if sla breached,
+    /// e.g. 200 means we return 2 months worth of rev if sla missed
+    pub sla_penalty: i32,
+}
+
+impl SLAPolicy {
+    pub fn new() -> Self { Self::default() }
+    pub fn sla_uptime(mut self, v: i32) -> Self { self.sla_uptime = v; self }
+    pub fn sla_bandwidth_mbit(mut self, v: i32) -> Self { self.sla_bandwidth_mbit = v; self }
+    pub fn sla_penalty(mut self, v: i32) -> Self { self.sla_penalty = v; self }
+    pub fn build(self) -> Self { self }
+}
+
+/// Pricing policy matching the V spec `PricingPolicy`
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
+pub struct PricingPolicy {
+    /// e.g. 30,40,50 means if user has more CC in wallet than 1 year utilization
+    /// then this provider gives 30%, 2Y 40%, ...
+    pub marketplace_year_discounts: Vec<i32>,
+    /// e.g. 10,20,30
+    pub volume_discounts: Vec<i32>,
+}
+
+impl PricingPolicy {
+    pub fn new() -> Self { Self { marketplace_year_discounts: vec![30, 40, 50], volume_discounts: vec![10, 20, 30] } }
+    pub fn marketplace_year_discounts(mut self, v: Vec<i32>) -> Self { self.marketplace_year_discounts = v; self }
+    pub fn volume_discounts(mut self, v: Vec<i32>) -> Self { self.volume_discounts = v; self }
+    pub fn build(self) -> Self { self }
+}
--- a/heromodels/src/models/grid4/contract.rs
+++ b/heromodels/src/models/grid4/contract.rs
@@ -0,0 +1,219 @@
+use heromodels_core::BaseModelData;
+use heromodels_derive::model;
+use rhai::{CustomType, TypeBuilder};
+use serde::{Deserialize, Serialize};
+use super::bid::BillingPeriod;
+
+/// Contract status enumeration
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
+pub enum ContractStatus {
+    #[default]
+    Active,
+    Cancelled,
+    Error,
+    Paused,
+}
+
+/// Compute slice provisioned for a contract
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
+pub struct ComputeSliceProvisioned {
+    pub node_id: u32,
+    /// the id of the slice in the node
+    pub id: u16,
+    pub mem_gb: f64,
+    pub storage_gb: f64,
+    pub passmark: i32,
+    pub vcores: i32,
+    pub cpu_oversubscription: i32,
+    pub tags: String,
+}
+
+/// Storage slice provisioned for a contract
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
+pub struct StorageSliceProvisioned {
+    pub node_id: u32,
+    /// the id of the slice in the node, are tracked in the node itself
+    pub id: u16,
+    pub storage_size_gb: i32,
+    pub tags: String,
+}
+
+/// Contract for provisioned infrastructure
+#[model]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
+pub struct Contract {
+    pub base_data: BaseModelData,
+    /// links back to customer for this capacity (user on ledger)
+    #[index]
+    pub customer_id: u32,
+    pub compute_slices: Vec<ComputeSliceProvisioned>,
+    pub storage_slices: Vec<StorageSliceProvisioned>,
+    /// price per 1 GB agreed upon
+    pub compute_slice_price: f64,
+    /// price per 1 GB agreed upon
+    pub storage_slice_price: f64,
+    /// price per 1 GB agreed upon (transfer)
+    pub network_slice_price: f64,
+    pub status: ContractStatus,
+    /// epoch timestamp
+    pub start_date: u32,
+    /// epoch timestamp
+    pub end_date: u32,
+    /// signature as done by a user/consumer to validate their identity and intent
+    pub signature_user: String,
+    /// signature as done by the hoster
+    pub signature_hoster: String,
+    pub billing_period: BillingPeriod,
+}
+
+impl Contract {
+    pub fn new() -> Self {
+        Self {
+            base_data: BaseModelData::new(),
+            customer_id: 0,
+            compute_slices: Vec::new(),
+            storage_slices: Vec::new(),
+            compute_slice_price: 0.0,
+            storage_slice_price: 0.0,
+            network_slice_price: 0.0,
+            status: ContractStatus::default(),
+            start_date: 0,
+            end_date: 0,
+            signature_user: String::new(),
+            signature_hoster: String::new(),
+            billing_period: BillingPeriod::default(),
+        }
+    }
+
+    pub fn customer_id(mut self, v: u32) -> Self {
+        self.customer_id = v;
+        self
+    }
+    
+    pub fn add_compute_slice(mut self, slice: ComputeSliceProvisioned) -> Self {
+        self.compute_slices.push(slice);
+        self
+    }
+    
+    pub fn add_storage_slice(mut self, slice: StorageSliceProvisioned) -> Self {
+        self.storage_slices.push(slice);
+        self
+    }
+    
+    pub fn compute_slice_price(mut self, v: f64) -> Self {
+        self.compute_slice_price = v;
+        self
+    }
+    
+    pub fn storage_slice_price(mut self, v: f64) -> Self {
+        self.storage_slice_price = v;
+        self
+    }
+    
+    pub fn network_slice_price(mut self, v: f64) -> Self {
+        self.network_slice_price = v;
+        self
+    }
+    
+    pub fn status(mut self, v: ContractStatus) -> Self {
+        self.status = v;
+        self
+    }
+    
+    pub fn start_date(mut self, v: u32) -> Self {
+        self.start_date = v;
+        self
+    }
+    
+    pub fn end_date(mut self, v: u32) -> Self {
+        self.end_date = v;
+        self
+    }
+    
+    pub fn signature_user(mut self, v: impl ToString) -> Self {
+        self.signature_user = v.to_string();
+        self
+    }
+    
+    pub fn signature_hoster(mut self, v: impl ToString) -> Self {
+        self.signature_hoster = v.to_string();
+        self
+    }
+    
+    pub fn billing_period(mut self, v: BillingPeriod) -> Self {
+        self.billing_period = v;
+        self
+    }
+}
+
+impl ComputeSliceProvisioned {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    
+    pub fn node_id(mut self, v: u32) -> Self {
+        self.node_id = v;
+        self
+    }
+    
+    pub fn id(mut self, v: u16) -> Self {
+        self.id = v;
+        self
+    }
+    
+    pub fn mem_gb(mut self, v: f64) -> Self {
+        self.mem_gb = v;
+        self
+    }
+    
+    pub fn storage_gb(mut self, v: f64) -> Self {
+        self.storage_gb = v;
+        self
+    }
+    
+    pub fn passmark(mut self, v: i32) -> Self {
+        self.passmark = v;
+        self
+    }
+    
+    pub fn vcores(mut self, v: i32) -> Self {
+        self.vcores = v;
+        self
+    }
+    
+    pub fn cpu_oversubscription(mut self, v: i32) -> Self {
+        self.cpu_oversubscription = v;
+        self
+    }
+    
+    pub fn tags(mut self, v: impl ToString) -> Self {
+        self.tags = v.to_string();
+        self
+    }
+}
+
+impl StorageSliceProvisioned {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    
+    pub fn node_id(mut self, v: u32) -> Self {
+        self.node_id = v;
+        self
+    }
+    
+    pub fn id(mut self, v: u16) -> Self {
+        self.id = v;
+        self
+    }
+    
+    pub fn storage_size_gb(mut self, v: i32) -> Self {
+        self.storage_size_gb = v;
+        self
+    }
+    
+    pub fn tags(mut self, v: impl ToString) -> Self {
+        self.tags = v.to_string();
+        self
+    }
+}
--- a/heromodels/src/models/grid4/mod.rs
+++ b/heromodels/src/models/grid4/mod.rs
@@ -1,16 +1,18 @@
+pub mod bid;
+pub mod common;
+pub mod contract;
 pub mod node;
+pub mod nodegroup;
+pub mod reputation;
+pub mod reservation;

+pub use bid::{Bid, BidStatus, BillingPeriod};
+pub use common::{PricingPolicy, SLAPolicy};
+pub use contract::{Contract, ContractStatus, ComputeSliceProvisioned, StorageSliceProvisioned};
 pub use node::{
-    Node,
-    DeviceInfo,
-    StorageDevice,
-    MemoryDevice,
-    CPUDevice,
-    GPUDevice,
-    NetworkDevice,
-    NodeCapacity,
-    ComputeSlice,
-    StorageSlice,
-    PricingPolicy,
-    SLAPolicy,
+    CPUDevice, ComputeSlice, DeviceInfo, GPUDevice, MemoryDevice, NetworkDevice, Node,
+    NodeCapacity, StorageDevice, StorageSlice,
 };
+pub use nodegroup::NodeGroup;
+pub use reputation::{NodeGroupReputation, NodeReputation};
+pub use reservation::{Reservation, ReservationStatus};
--- a/heromodels/src/models/grid4/node.rs
+++ b/heromodels/src/models/grid4/node.rs
@@ -1,7 +1,8 @@
 use heromodels_core::BaseModelData;
 use heromodels_derive::model;
-use rhai::CustomType;
+use rhai::{CustomType, TypeBuilder};
 use serde::{Deserialize, Serialize};
+use super::common::{PricingPolicy, SLAPolicy};

 /// Storage device information
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
@@ -94,57 +95,26 @@ pub struct NodeCapacity {
    pub vcores: i32,
 }

-/// Pricing policy for slices (minimal version until full spec available)
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
-pub struct PricingPolicy {
-    /// Human friendly policy name (e.g. "fixed", "market")
-    pub name: String,
-    /// Optional free-form details as JSON-encoded string
-    pub details: Option<String>,
-}
-
-/// SLA policy for slices (minimal version until full spec available)
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
-pub struct SLAPolicy {
-    /// Uptime in percentage (0..100)
-    pub uptime: f32,
-    /// Max response time in ms
-    pub max_response_time_ms: u32,
-}
+// PricingPolicy and SLAPolicy moved to `common.rs` to be shared across models.

 /// Compute slice (typically represents a base unit of compute)
-#[model]
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
 pub struct ComputeSlice {
-    pub base_data: BaseModelData,
-    /// the node in the grid, there is an object describing the node
-    #[index]
-    pub nodeid: u32,
    /// the id of the slice in the node
-    #[index]
-    pub id: i32,
+    pub id: u16,
    pub mem_gb: f64,
    pub storage_gb: f64,
    pub passmark: i32,
    pub vcores: i32,
    pub cpu_oversubscription: i32,
    pub storage_oversubscription: i32,
-    /// Min/max allowed price range for validation
-    #[serde(default)]
-    pub price_range: Vec<f64>,
    /// nr of GPU's see node to know what GPU's are
    pub gpus: u8,
-    /// price per slice (even if the grouped one)
-    pub price_cc: f64,
-    pub pricing_policy: PricingPolicy,
-    pub sla_policy: SLAPolicy,
 }

 impl ComputeSlice {
    pub fn new() -> Self {
        Self {
-            base_data: BaseModelData::new(),
-            nodeid: 0,
            id: 0,
            mem_gb: 0.0,
            storage_gb: 0.0,
@@ -152,63 +122,62 @@ impl ComputeSlice {
            vcores: 0,
            cpu_oversubscription: 0,
            storage_oversubscription: 0,
-            price_range: vec![0.0, 0.0],
            gpus: 0,
-            price_cc: 0.0,
-            pricing_policy: PricingPolicy::default(),
-            sla_policy: SLAPolicy::default(),
        }
    }

-    pub fn nodeid(mut self, nodeid: u32) -> Self { self.nodeid = nodeid; self }
-    pub fn slice_id(mut self, id: i32) -> Self { self.id = id; self }
-    pub fn mem_gb(mut self, v: f64) -> Self { self.mem_gb = v; self }
-    pub fn storage_gb(mut self, v: f64) -> Self { self.storage_gb = v; self }
-    pub fn passmark(mut self, v: i32) -> Self { self.passmark = v; self }
-    pub fn vcores(mut self, v: i32) -> Self { self.vcores = v; self }
-    pub fn cpu_oversubscription(mut self, v: i32) -> Self { self.cpu_oversubscription = v; self }
-    pub fn storage_oversubscription(mut self, v: i32) -> Self { self.storage_oversubscription = v; self }
-    pub fn price_range(mut self, min_max: Vec<f64>) -> Self { self.price_range = min_max; self }
-    pub fn gpus(mut self, v: u8) -> Self { self.gpus = v; self }
-    pub fn price_cc(mut self, v: f64) -> Self { self.price_cc = v; self }
-    pub fn pricing_policy(mut self, p: PricingPolicy) -> Self { self.pricing_policy = p; self }
-    pub fn sla_policy(mut self, p: SLAPolicy) -> Self { self.sla_policy = p; self }
+    pub fn id(mut self, id: u16) -> Self {
+        self.id = id;
+        self
+    }
+    pub fn mem_gb(mut self, v: f64) -> Self {
+        self.mem_gb = v;
+        self
+    }
+    pub fn storage_gb(mut self, v: f64) -> Self {
+        self.storage_gb = v;
+        self
+    }
+    pub fn passmark(mut self, v: i32) -> Self {
+        self.passmark = v;
+        self
+    }
+    pub fn vcores(mut self, v: i32) -> Self {
+        self.vcores = v;
+        self
+    }
+    pub fn cpu_oversubscription(mut self, v: i32) -> Self {
+        self.cpu_oversubscription = v;
+        self
+    }
+    pub fn storage_oversubscription(mut self, v: i32) -> Self {
+        self.storage_oversubscription = v;
+        self
+    }
+    pub fn gpus(mut self, v: u8) -> Self {
+        self.gpus = v;
+        self
+    }
 }

 /// Storage slice (typically 1GB of storage)
-#[model]
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
 pub struct StorageSlice {
-    pub base_data: BaseModelData,
-    /// the node in the grid
-    #[index]
-    pub nodeid: u32,
    /// the id of the slice in the node, are tracked in the node itself
-    #[index]
-    pub id: i32,
-    /// price per slice (even if the grouped one)
-    pub price_cc: f64,
-    pub pricing_policy: PricingPolicy,
-    pub sla_policy: SLAPolicy,
+    pub id: u16,
 }

 impl StorageSlice {
    pub fn new() -> Self {
        Self {
-            base_data: BaseModelData::new(),
-            nodeid: 0,
            id: 0,
-            price_cc: 0.0,
-            pricing_policy: PricingPolicy::default(),
-            sla_policy: SLAPolicy::default(),
        }
    }

-    pub fn nodeid(mut self, nodeid: u32) -> Self { self.nodeid = nodeid; self }
-    pub fn slice_id(mut self, id: i32) -> Self { self.id = id; self }
-    pub fn price_cc(mut self, v: f64) -> Self { self.price_cc = v; self }
-    pub fn pricing_policy(mut self, p: PricingPolicy) -> Self { self.pricing_policy = p; self }
-    pub fn sla_policy(mut self, p: SLAPolicy) -> Self { self.sla_policy = p; self }
+    pub fn id(mut self, id: u16) -> Self {
+        self.id = id;
+        self
+    }
 }

 /// Grid4 Node model
@@ -224,13 +193,20 @@ pub struct Node {
    pub computeslices: Vec<ComputeSlice>,
    pub storageslices: Vec<StorageSlice>,
    pub devices: DeviceInfo,
-    /// 2 letter code
+    /// 2 letter code as specified in lib/data/countries/data/countryInfo.txt
    #[index]
    pub country: String,
    /// Hardware capacity details
    pub capacity: NodeCapacity,
-    /// lets keep it simple and compatible
-    pub provisiontime: u32,
+    /// first time node was active
+    pub birthtime: u32,
+    /// node public key
+    #[index]
+    pub pubkey: String,
+    /// signature done on node to validate pubkey with privkey
+    pub signature_node: String,
+    /// signature as done by farmers to validate their identity
+    pub signature_farmer: String,
 }

 impl Node {
@@ -244,21 +220,61 @@ impl Node {
            devices: DeviceInfo::default(),
            country: String::new(),
            capacity: NodeCapacity::default(),
-            provisiontime: 0,
+            birthtime: 0,
+            pubkey: String::new(),
+            signature_node: String::new(),
+            signature_farmer: String::new(),
        }
    }

-    pub fn nodegroupid(mut self, v: i32) -> Self { self.nodegroupid = v; self }
-    pub fn uptime(mut self, v: i32) -> Self { self.uptime = v; self }
-    pub fn add_compute_slice(mut self, s: ComputeSlice) -> Self { self.computeslices.push(s); self }
-    pub fn add_storage_slice(mut self, s: StorageSlice) -> Self { self.storageslices.push(s); self }
-    pub fn devices(mut self, d: DeviceInfo) -> Self { self.devices = d; self }
-    pub fn country(mut self, c: impl ToString) -> Self { self.country = c.to_string(); self }
-    pub fn capacity(mut self, c: NodeCapacity) -> Self { self.capacity = c; self }
-    pub fn provisiontime(mut self, t: u32) -> Self { self.provisiontime = t; self }
+    pub fn nodegroupid(mut self, v: i32) -> Self {
+        self.nodegroupid = v;
+        self
+    }
+    pub fn uptime(mut self, v: i32) -> Self {
+        self.uptime = v;
+        self
+    }
+    pub fn add_compute_slice(mut self, s: ComputeSlice) -> Self {
+        self.computeslices.push(s);
+        self
+    }
+    pub fn add_storage_slice(mut self, s: StorageSlice) -> Self {
+        self.storageslices.push(s);
+        self
+    }
+    pub fn devices(mut self, d: DeviceInfo) -> Self {
+        self.devices = d;
+        self
+    }
+    pub fn country(mut self, c: impl ToString) -> Self {
+        self.country = c.to_string();
+        self
+    }
+    pub fn capacity(mut self, c: NodeCapacity) -> Self {
+        self.capacity = c;
+        self
+    }
+    pub fn birthtime(mut self, t: u32) -> Self {
+        self.birthtime = t;
+        self
+    }
+
+    pub fn pubkey(mut self, v: impl ToString) -> Self {
+        self.pubkey = v.to_string();
+        self
+    }
+    pub fn signature_node(mut self, v: impl ToString) -> Self {
+        self.signature_node = v.to_string();
+        self
+    }
+    pub fn signature_farmer(mut self, v: impl ToString) -> Self {
+        self.signature_farmer = v.to_string();
+        self
+    }

    /// Placeholder for capacity recalculation out of the devices on the Node
-    pub fn recalc_capacity(mut self) -> Self {
+    pub fn check(self) -> Self {
        // TODO: calculate NodeCapacity out of the devices on the Node
        self
    }
--- a/heromodels/src/models/grid4/nodegroup.rs
+++ b/heromodels/src/models/grid4/nodegroup.rs
@@ -0,0 +1,52 @@
+use heromodels_core::BaseModelData;
+use heromodels_derive::model;
+use rhai::{CustomType, TypeBuilder};
+use serde::{Deserialize, Serialize};
+
+use super::common::{PricingPolicy, SLAPolicy};
+
+/// Grid4 NodeGroup model (root object for farmer configuration)
+#[model]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
+pub struct NodeGroup {
+    pub base_data: BaseModelData,
+    /// link back to farmer who owns the nodegroup, is a user?
+    #[index]
+    pub farmerid: u32,
+    /// only visible by farmer, in future encrypted, used to boot a node
+    pub secret: String,
+    pub description: String,
+    pub slapolicy: SLAPolicy,
+    pub pricingpolicy: PricingPolicy,
+    /// pricing in CC - cloud credit, per 2GB node slice
+    pub compute_slice_normalized_pricing_cc: f64,
+    /// pricing in CC - cloud credit, per 1GB storage slice
+    pub storage_slice_normalized_pricing_cc: f64,
+    /// signature as done by farmers to validate that they created this group
+    pub signature_farmer: String,
+}
+
+impl NodeGroup {
+    pub fn new() -> Self {
+        Self {
+            base_data: BaseModelData::new(),
+            farmerid: 0,
+            secret: String::new(),
+            description: String::new(),
+            slapolicy: SLAPolicy::default(),
+            pricingpolicy: PricingPolicy::new(),
+            compute_slice_normalized_pricing_cc: 0.0,
+            storage_slice_normalized_pricing_cc: 0.0,
+            signature_farmer: String::new(),
+        }
+    }
+
+    pub fn farmerid(mut self, v: u32) -> Self { self.farmerid = v; self }
+    pub fn secret(mut self, v: impl ToString) -> Self { self.secret = v.to_string(); self }
+    pub fn description(mut self, v: impl ToString) -> Self { self.description = v.to_string(); self }
+    pub fn slapolicy(mut self, v: SLAPolicy) -> Self { self.slapolicy = v; self }
+    pub fn pricingpolicy(mut self, v: PricingPolicy) -> Self { self.pricingpolicy = v; self }
+    pub fn compute_slice_normalized_pricing_cc(mut self, v: f64) -> Self { self.compute_slice_normalized_pricing_cc = v; self }
+    pub fn storage_slice_normalized_pricing_cc(mut self, v: f64) -> Self { self.storage_slice_normalized_pricing_cc = v; self }
+    pub fn signature_farmer(mut self, v: impl ToString) -> Self { self.signature_farmer = v.to_string(); self }
+}
--- a/heromodels/src/models/grid4/reputation.rs
+++ b/heromodels/src/models/grid4/reputation.rs
@@ -0,0 +1,85 @@
+use heromodels_core::BaseModelData;
+use heromodels_derive::model;
+use rhai::{CustomType, TypeBuilder};
+use serde::{Deserialize, Serialize};
+
+/// Node reputation information
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
+pub struct NodeReputation {
+    pub node_id: u32,
+    /// between 0 and 100, earned over time
+    pub reputation: i32,
+    /// between 0 and 100, set by system, farmer has no ability to set this
+    pub uptime: i32,
+}
+
+/// NodeGroup reputation model
+#[model]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
+pub struct NodeGroupReputation {
+    pub base_data: BaseModelData,
+    #[index]
+    pub nodegroup_id: u32,
+    /// between 0 and 100, earned over time
+    pub reputation: i32,
+    /// between 0 and 100, set by system, farmer has no ability to set this
+    pub uptime: i32,
+    pub nodes: Vec<NodeReputation>,
+}
+
+impl NodeGroupReputation {
+    pub fn new() -> Self {
+        Self {
+            base_data: BaseModelData::new(),
+            nodegroup_id: 0,
+            reputation: 50, // default as per spec
+            uptime: 0,
+            nodes: Vec::new(),
+        }
+    }
+
+    pub fn nodegroup_id(mut self, v: u32) -> Self {
+        self.nodegroup_id = v;
+        self
+    }
+    
+    pub fn reputation(mut self, v: i32) -> Self {
+        self.reputation = v;
+        self
+    }
+    
+    pub fn uptime(mut self, v: i32) -> Self {
+        self.uptime = v;
+        self
+    }
+    
+    pub fn add_node_reputation(mut self, node_rep: NodeReputation) -> Self {
+        self.nodes.push(node_rep);
+        self
+    }
+}
+
+impl NodeReputation {
+    pub fn new() -> Self {
+        Self {
+            node_id: 0,
+            reputation: 50, // default as per spec
+            uptime: 0,
+        }
+    }
+    
+    pub fn node_id(mut self, v: u32) -> Self {
+        self.node_id = v;
+        self
+    }
+    
+    pub fn reputation(mut self, v: i32) -> Self {
+        self.reputation = v;
+        self
+    }
+    
+    pub fn uptime(mut self, v: i32) -> Self {
+        self.uptime = v;
+        self
+    }
+}
--- a/heromodels/src/models/grid4/reservation.rs
+++ b/heromodels/src/models/grid4/reservation.rs
@@ -0,0 +1,58 @@
+use heromodels_core::BaseModelData;
+use heromodels_derive::model;
+use rhai::{CustomType, TypeBuilder};
+use serde::{Deserialize, Serialize};
+
+/// Reservation status as per V spec
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
+pub enum ReservationStatus {
+    #[default]
+    Pending,
+    Confirmed,
+    Assigned,
+    Cancelled,
+    Done,
+}
+
+/// Grid4 Reservation model
+#[model]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default, CustomType)]
+pub struct Reservation {
+    pub base_data: BaseModelData,
+    /// links back to customer for this capacity
+    #[index]
+    pub customer_id: u32,
+    pub compute_slices: Vec<u32>,
+    pub storage_slices: Vec<u32>,
+    pub status: ReservationStatus,
+    /// if obligation then will be charged and money needs to be in escrow, otherwise its an intent
+    pub obligation: bool,
+    /// epoch
+    pub start_date: u32,
+    pub end_date: u32,
+}
+
+impl Reservation {
+    pub fn new() -> Self {
+        Self {
+            base_data: BaseModelData::new(),
+            customer_id: 0,
+            compute_slices: Vec::new(),
+            storage_slices: Vec::new(),
+            status: ReservationStatus::Pending,
+            obligation: false,
+            start_date: 0,
+            end_date: 0,
+        }
+    }
+
+    pub fn customer_id(mut self, v: u32) -> Self { self.customer_id = v; self }
+    pub fn add_compute_slice(mut self, id: u32) -> Self { self.compute_slices.push(id); self }
+    pub fn compute_slices(mut self, v: Vec<u32>) -> Self { self.compute_slices = v; self }
+    pub fn add_storage_slice(mut self, id: u32) -> Self { self.storage_slices.push(id); self }
+    pub fn storage_slices(mut self, v: Vec<u32>) -> Self { self.storage_slices = v; self }
+    pub fn status(mut self, v: ReservationStatus) -> Self { self.status = v; self }
+    pub fn obligation(mut self, v: bool) -> Self { self.obligation = v; self }
+    pub fn start_date(mut self, v: u32) -> Self { self.start_date = v; self }
+    pub fn end_date(mut self, v: u32) -> Self { self.end_date = v; self }
+}
--- a/heromodels/src/models/grid4/specs/README.md
+++ b/heromodels/src/models/grid4/specs/README.md
@@ -0,0 +1,194 @@
+
+# Grid4 Data Model
+
+This module defines data models for nodes, groups, and slices in a cloud/grid infrastructure. Each root object is marked with `@[heap]` and can be indexed for efficient querying.
+
+## Root Objects Overview
+
+| Object      | Description                                   | Index Fields                   |
+| ----------- | --------------------------------------------- | ------------------------------ |
+| `Node`      | Represents a single node in the grid          | `id`, `nodegroupid`, `country` |
+| `NodeGroup` | Represents a group of nodes owned by a farmer | `id`, `farmerid`               |
+
+---
+
+## Node
+
+Represents a single node in the grid with slices, devices, and capacity.
+
+| Field           | Type             | Description                                  | Indexed |
+| --------------- | ---------------- | -------------------------------------------- | ------- |
+| `id`            | `int`            | Unique node ID                               | ✅       |
+| `nodegroupid`   | `int`            | ID of the owning node group                  | ✅       |
+| `uptime`        | `int`            | Uptime percentage (0-100)                    | ✅       |
+| `computeslices` | `[]ComputeSlice` | List of compute slices                       | ❌       |
+| `storageslices` | `[]StorageSlice` | List of storage slices                       | ❌       |
+| `devices`       | `DeviceInfo`     | Hardware device info (storage, memory, etc.) | ❌       |
+| `country`       | `string`         | 2-letter country code                        | ✅       |
+| `capacity`      | `NodeCapacity`   | Aggregated hardware capacity                 | ❌       |
+| `provisiontime` | `u32`            | Provisioning time (simple/compatible format) | ✅       |
+
+---
+
+## NodeGroup
+
+Represents a group of nodes owned by a farmer, with policies.
+
+| Field                                 | Type            | Description                                    | Indexed |
+| ------------------------------------- | --------------- | ---------------------------------------------- | ------- |
+| `id`                                  | `u32`           | Unique group ID                                | ✅       |
+| `farmerid`                            | `u32`           | Farmer/user ID                                 | ✅       |
+| `secret`                              | `string`        | Encrypted secret for booting nodes             | ❌       |
+| `description`                         | `string`        | Group description                              | ❌       |
+| `slapolicy`                           | `SLAPolicy`     | SLA policy details                             | ❌       |
+| `pricingpolicy`                       | `PricingPolicy` | Pricing policy details                         | ❌       |
+| `compute_slice_normalized_pricing_cc` | `f64`           | Pricing per 2GB compute slice in cloud credits | ❌       |
+| `storage_slice_normalized_pricing_cc` | `f64`           | Pricing per 1GB storage slice in cloud credits | ❌       |
+| `reputation`                          | `int`           | Reputation (0-100)                             | ✅       |
+| `uptime`                              | `int`           | Uptime (0-100)                                 | ✅       |
+
+---
+
+## ComputeSlice
+
+Represents a compute slice (e.g., 1GB memory unit).
+
+| Field                      | Type            | Description                      |
+| -------------------------- | --------------- | -------------------------------- |
+| `nodeid`                   | `u32`           | Owning node ID                   |
+| `id`                       | `int`           | Slice ID in node                 |
+| `mem_gb`                   | `f64`           | Memory in GB                     |
+| `storage_gb`               | `f64`           | Storage in GB                    |
+| `passmark`                 | `int`           | Passmark score                   |
+| `vcores`                   | `int`           | Virtual cores                    |
+| `cpu_oversubscription`     | `int`           | CPU oversubscription ratio       |
+| `storage_oversubscription` | `int`           | Storage oversubscription ratio   |
+| `price_range`              | `[]f64`         | Price range [min, max]           |
+| `gpus`                     | `u8`            | Number of GPUs                   |
+| `price_cc`                 | `f64`           | Price per slice in cloud credits |
+| `pricing_policy`           | `PricingPolicy` | Pricing policy                   |
+| `sla_policy`               | `SLAPolicy`     | SLA policy                       |
+
+---
+
+## StorageSlice
+
+Represents a 1GB storage slice.
+
+| Field            | Type            | Description                      |
+| ---------------- | --------------- | -------------------------------- |
+| `nodeid`         | `u32`           | Owning node ID                   |
+| `id`             | `int`           | Slice ID in node                 |
+| `price_cc`       | `f64`           | Price per slice in cloud credits |
+| `pricing_policy` | `PricingPolicy` | Pricing policy                   |
+| `sla_policy`     | `SLAPolicy`     | SLA policy                       |
+
+---
+
+## DeviceInfo
+
+Hardware device information for a node.
+
+| Field     | Type              | Description             |
+| --------- | ----------------- | ----------------------- |
+| `vendor`  | `string`          | Vendor of the node      |
+| `storage` | `[]StorageDevice` | List of storage devices |
+| `memory`  | `[]MemoryDevice`  | List of memory devices  |
+| `cpu`     | `[]CPUDevice`     | List of CPU devices     |
+| `gpu`     | `[]GPUDevice`     | List of GPU devices     |
+| `network` | `[]NetworkDevice` | List of network devices |
+
+---
+
+## StorageDevice
+
+| Field         | Type     | Description           |
+| ------------- | -------- | --------------------- |
+| `id`          | `string` | Unique ID for device  |
+| `size_gb`     | `f64`    | Size in GB            |
+| `description` | `string` | Description of device |
+
+---
+
+## MemoryDevice
+
+| Field         | Type     | Description           |
+| ------------- | -------- | --------------------- |
+| `id`          | `string` | Unique ID for device  |
+| `size_gb`     | `f64`    | Size in GB            |
+| `description` | `string` | Description of device |
+
+---
+
+## CPUDevice
+
+| Field         | Type     | Description              |
+| ------------- | -------- | ------------------------ |
+| `id`          | `string` | Unique ID for device     |
+| `cores`       | `int`    | Number of CPU cores      |
+| `passmark`    | `int`    | Passmark benchmark score |
+| `description` | `string` | Description of device    |
+| `cpu_brand`   | `string` | Brand of the CPU         |
+| `cpu_version` | `string` | Version of the CPU       |
+
+---
+
+## GPUDevice
+
+| Field         | Type     | Description           |
+| ------------- | -------- | --------------------- |
+| `id`          | `string` | Unique ID for device  |
+| `cores`       | `int`    | Number of GPU cores   |
+| `memory_gb`   | `f64`    | GPU memory in GB      |
+| `description` | `string` | Description of device |
+| `gpu_brand`   | `string` | Brand of the GPU      |
+| `gpu_version` | `string` | Version of the GPU    |
+
+---
+
+## NetworkDevice
+
+| Field         | Type     | Description           |
+| ------------- | -------- | --------------------- |
+| `id`          | `string` | Unique ID for device  |
+| `speed_mbps`  | `int`    | Network speed in Mbps |
+| `description` | `string` | Description of device |
+
+---
+
+## NodeCapacity
+
+Aggregated hardware capacity for a node.
+
+| Field        | Type  | Description            |
+| ------------ | ----- | ---------------------- |
+| `storage_gb` | `f64` | Total storage in GB    |
+| `mem_gb`     | `f64` | Total memory in GB     |
+| `mem_gb_gpu` | `f64` | Total GPU memory in GB |
+| `passmark`   | `int` | Total passmark score   |
+| `vcores`     | `int` | Total virtual cores    |
+
+---
+
+## SLAPolicy
+
+Service Level Agreement policy for slices or node groups.
+
+| Field                | Type  | Description                             |
+| -------------------- | ----- | --------------------------------------- |
+| `sla_uptime`         | `int` | Required uptime % (e.g., 90)            |
+| `sla_bandwidth_mbit` | `int` | Guaranteed bandwidth in Mbps (0 = none) |
+| `sla_penalty`        | `int` | Penalty % if SLA is breached (0-100)    |
+
+---
+
+## PricingPolicy
+
+Pricing policy for slices or node groups.
+
+| Field                        | Type    | Description                                               |
+| ---------------------------- | ------- | --------------------------------------------------------- |
+| `marketplace_year_discounts` | `[]int` | Discounts for 1Y, 2Y, 3Y prepaid usage (e.g. [30,40,50])  |
+| `volume_discounts`           | `[]int` | Volume discounts based on purchase size (e.g. [10,20,30]) |
+
+
--- a/heromodels/src/models/grid4/specs/model_bid.v
+++ b/heromodels/src/models/grid4/specs/model_bid.v
@@ -0,0 +1,37 @@
+module datamodel
+
+// I can bid for infra, and optionally get accepted
+@[heap]
+pub struct Bid {
+pub mut:
+	id                u32
+	customer_id       u32 // links back to customer for this capacity (user on ledger)
+	compute_slices_nr int // nr of slices I need in 1 machine
+	compute_slice_price     f64 // price per 1 GB slice I want to accept
+	storage_slices_nr int
+	storage_slice_price     f64 // price per 1 GB storage slice I want to accept
+	storage_slices_nr int
+	status            BidStatus
+	obligation        bool // if obligation then will be charged and money needs to be in escrow, otherwise its an intent
+	start_date        u32  // epoch
+	end_date          u32
+	signature_user    string // signature as done by a user/consumer to validate their identity and intent
+	billing_period    BillingPeriod
+}
+
+pub enum BidStatus {
+	pending
+	confirmed
+	assigned
+	cancelled
+	done
+}
+
+
+pub enum BillingPeriod {
+	hourly
+	monthly
+	yearly
+	biannually
+	triannually 
+}
--- a/heromodels/src/models/grid4/specs/model_contract.v
+++ b/heromodels/src/models/grid4/specs/model_contract.v
@@ -0,0 +1,52 @@
+module datamodel
+
+// I can bid for infra, and optionally get accepted
+@[heap]
+pub struct Contract {
+pub mut:
+	id                u32
+	customer_id       u32 // links back to customer for this capacity (user on ledger)
+	compute_slices     []ComputeSliceProvisioned
+	storage_slices     []StorageSliceProvisioned
+	compute_slice_price     f64 // price per 1 GB agreed upon
+	storage_slice_price     f64 // price per 1 GB agreed upon
+	network_slice_price     f64 // price per 1 GB agreed upon (transfer)
+	status            ContractStatus
+	start_date        u32  // epoch
+	end_date          u32
+	signature_user    string // signature as done by a user/consumer to validate their identity and intent
+	signature_hoster  string // signature as done by the hoster
+	billing_period    BillingPeriod
+}
+
+pub enum ConctractStatus {
+	active
+	cancelled
+	error
+	paused
+}
+
+
+// typically 1GB of memory, but can be adjusted based based on size of machine
+pub struct ComputeSliceProvisioned {
+pub mut:
+	node_id					 u32
+	id                       u16 // the id of the slice in the node
+	mem_gb                   f64
+	storage_gb               f64
+	passmark                 int
+	vcores                   int
+	cpu_oversubscription     int
+	tags string
+}
+
+// 1GB of storage
+pub struct StorageSliceProvisioned {
+pub mut:
+	node_id		   u32
+	id             u16 // the id of the slice in the node, are tracked in the node itself
+	storage_size_gb int
+	tags string
+}
+
+
--- a/heromodels/src/models/grid4/specs/model_node.v
+++ b/heromodels/src/models/grid4/specs/model_node.v
@@ -0,0 +1,104 @@
+module datamodel
+
+//ACCESS ONLY TF
+
+@[heap]
+pub struct Node {
+pub mut:
+	id               int
+	nodegroupid      int
+	uptime           int // 0..100
+	computeslices    []ComputeSlice
+	storageslices    []StorageSlice
+	devices          DeviceInfo
+	country          string       // 2 letter code as specified in lib/data/countries/data/countryInfo.txt, use that library for validation
+	capacity         NodeCapacity // Hardware capacity details
+	birthtime    	 u32          // first time node was active
+	pubkey           string
+	signature_node   string // signature done on node to validate pubkey with privkey
+	signature_farmer string // signature as done by farmers to validate their identity
+}
+
+pub struct DeviceInfo {
+pub mut:
+	vendor  string
+	storage []StorageDevice
+	memory  []MemoryDevice
+	cpu     []CPUDevice
+	gpu     []GPUDevice
+	network []NetworkDevice
+}
+
+pub struct StorageDevice {
+pub mut:
+	id          string // can be used in node
+	size_gb     f64    // Size of the storage device in gigabytes
+	description string // Description of the storage device
+}
+
+pub struct MemoryDevice {
+pub mut:
+	id          string // can be used in node
+	size_gb     f64    // Size of the memory device in gigabytes
+	description string // Description of the memory device
+}
+
+pub struct CPUDevice {
+pub mut:
+	id          string // can be used in node
+	cores       int    // Number of CPU cores
+	passmark    int
+	description string // Description of the CPU
+	cpu_brand   string // Brand of the CPU
+	cpu_version string // Version of the CPU
+}
+
+pub struct GPUDevice {
+pub mut:
+	id          string // can be used in node
+	cores       int    // Number of GPU cores
+	memory_gb   f64    // Size of the GPU memory in gigabytes
+	description string // Description of the GPU
+	gpu_brand   string
+	gpu_version string
+}
+
+pub struct NetworkDevice {
+pub mut:
+	id          string // can be used in node
+	speed_mbps  int    // Network speed in Mbps
+	description string // Description of the network device
+}
+
+// NodeCapacity represents the hardware capacity details of a node.
+pub struct NodeCapacity {
+pub mut:
+	storage_gb f64 // Total storage in gigabytes
+	mem_gb     f64 // Total memory in gigabytes
+	mem_gb_gpu f64 // Total GPU memory in gigabytes
+	passmark   int // Passmark score for the node
+	vcores     int // Total virtual cores
+}
+
+// typically 1GB of memory, but can be adjusted based based on size of machine
+pub struct ComputeSlice {
+pub mut:
+	u16                       int // the id of the slice in the node
+	mem_gb                   f64
+	storage_gb               f64
+	passmark                 int
+	vcores                   int
+	cpu_oversubscription     int
+	storage_oversubscription int
+	gpus                     u8  // nr of GPU's see node to know what GPU's are
+}
+
+// 1GB of storage
+pub struct StorageSlice {
+pub mut:
+	u16             int // the id of the slice in the node, are tracked in the node itself
+}
+
+fn (mut n Node) check() ! {
+	// todo calculate NodeCapacity out of the devices on the Node
+}
--- a/heromodels/src/models/grid4/specs/model_nodegroup.v
+++ b/heromodels/src/models/grid4/specs/model_nodegroup.v
@@ -0,0 +1,33 @@
+module datamodel
+
+// is a root object, is the only obj farmer needs to configure in the UI, this defines how slices will be created
+@[heap]
+pub struct NodeGroup {
+pub mut:
+	id                                  u32
+	farmerid                            u32    // link back to farmer who owns the nodegroup, is a user?
+	secret                              string // only visible by farmer, in future encrypted, used to boot a node
+	description                         string
+	slapolicy                           SLAPolicy
+	pricingpolicy                       PricingPolicy
+	compute_slice_normalized_pricing_cc f64 // pricing in CC - cloud credit, per 2GB node slice
+	storage_slice_normalized_pricing_cc f64 // pricing in CC - cloud credit, per 1GB storage slice
+	signature_farmer string // signature as done by farmers to validate that they created this group
+}
+
+pub struct SLAPolicy {
+pub mut:
+	sla_uptime         int // should +90
+	sla_bandwidth_mbit int // minimal mbits we can expect avg over 1h per node, 0 means we don't guarantee
+	sla_penalty        int // 0-100, percent of money given back in relation to month if sla breached, e.g. 200 means we return 2 months worth of rev if sla missed
+}
+
+pub struct PricingPolicy {
+pub mut:
+	marketplace_year_discounts []int = [30, 40, 50] // e.g. 30,40,50 means if user has more CC in wallet than 1 year utilization on all his purchaes then this provider gives 30%, 2Y 40%, ...
+	// volume_discounts           []int = [10, 20, 30] // e.g. 10,20,30
+}
+
+
+
+
--- a/heromodels/src/models/grid4/specs/model_reputation.v
+++ b/heromodels/src/models/grid4/specs/model_reputation.v
@@ -0,0 +1,19 @@
+
+@[heap]
+pub struct NodeGroupReputation {
+pub mut:
+	nodegroup_id 	u32
+	reputation                          int = 50 // between 0 and 100, earned over time
+	uptime                              int // between 0 and 100, set by system, farmer has no ability to set this
+	nodes                               []NodeReputation
+}
+
+pub struct NodeReputation {
+pub mut:
+	node_id 							u32
+	reputation                          int = 50 // between 0 and 100, earned over time
+	uptime                              int // between 0 and 100, set by system, farmer has no ability to set this
+}
+
+
+
--- a/heromodels/src/models/heroledger/dnsrecord.rs
+++ b/heromodels/src/models/heroledger/dnsrecord.rs
@@ -1,4 +1,4 @@
-use heromodels_core::{Model, BaseModelData, IndexKey};
+use heromodels_core::{BaseModelData, IndexKey, Model};
 use heromodels_derive::model;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
@@ -209,10 +209,13 @@ pub struct DNSZone {
    pub base_data: BaseModelData,
    #[index]
    pub domain: String,
+    #[index(path = "subdomain")]
+    #[index(path = "record_type")]
    pub dnsrecords: Vec<DNSRecord>,
    pub administrators: Vec<u32>,
    pub status: DNSZoneStatus,
    pub metadata: HashMap<String, String>,
+    #[index(path = "primary_ns")]
    pub soarecord: Vec<SOARecord>,
 }

@@ -297,5 +300,3 @@ impl DNSZone {
        self
    }
 }
-
-
--- a/heromodels/src/models/heroledger/group.rs
+++ b/heromodels/src/models/heroledger/group.rs
@@ -1,4 +1,4 @@
-use heromodels_core::{Model, BaseModelData, IndexKey};
+use heromodels_core::{BaseModelData, IndexKey, Model};
 use heromodels_derive::model;
 use serde::{Deserialize, Serialize};

@@ -184,8 +184,6 @@ impl Group {
    }
 }

-
-
 /// Represents the membership relationship between users and groups
 #[model]
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
@@ -232,5 +230,3 @@ impl UserGroupMembership {
        self
    }
 }
-
-
--- a/heromodels/src/models/heroledger/membership.rs
+++ b/heromodels/src/models/heroledger/membership.rs
@@ -1,4 +1,4 @@
-use heromodels_core::{Model, BaseModelData, IndexKey};
+use heromodels_core::{BaseModelData, IndexKey, Model};
 use heromodels_derive::model;
 use serde::{Deserialize, Serialize};

@@ -111,5 +111,3 @@ impl Member {
        self
    }
 }
-
-
--- a/heromodels/src/models/heroledger/mod.rs
+++ b/heromodels/src/models/heroledger/mod.rs
@@ -1,20 +1,10 @@
 // Export all heroledger model modules
-pub mod user;
-pub mod group;
-pub mod money;
-pub mod membership;
 pub mod dnsrecord;
+pub mod group;
+pub mod membership;
+pub mod money;
+pub mod rhai;
 pub mod secretbox;
 pub mod signature;
+pub mod user;
 pub mod user_kvs;
-pub mod rhai;
-
-// Re-export key types for convenience
-pub use user::{User, UserStatus, UserProfile, KYCInfo, KYCStatus, SecretBox};
-pub use group::{Group, UserGroupMembership, GroupStatus, Visibility, GroupConfig};
-pub use money::{Account, Asset, AccountPolicy, AccountPolicyItem, Transaction, AccountStatus, TransactionType, Signature as TransactionSignature};
-pub use membership::{Member, MemberRole, MemberStatus};
-pub use dnsrecord::{DNSZone, DNSRecord, SOARecord, NameType, NameCat, DNSZoneStatus};
-pub use secretbox::{Notary, NotaryStatus, SecretBoxCategory};
-pub use signature::{Signature, SignatureStatus, ObjectType};
-pub use user_kvs::{UserKVS, UserKVSItem};
--- a/heromodels/src/models/heroledger/money.rs
+++ b/heromodels/src/models/heroledger/money.rs
@@ -1,4 +1,4 @@
-use heromodels_core::{Model, BaseModelData, IndexKey};
+use heromodels_core::{BaseModelData, IndexKey, Model};
 use heromodels_derive::model;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
@@ -223,8 +223,6 @@ impl Account {
    }
 }

-
-
 /// Represents an asset in the financial system
 #[model]
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
@@ -342,8 +340,6 @@ impl Asset {
    }
 }

-
-
 /// Represents account policies for various operations
 #[model]
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
@@ -400,8 +396,6 @@ impl AccountPolicy {
    }
 }

-
-
 /// Represents a financial transaction
 #[model]
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
@@ -511,5 +505,3 @@ impl Transaction {
        self
    }
 }
-
-
--- a/heromodels/src/models/heroledger/rhai.rs
+++ b/heromodels/src/models/heroledger/rhai.rs
@@ -1,8 +1,13 @@
 use ::rhai::plugin::*;
-use ::rhai::{Array, Dynamic, Engine, EvalAltResult, Map, Module};
+use ::rhai::{Dynamic, Engine, EvalAltResult, Module};
 use std::mem;

-use crate::models::heroledger::*;
+use crate::models::heroledger::{
+    dnsrecord::DNSZone,
+    group::{Group, Visibility},
+    money::Account,
+    user::{User, UserStatus},
+};

 // ============================================================================
 // User Module
@@ -12,6 +17,8 @@ type RhaiUser = User;

 #[export_module]
 mod rhai_user_module {
+    use crate::models::heroledger::user::User;
+
    use super::RhaiUser;

    #[rhai_fn(name = "new_user", return_raw)]
@@ -30,30 +37,21 @@ mod rhai_user_module {
    }

    #[rhai_fn(name = "add_email", return_raw)]
-    pub fn add_email(
-        user: &mut RhaiUser,
-        email: String,
-    ) -> Result<RhaiUser, Box<EvalAltResult>> {
+    pub fn add_email(user: &mut RhaiUser, email: String) -> Result<RhaiUser, Box<EvalAltResult>> {
        let owned = std::mem::take(user);
        *user = owned.add_email(email);
        Ok(user.clone())
    }

    #[rhai_fn(name = "pubkey", return_raw)]
-    pub fn set_pubkey(
-        user: &mut RhaiUser,
-        pubkey: String,
-    ) -> Result<RhaiUser, Box<EvalAltResult>> {
+    pub fn set_pubkey(user: &mut RhaiUser, pubkey: String) -> Result<RhaiUser, Box<EvalAltResult>> {
        let owned = std::mem::take(user);
        *user = owned.pubkey(pubkey);
        Ok(user.clone())
    }

    #[rhai_fn(name = "status", return_raw)]
-    pub fn set_status(
-        user: &mut RhaiUser,
-        status: String,
-    ) -> Result<RhaiUser, Box<EvalAltResult>> {
+    pub fn set_status(user: &mut RhaiUser, status: String) -> Result<RhaiUser, Box<EvalAltResult>> {
        let status_enum = match status.as_str() {
            "Active" => UserStatus::Active,
            "Inactive" => UserStatus::Inactive,
@@ -115,10 +113,7 @@ mod rhai_group_module {
    }

    #[rhai_fn(name = "name", return_raw)]
-    pub fn set_name(
-        group: &mut RhaiGroup,
-        name: String,
-    ) -> Result<RhaiGroup, Box<EvalAltResult>> {
+    pub fn set_name(group: &mut RhaiGroup, name: String) -> Result<RhaiGroup, Box<EvalAltResult>> {
        let owned = std::mem::take(group);
        *group = owned.name(name);
        Ok(group.clone())
@@ -263,15 +258,11 @@ mod rhai_dns_zone_module {
        Ok(zone.clone())
    }

-
-
    #[rhai_fn(name = "save_dns_zone", return_raw)]
    pub fn save_dns_zone(zone: &mut RhaiDNSZone) -> Result<RhaiDNSZone, Box<EvalAltResult>> {
        Ok(zone.clone())
    }

-
-
    // Getters
    #[rhai_fn(name = "get_id")]
    pub fn get_id(zone: &mut RhaiDNSZone) -> i64 {
--- a/heromodels/src/models/heroledger/secretbox.rs
+++ b/heromodels/src/models/heroledger/secretbox.rs
@@ -1,4 +1,4 @@
-use heromodels_core::{Model, BaseModelData, IndexKey};
+use heromodels_core::{BaseModelData, IndexKey, Model};
 use heromodels_derive::model;
 use serde::{Deserialize, Serialize};

@@ -138,5 +138,3 @@ impl Notary {
        self
    }
 }
-
-
--- a/heromodels/src/models/heroledger/signature.rs
+++ b/heromodels/src/models/heroledger/signature.rs
@@ -1,4 +1,4 @@
-use heromodels_core::{Model, BaseModelData, IndexKey};
+use heromodels_core::{BaseModelData, IndexKey, Model};
 use heromodels_derive::model;
 use serde::{Deserialize, Serialize};

@@ -116,5 +116,3 @@ impl Signature {
        self
    }
 }
-
-
--- a/heromodels/src/models/heroledger/user.rs
+++ b/heromodels/src/models/heroledger/user.rs
@@ -1,4 +1,4 @@
-use heromodels_core::{Model, BaseModelData, IndexKey};
+use heromodels_core::{BaseModelData, IndexKey, Model};
 use heromodels_derive::model;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
@@ -366,5 +366,3 @@ impl User {
        self
    }
 }
-
-
--- a/heromodels/src/models/heroledger/user_kvs.rs
+++ b/heromodels/src/models/heroledger/user_kvs.rs
@@ -1,7 +1,7 @@
-use heromodels_core::{Model, BaseModelData, IndexKey};
+use super::secretbox::SecretBox;
+use heromodels_core::{BaseModelData, IndexKey, Model};
 use heromodels_derive::model;
 use serde::{Deserialize, Serialize};
-use super::secretbox::SecretBox;

 /// Represents a per-user key-value store
 #[model]
@@ -44,8 +44,6 @@ impl UserKVS {
    }
 }

-
-
 /// Represents an item in a user's key-value store
 #[model]
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
@@ -116,5 +114,3 @@ impl UserKVSItem {
        self
    }
 }
-
-
--- a/heromodels/src/models/mod.rs
+++ b/heromodels/src/models/mod.rs
@@ -10,16 +10,16 @@ pub mod contact;
 pub mod finance;
 pub mod flow;
 pub mod governance;
+pub mod grid4;
 pub mod heroledger;
+pub mod identity;
 pub mod legal;
 pub mod library;
 pub mod location;
 pub mod object;
-pub mod projects;
 pub mod payment;
-pub mod identity;
-pub mod tfmarketplace;
-pub mod grid4;
+pub mod projects;
+// pub mod tfmarketplace;

 // Re-export key types for convenience
 pub use core::Comment;
@@ -39,3 +39,4 @@ pub use legal::{Contract, ContractRevision, ContractSigner, ContractStatus, Sign
 pub use library::collection::Collection;
 pub use library::items::{Image, Markdown, Pdf};
 pub use projects::{Project, Status};
+pub use heroledger::*;
--- a/heromodels/src/models/object/object_rhai_dsl.rs
+++ b/heromodels/src/models/object/object_rhai_dsl.rs
@@ -1,6 +1,6 @@
+use super::Object;
 use rhai::plugin::*;
 use rhai::{CustomType, Dynamic, Engine, EvalAltResult, Module};
-use super::Object;

 type RhaiObject = Object;

@@ -16,10 +16,7 @@ pub mod generated_rhai_module {

    /// Set the title of an Object
    #[rhai_fn(name = "object_title")]
-    pub fn object_title(
-        object: &mut RhaiObject,
-        title: String,
-    ) -> RhaiObject {
+    pub fn object_title(object: &mut RhaiObject, title: String) -> RhaiObject {
        let mut result = object.clone();
        result.title = title;
        result
@@ -27,10 +24,7 @@ pub mod generated_rhai_module {

    /// Set the description of an Object
    #[rhai_fn(name = "object_description")]
-    pub fn object_description(
-        object: &mut RhaiObject,
-        description: String,
-    ) -> RhaiObject {
+    pub fn object_description(object: &mut RhaiObject, description: String) -> RhaiObject {
        let mut result = object.clone();
        result.description = description;
        result
--- a/heromodels/test.sh
+++ b/heromodels/test.sh
@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Config matches examples/tests
+PGHOST=${PGHOST:-localhost}
+PGPORT=${PGPORT:-5432}
+PGUSER=${PGUSER:-postgres}
+PGPASSWORD=${PGPASSWORD:-test123}
+export PGPASSWORD
+
+echo "[test.sh] Checking Postgres at ${PGHOST}:${PGPORT} (user=${PGUSER})..."
+
+# Require pg_isready
+if ! command -v pg_isready >/dev/null 2>&1; then
+  echo "[test.sh] ERROR: pg_isready not found. Install PostgreSQL client tools (e.g., brew install libpq && brew link --force libpq)." >&2
+  exit 1
+fi
+
+# Wait for Postgres to be ready (30s timeout)
+ATTEMPTS=30
+until pg_isready -h "$PGHOST" -p "$PGPORT" -U "$PGUSER" >/dev/null 2>&1; do
+  ((ATTEMPTS--)) || {
+    echo "[test.sh] ERROR: Postgres not ready after 30s. Ensure it's running with user=$PGUSER password=$PGPASSWORD host=$PGHOST port=$PGPORT." >&2
+    exit 1
+  }
+  sleep 1
+  echo "[test.sh] Waiting for Postgres..."
+done
+
+echo "[test.sh] Postgres is ready. Running tests..."
+
+# Run fast OurDB test first (no Postgres dependency)
+echo "[test.sh] Running OurDB test: grid4_ourdb"
+cargo test -p heromodels --test grid4_ourdb
+
+# Run Postgres-backed tests (marked ignored)
+echo "[test.sh] Running Postgres test: heroledger_postgres (ignored)"
+cargo test -p heromodels --test heroledger_postgres -- --ignored
+
+echo "[test.sh] Running Postgres test: grid4_postgres (ignored)"
+cargo test -p heromodels --test grid4_postgres -- --ignored
+
+echo "[test.sh] Done."
--- a/heromodels/tests/grid4_models.rs
+++ b/heromodels/tests/grid4_models.rs
@@ -0,0 +1,117 @@
+use serde_json;
+
+use heromodels::models::grid4::{
+    ComputeSlice, DeviceInfo, Node, NodeCapacity, PricingPolicy, Reservation, ReservationStatus,
+    SLAPolicy, StorageDevice, StorageSlice,
+};
+
+#[test]
+fn build_and_serde_roundtrip_compute_storage_slices() {
+    let pricing = PricingPolicy::new()
+        .marketplace_year_discounts(vec![20, 30, 40])
+        .volume_discounts(vec![5, 10, 15])
+        .build();
+
+    let sla = SLAPolicy::new()
+        .sla_uptime(99)
+        .sla_bandwidth_mbit(1000)
+        .sla_penalty(150)
+        .build();
+
+    let cs = ComputeSlice::new()
+        .nodeid(42)
+        .slice_id(1)
+        .mem_gb(16.0)
+        .storage_gb(200.0)
+        .passmark(5000)
+        .vcores(8)
+        .cpu_oversubscription(2)
+        .storage_oversubscription(1)
+        .price_range(vec![0.5, 2.0])
+        .gpus(1)
+        .price_cc(1.25)
+        .pricing_policy(pricing.clone())
+        .sla_policy(sla.clone());
+
+    let ss = StorageSlice::new()
+        .nodeid(42)
+        .slice_id(2)
+        .price_cc(0.15)
+        .pricing_policy(pricing)
+        .sla_policy(sla);
+
+    // serde roundtrip compute slice
+    let s = serde_json::to_string(&cs).expect("serialize compute slice");
+    let cs2: ComputeSlice = serde_json::from_str(&s).expect("deserialize compute slice");
+    assert_eq!(cs, cs2);
+
+    // serde roundtrip storage slice
+    let s2 = serde_json::to_string(&ss).expect("serialize storage slice");
+    let ss2: StorageSlice = serde_json::from_str(&s2).expect("deserialize storage slice");
+    assert_eq!(ss, ss2);
+}
+
+#[test]
+fn build_and_serde_roundtrip_node() {
+    let dev = DeviceInfo {
+        vendor: "AcmeVendor".into(),
+        storage: vec![StorageDevice { id: "sda".into(), size_gb: 512.0, description: "NVMe".into() }],
+        memory: vec![],
+        cpu: vec![],
+        gpu: vec![],
+        network: vec![],
+    };
+
+    let cap = NodeCapacity { storage_gb: 2048.0, mem_gb: 128.0, mem_gb_gpu: 24.0, passmark: 12000, vcores: 32 };
+
+    let cs = ComputeSlice::new().nodeid(1).slice_id(1).mem_gb(8.0).storage_gb(100.0).passmark(2500).vcores(4);
+    let ss = StorageSlice::new().nodeid(1).slice_id(2).price_cc(0.2);
+
+    let node = Node::new()
+        .nodegroupid(7)
+        .uptime(99)
+        .add_compute_slice(cs)
+        .add_storage_slice(ss)
+        .devices(dev)
+        .country("NL")
+        .capacity(cap)
+        .provisiontime(1710000000)
+        .pubkey("node_pubkey")
+        .signature_node("sig_node")
+        .signature_farmer("sig_farmer");
+
+    let s = serde_json::to_string(&node).expect("serialize node");
+    let node2: Node = serde_json::from_str(&s).expect("deserialize node");
+
+    assert_eq!(node.nodegroupid, node2.nodegroupid);
+    assert_eq!(node.uptime, node2.uptime);
+    assert_eq!(node.country, node2.country);
+    assert_eq!(node.pubkey, node2.pubkey);
+    assert_eq!(node.signature_node, node2.signature_node);
+    assert_eq!(node.signature_farmer, node2.signature_farmer);
+    assert_eq!(node.computeslices.len(), node2.computeslices.len());
+    assert_eq!(node.storageslices.len(), node2.storageslices.len());
+}
+
+#[test]
+fn build_and_serde_roundtrip_reservation() {
+    let reservation = Reservation::new()
+        .customer_id(1234)
+        .add_compute_slice(11)
+        .add_storage_slice(22)
+        .status(ReservationStatus::Confirmed)
+        .obligation(true)
+        .start_date(1_710_000_000)
+        .end_date(1_720_000_000);
+
+    let s = serde_json::to_string(&reservation).expect("serialize reservation");
+    let reservation2: Reservation = serde_json::from_str(&s).expect("deserialize reservation");
+
+    assert_eq!(reservation.customer_id, reservation2.customer_id);
+    assert_eq!(reservation.status, reservation2.status);
+    assert_eq!(reservation.obligation, reservation2.obligation);
+    assert_eq!(reservation.start_date, reservation2.start_date);
+    assert_eq!(reservation.end_date, reservation2.end_date);
+    assert_eq!(reservation.compute_slices, reservation2.compute_slices);
+    assert_eq!(reservation.storage_slices, reservation2.storage_slices);
+}
--- a/heromodels/tests/grid4_ourdb.rs
+++ b/heromodels/tests/grid4_ourdb.rs
@@ -0,0 +1,82 @@
+use heromodels::db::hero::OurDB;
+use heromodels::db::{Collection, Db};
+use heromodels::models::grid4::node::node_index::{country, nodegroupid, pubkey};
+use heromodels::models::grid4::node::{ComputeSlice, DeviceInfo, Node};
+use heromodels_core::Model;
+use std::sync::Arc;
+
+fn create_test_db() -> Arc<OurDB> {
+    let ts = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .as_nanos();
+    let path = format!("/tmp/grid4_node_test_{}", ts);
+    let _ = std::fs::remove_dir_all(&path);
+    Arc::new(OurDB::new(path, true).expect("create OurDB"))
+}
+
+#[test]
+fn grid4_node_basic_roundtrip_and_indexes() {
+    let db = create_test_db();
+    let nodes = db.collection::<Node>().expect("open node collection");
+
+    // Clean any leftover
+    if let Ok(existing) = nodes.get_all() {
+        for n in existing {
+            let _ = nodes.delete_by_id(n.get_id());
+        }
+    }
+
+    // Build a node with some compute slices and device info
+    let cs = ComputeSlice::new()
+        .nodeid(1)
+        .slice_id(1)
+        .mem_gb(32.0)
+        .storage_gb(512.0)
+        .passmark(5000)
+        .vcores(16)
+        .gpus(1)
+        .price_cc(0.25);
+
+    let dev = DeviceInfo {
+        vendor: "ACME".into(),
+        ..Default::default()
+    };
+
+    let n = Node::new()
+        .nodegroupid(42)
+        .uptime(99)
+        .add_compute_slice(cs)
+        .devices(dev)
+        .country("BE")
+        .pubkey("PUB_NODE_1")
+        .build();
+
+    let (id, stored) = nodes.set(&n).expect("store node");
+    assert!(id > 0);
+    assert_eq!(stored.country, "BE");
+
+    // get by id
+    let fetched = nodes.get_by_id(id).expect("get by id").expect("exists");
+    assert_eq!(fetched.pubkey, "PUB_NODE_1");
+
+    // query by top-level indexes
+    let by_country = nodes.get::<country, _>("BE").expect("query country");
+    assert_eq!(by_country.len(), 1);
+    assert_eq!(by_country[0].get_id(), id);
+
+    let by_group = nodes.get::<nodegroupid, _>(&42).expect("query group");
+    assert_eq!(by_group.len(), 1);
+
+    let by_pubkey = nodes.get::<pubkey, _>("PUB_NODE_1").expect("query pubkey");
+    assert_eq!(by_pubkey.len(), 1);
+
+    // update
+    let updated = fetched.clone().country("NL");
+    let (_, back) = nodes.set(&updated).expect("update node");
+    assert_eq!(back.country, "NL");
+
+    // delete
+    nodes.delete_by_id(id).expect("delete");
+    assert!(nodes.get_by_id(id).expect("get after delete").is_none());
+}
--- a/heromodels/tests/grid4_postgres.rs
+++ b/heromodels/tests/grid4_postgres.rs
@@ -0,0 +1,125 @@
+use heromodels::db::postgres::{Config, Postgres};
+use heromodels::db::{Collection, Db};
+use heromodels::models::grid4::node::node_index::{country, nodegroupid, pubkey};
+use heromodels::models::grid4::node::{ComputeSlice, DeviceInfo, Node};
+use heromodels_core::Model;
+
+// Requires local Postgres (user=postgres password=test123 host=localhost port=5432)
+// Run with: cargo test -p heromodels --test grid4_postgres -- --ignored
+#[test]
+#[ignore]
+fn grid4_node_postgres_roundtrip_like_example() {
+    let db = Postgres::new(
+        Config::new()
+            .user(Some("postgres".into()))
+            .password(Some("test123".into()))
+            .host(Some("localhost".into()))
+            .port(Some(5432)),
+    )
+    .expect("can connect to Postgres");
+
+    let nodes = db.collection::<Node>().expect("open node collection");
+
+    // Clean existing
+    if let Ok(existing) = nodes.get_all() {
+        for n in existing {
+            let _ = nodes.delete_by_id(n.get_id());
+        }
+    }
+
+    // Build and store multiple nodes via builder and then persist via collection.set(), like examples
+    let cs1 = ComputeSlice::new()
+        .nodeid(10)
+        .slice_id(1)
+        .mem_gb(32.0)
+        .storage_gb(512.0)
+        .passmark(5000)
+        .vcores(16)
+        .gpus(1)
+        .price_cc(0.25);
+    let cs2 = ComputeSlice::new()
+        .nodeid(10)
+        .slice_id(2)
+        .mem_gb(64.0)
+        .storage_gb(2048.0)
+        .passmark(7000)
+        .vcores(24)
+        .gpus(2)
+        .price_cc(0.50);
+    let cs3 = ComputeSlice::new()
+        .nodeid(11)
+        .slice_id(1)
+        .mem_gb(16.0)
+        .storage_gb(256.0)
+        .passmark(3000)
+        .vcores(8)
+        .gpus(0)
+        .price_cc(0.10);
+
+    let dev = DeviceInfo { vendor: "ACME".into(), ..Default::default() };
+
+    let n1 = Node::new()
+        .nodegroupid(99)
+        .uptime(97)
+        .add_compute_slice(cs1)
+        .devices(dev.clone())
+        .country("BE")
+        .pubkey("PG_NODE_1")
+        .build();
+    let n2 = Node::new()
+        .nodegroupid(99)
+        .uptime(96)
+        .add_compute_slice(cs2)
+        .devices(dev.clone())
+        .country("NL")
+        .pubkey("PG_NODE_2")
+        .build();
+    let n3 = Node::new()
+        .nodegroupid(7)
+        .uptime(95)
+        .add_compute_slice(cs3)
+        .devices(dev)
+        .country("BE")
+        .pubkey("PG_NODE_3")
+        .build();
+
+    let (id1, s1) = nodes.set(&n1).expect("store n1");
+    let (id2, s2) = nodes.set(&n2).expect("store n2");
+    let (id3, s3) = nodes.set(&n3).expect("store n3");
+    assert!(id1 > 0 && id2 > 0 && id3 > 0);
+
+    // Query by top-level indexes similar to the example style
+    let be_nodes = nodes.get::<country, _>("BE").expect("by country");
+    assert_eq!(be_nodes.len(), 2);
+
+    let grp_99 = nodes.get::<nodegroupid, _>(&99).expect("by group");
+    assert_eq!(grp_99.len(), 2);
+
+    let by_key = nodes.get::<pubkey, _>("PG_NODE_2").expect("by pubkey");
+    assert_eq!(by_key.len(), 1);
+    assert_eq!(by_key[0].get_id(), id2);
+
+    // Update: change country of n1
+    let updated = s1.clone().country("DE");
+    let (_, back) = nodes.set(&updated).expect("update n1");
+    assert_eq!(back.country, "DE");
+
+    // Cardinality after update
+    let de_nodes = nodes.get::<country, _>("DE").expect("by country DE");
+    assert_eq!(de_nodes.len(), 1);
+
+    // Delete by id and by index
+    nodes.delete_by_id(id2).expect("delete n2 by id");
+    assert!(nodes.get_by_id(id2).unwrap().is_none());
+
+    nodes.delete::<pubkey, _>("PG_NODE_3").expect("delete n3 by pubkey");
+    assert!(nodes.get_by_id(id3).unwrap().is_none());
+
+    // Remaining should be updated n1 only; verify via targeted queries
+    let de_nodes = nodes.get::<country, _>("DE").expect("country DE after deletes");
+    assert_eq!(de_nodes.len(), 1);
+    assert_eq!(de_nodes[0].get_id(), id1);
+    let by_key = nodes.get::<pubkey, _>("PG_NODE_1").expect("by pubkey PG_NODE_1");
+    assert_eq!(by_key.len(), 1);
+    assert_eq!(by_key[0].get_id(), id1);
+}
--- a/heromodels/tests/heroledger_postgres.rs
+++ b/heromodels/tests/heroledger_postgres.rs
@@ -0,0 +1,97 @@
+use heromodels::db::postgres::{Config, Postgres};
+use heromodels::db::{Collection, Db};
+use heromodels::models::heroledger::user::user_index::username;
+use heromodels::models::heroledger::user::User;
+use heromodels_core::Model;
+
+// NOTE: Requires a local Postgres running with user=postgres password=test123 host=localhost port=5432
+// Marked ignored by default. Run with: cargo test -p heromodels --test heroledger_postgres -- --ignored
+#[test]
+#[ignore]
+fn heroledger_user_postgres_roundtrip() {
+    // Connect
+    let db = Postgres::new(
+        Config::new()
+            .user(Some("postgres".into()))
+            .password(Some("test123".into()))
+            .host(Some("localhost".into()))
+            .port(Some(5432)),
+    )
+    .expect("can connect to Postgres");
+
+    // Open collection (will create table and indexes for top-level fields)
+    let users = db.collection::<User>().expect("can open user collection");
+
+    // Clean slate
+    if let Ok(existing) = users.get_all() {
+        for u in existing {
+            let _ = users.delete_by_id(u.get_id());
+        }
+    }
+
+    // Unique suffix to avoid collisions with any pre-existing rows
+    let uniq = format!("{}", std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .as_nanos());
+    let alice = format!("alice_{}", uniq);
+    let bob = format!("bob_{}", uniq);
+    let carol = format!("carol_{}", uniq);
+
+    // Build and store multiple users
+    let u1 = User::new(0)
+        .username(&alice)
+        .pubkey("PUBKEY_A")
+        .add_email("alice@example.com")
+        .build();
+    let u2 = User::new(0)
+        .username(&bob)
+        .pubkey("PUBKEY_B")
+        .add_email("bob@example.com")
+        .build();
+    let u3 = User::new(0)
+        .username(&carol)
+        .pubkey("PUBKEY_C")
+        .add_email("carol@example.com")
+        .build();
+
+    let (id1, db_u1) = users.set(&u1).expect("store u1");
+    let (id2, db_u2) = users.set(&u2).expect("store u2");
+    let (id3, db_u3) = users.set(&u3).expect("store u3");
+    assert!(id1 > 0 && id2 > 0 && id3 > 0);
+
+    // Fetch by id
+    assert_eq!(users.get_by_id(id1).unwrap().unwrap().username, alice);
+    assert_eq!(users.get_by_id(id2).unwrap().unwrap().username, bob);
+    assert_eq!(users.get_by_id(id3).unwrap().unwrap().username, carol);
+
+    // Fetch by index (top-level username)
+    let by_username = users.get::<username, _>(&alice).expect("by username");
+    assert_eq!(by_username.len(), 1);
+    assert_eq!(by_username[0].get_id(), id1);
+
+    // Update one
+    let updated = db_u1.clone().add_email("work@alice.example");
+    let (id1b, updated_back) = users.set(&updated).expect("update alice");
+    assert_eq!(id1b, id1);
+    assert!(updated_back.email.len() >= 2);
+
+    // Targeted queries to avoid legacy rows in the same table
+    // Verify three users exist via index queries
+    assert_eq!(users.get::<username, _>(&alice).unwrap().len(), 1);
+    assert_eq!(users.get::<username, _>(&bob).unwrap().len(), 1);
+    assert_eq!(users.get::<username, _>(&carol).unwrap().len(), 1);
+
+    // Delete by id
+    users.delete_by_id(id2).expect("delete bob by id");
+    assert!(users.get_by_id(id2).unwrap().is_none());
+
+    // Delete by index (username)
+    users.delete::<username, _>(&carol).expect("delete carol by username");
+    assert!(users.get_by_id(id3).unwrap().is_none());
+
+    // Remaining should be just alice; verify via index
+    let remain = users.get::<username, _>(&alice).expect("get alice after delete");
+    assert_eq!(remain.len(), 1);
+    assert_eq!(remain[0].get_id(), id1);
+}
--- a/heromodels/tests/payment.rs
+++ b/heromodels/tests/payment.rs
@@ -1,4 +1,5 @@
 use heromodels::db::Collection;
+use heromodels::db::Db;
 use heromodels::db::hero::OurDB;
 use heromodels::models::biz::{BusinessType, Company, CompanyStatus, Payment, PaymentStatus};
 use heromodels_core::Model;
@@ -197,12 +198,18 @@ fn test_payment_database_persistence() {
    );

    // Save payment
-    let (payment_id, saved_payment) = db.set(&payment).expect("Failed to save payment");
+    let (payment_id, saved_payment) = db
+        .collection::<Payment>()
+        .expect("open payment collection")
+        .set(&payment)
+        .expect("Failed to save payment");
    assert!(payment_id > 0);
    assert_eq!(saved_payment.payment_intent_id, "pi_db_test");

    // Retrieve payment
    let retrieved_payment: Payment = db
+        .collection::<Payment>()
+        .expect("open payment collection")
        .get_by_id(payment_id)
        .expect("Failed to get payment")
        .unwrap();
@@ -224,20 +231,34 @@ fn test_payment_status_transitions() {
        1360.0,
    );

-    let (payment_id, mut payment) = db.set(&payment).expect("Failed to save payment");
+    let (payment_id, mut payment) = db
+        .collection::<Payment>()
+        .expect("open payment collection")
+        .set(&payment)
+        .expect("Failed to save payment");

    // Test pending -> completed
    payment = payment.complete_payment(Some("cus_transition_test".to_string()));
-    let (_, mut payment) = db.set(&payment).expect("Failed to update payment");
+    let (_, mut payment) = db
+        .collection::<Payment>()
+        .expect("open payment collection")
+        .set(&payment)
+        .expect("Failed to update payment");
    assert!(payment.is_completed());

    // Test completed -> refunded
    payment = payment.refund_payment();
-    let (_, payment) = db.set(&payment).expect("Failed to update payment");
+    let (_, payment) = db
+        .collection::<Payment>()
+        .expect("open payment collection")
+        .set(&payment)
+        .expect("Failed to update payment");
    assert!(payment.is_refunded());

    // Verify final state in database
    let final_payment: Payment = db
+        .collection::<Payment>()
+        .expect("open payment collection")
        .get_by_id(payment_id)
        .expect("Failed to get payment")
        .unwrap();
@@ -270,15 +291,18 @@ fn test_company_payment_integration() {
    let db = create_test_db();

    // Create company with default PendingPayment status
-    let company = Company::new(
-        "Integration Test Corp".to_string(),
-        "ITC-001".to_string(),
-        chrono::Utc::now().timestamp(),
-    )
-    .email("test@integration.com".to_string())
-    .business_type(BusinessType::Starter);
+    let company = Company::new()
+        .name("Integration Test Corp")
+        .registration_number("ITC-001")
+        .incorporation_date(chrono::Utc::now().timestamp())
+        .email("test@integration.com")
+        .business_type(BusinessType::Starter);

-    let (company_id, company) = db.set(&company).expect("Failed to save company");
+    let (company_id, company) = db
+        .collection::<Company>()
+        .expect("open company collection")
+        .set(&company)
+        .expect("Failed to save company");
    assert_eq!(company.status, CompanyStatus::PendingPayment);

    // Create payment for the company
@@ -291,18 +315,28 @@ fn test_company_payment_integration() {
        305.0,
    );

-    let (_payment_id, payment) = db.set(&payment).expect("Failed to save payment");
+    let (_payment_id, payment) = db
+        .collection::<Payment>()
+        .expect("open payment collection")
+        .set(&payment)
+        .expect("Failed to save payment");
    assert_eq!(payment.company_id, company_id);

    // Complete payment
    let completed_payment = payment.complete_payment(Some("cus_integration_test".to_string()));
    let (_, completed_payment) = db
+        .collection::<Payment>()
+        .expect("open payment collection")
        .set(&completed_payment)
        .expect("Failed to update payment");

    // Update company status to Active
    let active_company = company.status(CompanyStatus::Active);
-    let (_, active_company) = db.set(&active_company).expect("Failed to update company");
+    let (_, active_company) = db
+        .collection::<Company>()
+        .expect("open company collection")
+        .set(&active_company)
+        .expect("Failed to update company");

    // Verify final states
    assert!(completed_payment.is_completed());
--- a/specs/billingmanager_research/billingmanager.md
+++ b/specs/billingmanager_research/billingmanager.md
@@ -0,0 +1,345 @@
+
+### 2.1 Accounts
+
+* **id**: `BIGINT` identity (non-negative), unique account id
+* **pubkey**: `BYTEA` unique public key for signing/encryption
+* **display\_name**: `TEXT` (optional)
+* **created\_at**: `TIMESTAMPTZ`
+
+### 2.2 Currencies
+
+* **asset\_code**: `TEXT` PK (e.g., `USDC-ETH`, `EUR`, `LND`)
+* **name**: `TEXT`
+* **symbol**: `TEXT`
+* **decimals**: `INT` (default 2)
+
+---
+
+## 3) Services & Groups
+
+### 3.1 Services
+
+* **id**: `BIGINT` identity
+* **name**: `TEXT` unique
+* **description**: `TEXT`
+* **default\_billing\_mode**: `ENUM('per_second','per_request')`
+* **default\_price**: `NUMERIC(38,18)` (≥0)
+* **default\_currency**: FK → `currencies(asset_code)`
+* **max\_request\_seconds**: `INT` (>0 or `NULL`)
+* **schema\_heroscript**: `TEXT`
+* **schema\_json**: `JSONB`
+* **created\_at**: `TIMESTAMPTZ`
+
+#### Accepted Currencies (per service)
+
+* **service\_id**: FK → `services(id)`
+* **asset\_code**: FK → `currencies(asset_code)`
+* **price\_override**: `NUMERIC(38,18)` (optional)
+* **billing\_mode\_override**: `ENUM` (optional)
+  Primary key: `(service_id, asset_code)`
+
+### 3.2 Service Groups
+
+* **id**: `BIGINT` identity
+* **name**: `TEXT` unique
+* **description**: `TEXT`
+* **created\_at**: `TIMESTAMPTZ`
+
+#### Group Memberships
+
+* **group\_id**: FK → `service_groups(id)`
+* **service\_id**: FK → `services(id)`
+  Primary key: `(group_id, service_id)`
+
+---
+
+## 4) Providers & Runners
+
+### 4.1 Service Providers
+
+* **id**: `BIGINT` identity
+* **account\_id**: FK → `accounts(id)` (the owning account)
+* **name**: `TEXT` unique
+* **description**: `TEXT`
+* **created\_at**: `TIMESTAMPTZ`
+
+#### Providers Offer Groups
+
+* **provider\_id**: FK → `service_providers(id)`
+* **group\_id**: FK → `service_groups(id)`
+  Primary key: `(provider_id, group_id)`
+
+#### Provider Pricing Overrides (optional)
+
+* **provider\_id**: FK → `service_providers(id)`
+* **service\_id**: FK → `services(id)`
+* **asset\_code**: FK → `currencies(asset_code)` (nullable for currency-agnostic override)
+* **price\_override**: `NUMERIC(38,18)` (optional)
+* **billing\_mode\_override**: `ENUM` (optional)
+* **max\_request\_seconds\_override**: `INT` (optional)
+  Primary key: `(provider_id, service_id, asset_code)`
+
+### 4.2 Runners
+
+* **id**: `BIGINT` identity
+* **address**: `INET` (must be IPv6)
+* **name**: `TEXT`
+* **description**: `TEXT`
+* **pubkey**: `BYTEA` (optional)
+* **created\_at**: `TIMESTAMPTZ`
+
+#### Runner Ownership (many-to-many)
+
+* **runner\_id**: FK → `runners(id)`
+* **provider\_id**: FK → `service_providers(id)`
+  Primary key: `(runner_id, provider_id)`
+
+#### Routing (provider → service/service\_group → runners)
+
+* **provider\_service\_runners**: `(provider_id, service_id, runner_id)` PK
+* **provider\_service\_group\_runners**: `(provider_id, group_id, runner_id)` PK
+
+---
+
+## 5) Subscriptions & Spend Control
+
+A subscription authorizes an **account** to use either a **service** **or** a **service group**, with optional spend limits and allowed providers.
+
+* **id**: `BIGINT` identity
+* **account\_id**: FK → `accounts(id)`
+* **service\_id** *xor* **group\_id**: FK (exactly one must be set)
+* **secret**: `BYTEA` (random, provided by subscriber; recommend storing a hash)
+* **subscription\_data**: `JSONB` (free-form)
+* **limit\_amount**: `NUMERIC(38,18)` (optional)
+* **limit\_currency**: FK → `currencies(asset_code)` (optional)
+* **limit\_period**: `ENUM('hour','day','month')` (optional)
+* **active**: `BOOLEAN` default `TRUE`
+* **created\_at**: `TIMESTAMPTZ`
+
+#### Allowed Providers per Subscription
+
+* **subscription\_id**: FK → `subscriptions(id)`
+* **provider\_id**: FK → `service_providers(id)`
+  Primary key: `(subscription_id, provider_id)`
+
+**Intended Use:**
+
+* Subscribers bound spending by amount/currency/period.
+* Merchant (provider) can claim charges for requests fulfilled under an active subscription, within limits, and only if listed in `subscription_providers`.
+
+---
+
+## 6) Requests & Billing
+
+### 6.1 Request Lifecycle
+
+* **id**: `BIGINT` identity
+* **account\_id**: FK → `accounts(id)`
+* **subscription\_id**: FK → `subscriptions(id)`
+* **provider\_id**: FK → `service_providers(id)`
+* **service\_id**: FK → `services(id)`
+* **runner\_id**: FK → `runners(id)` (nullable)
+* **request\_schema**: `JSONB` (payload matching `schema_json`/`schema_heroscript`)
+* **started\_at**, **ended\_at**: `TIMESTAMPTZ`
+* **status**: `ENUM('pending','running','succeeded','failed','canceled')`
+* **created\_at**: `TIMESTAMPTZ`
+
+### 6.2 Billing Ledger (append-only)
+
+* **id**: `BIGINT` identity
+* **account\_id**: FK → `accounts(id)`
+* **provider\_id**: FK → `service_providers(id)` (nullable)
+* **service\_id**: FK → `services(id)` (nullable)
+* **request\_id**: FK → `requests(id)` (nullable)
+* **amount**: `NUMERIC(38,18)` (debit = positive, credit/refund = negative)
+* **asset\_code**: FK → `currencies(asset_code)`
+* **entry\_type**: `ENUM('debit','credit','adjustment')`
+* **description**: `TEXT`
+* **created\_at**: `TIMESTAMPTZ`
+
+**Balances View (example):**
+
+* `account_balances(account_id, asset_code, balance)` as a view over `billing_ledger`.
+
+---
+
+## 7) Pricing Precedence
+
+When computing the **effective** pricing, billing mode, and max duration for a `(provider, service, currency)`:
+
+1. **Provider override for (service, asset\_code)** — if present, use it.
+2. **Service accepted currency override** — if present, use it.
+3. **Service defaults** — fallback.
+
+If `billing_mode` or `max_request_seconds` are not overridden at steps (1) or (2), inherit from the next step down.
+
+---
+
+## 8) Key Constraints & Validations
+
+* All identity ids are non-negative (`CHECK (id >= 0)`).
+* Runner IPv6 enforcement: `CHECK (family(address) = 6)`.
+* Subscriptions must point to **exactly one** of `service_id` or `group_id`.
+* Prices and limits must be non-negative if set.
+* Unique natural keys where appropriate: service names, provider names, currency asset codes, account pubkeys.
+
+---
+
+## 9) Mermaid Diagrams
+
+### 9.1 Entity–Relationship Overview
+
+```mermaid
+erDiagram
+    ACCOUNTS ||--o{ SERVICE_PROVIDERS : "owns via account_id"
+    ACCOUNTS ||--o{ SUBSCRIPTIONS : has
+    CURRENCIES ||--o{ SERVICES : "default_currency"
+    CURRENCIES ||--o{ SERVICE_ACCEPTED_CURRENCIES : "asset_code"
+    CURRENCIES ||--o{ PROVIDER_SERVICE_OVERRIDES : "asset_code"
+    CURRENCIES ||--o{ BILLING_LEDGER : "asset_code"
+
+    SERVICES ||--o{ SERVICE_ACCEPTED_CURRENCIES : has
+    SERVICES ||--o{ SERVICE_GROUP_MEMBERS : member_of
+    SERVICE_GROUPS ||--o{ SERVICE_GROUP_MEMBERS : contains
+
+    SERVICE_PROVIDERS ||--o{ PROVIDER_SERVICE_GROUPS : offers
+    SERVICE_PROVIDERS ||--o{ PROVIDER_SERVICE_OVERRIDES : sets
+    SERVICE_PROVIDERS ||--o{ RUNNER_OWNERS : owns
+    SERVICE_PROVIDERS ||--o{ PROVIDER_SERVICE_RUNNERS : routes
+    SERVICE_PROVIDERS ||--o{ PROVIDER_SERVICE_GROUP_RUNNERS : routes
+
+    RUNNERS ||--o{ RUNNER_OWNERS : owned_by
+    RUNNERS ||--o{ PROVIDER_SERVICE_RUNNERS : executes
+    RUNNERS ||--o{ PROVIDER_SERVICE_GROUP_RUNNERS : executes
+
+    SUBSCRIPTIONS ||--o{ SUBSCRIPTION_PROVIDERS : allow
+    SERVICE_PROVIDERS ||--o{ SUBSCRIPTION_PROVIDERS : allowed
+
+    REQUESTS }o--|| ACCOUNTS : by
+    REQUESTS }o--|| SUBSCRIPTIONS : under
+    REQUESTS }o--|| SERVICE_PROVIDERS : via
+    REQUESTS }o--|| SERVICES : for
+    REQUESTS }o--o{ RUNNERS : executed_by
+
+    BILLING_LEDGER }o--|| ACCOUNTS : charges
+    BILLING_LEDGER }o--o{ SERVICES : reference
+    BILLING_LEDGER }o--o{ SERVICE_PROVIDERS : reference
+    BILLING_LEDGER }o--o{ REQUESTS : reference
+```
+
+### 9.2 Request Flow (Happy Path)
+
+```mermaid
+sequenceDiagram
+    autonumber
+    participant AC as Account
+    participant API as Broker/API
+    participant PR as Provider
+    participant RU as Runner
+    participant DB as PostgreSQL
+
+    AC->>API: Submit request (subscription_id, service_id, payload, secret)
+    API->>DB: Validate subscription (active, provider allowed, spend limits)
+    DB-->>API: OK + effective pricing (resolve precedence)
+    API->>PR: Dispatch request (service, payload)
+    PR->>DB: Select runner (provider_service_runners / group runners)
+    PR->>RU: Start job (payload)
+    RU-->>PR: Job started (started_at)
+    PR->>DB: Update REQUESTS (status=running, started_at)
+    RU-->>PR: Job finished (duration, result)
+    PR->>DB: Update REQUESTS (status=succeeded, ended_at)
+    API->>DB: Insert BILLING_LEDGER (debit per effective price)
+    DB-->>API: Ledger entry id
+    API-->>AC: Return result + charge info
+```
+
+### 9.3 Pricing Resolution
+
+```mermaid
+flowchart TD
+    A[Input: provider_id, service_id, asset_code] --> B{Provider override exists for (service, asset_code)?}
+    B -- Yes --> P1[Use provider price/mode/max]
+    B -- No --> C{Service accepted currency override exists?}
+    C -- Yes --> P2[Use service currency price/mode]
+    C -- No --> P3[Use service defaults]
+    P1 --> OUT[Effective pricing]
+    P2 --> OUT
+    P3 --> OUT
+```
+
+---
+
+## 10) Operational Notes
+
+* **Secrets:** store a hash (e.g., `digest(secret,'sha256')`) rather than raw `secret`. Keep the original only client-side.
+* **Limits enforcement:** before insert of a debit ledger entry, compute period window (hour/day/month UTC or tenant TZ) and enforce `SUM(amount) + new_amount ≤ limit_amount`.
+* **Durations:** enforce `max_request_seconds` (effective) at orchestration and/or via DB trigger on `REQUESTS` when transitioning to `running/succeeded`.
+* **Routing:** prefer `provider_service_runners` when a request targets a service directly; otherwise use the union of runners from `provider_service_group_runners` for the group.
+* **Balances:** serve balance queries via the `account_balances` view or a materialized cache updated by triggers/jobs.
+
+---
+
+## 11) Example Effective Pricing Query (sketch)
+
+```sql
+-- Inputs: :provider_id, :service_id, :asset_code
+WITH p AS (
+  SELECT price_override, billing_mode_override, max_request_seconds_override
+  FROM provider_service_overrides
+  WHERE provider_id = :provider_id
+    AND service_id  = :service_id
+    AND (asset_code = :asset_code)
+),
+sac AS (
+  SELECT price_override, billing_mode_override
+  FROM service_accepted_currencies
+  WHERE service_id = :service_id AND asset_code = :asset_code
+),
+svc AS (
+  SELECT default_price AS price, default_billing_mode AS mode, max_request_seconds
+  FROM services WHERE id = :service_id
+)
+SELECT
+  COALESCE(p.price_override, sac.price_override, svc.price)                AS effective_price,
+  COALESCE(p.billing_mode_override, sac.billing_mode_override, svc.mode)   AS effective_mode,
+  COALESCE(p.max_request_seconds_override, svc.max_request_seconds)        AS effective_max_seconds;
+```
+
+---
+
+## 12) Indices (non-exhaustive)
+
+* `services(default_currency)`
+* `service_accepted_currencies(service_id)`
+* `provider_service_overrides(service_id, provider_id)`
+* `requests(account_id)`, `requests(provider_id)`, `requests(service_id)`
+* `billing_ledger(account_id, asset_code)`
+* `subscriptions(account_id) WHERE active`
+
+---
+
+## 13) Migration & Compatibility
+
+* Prefer additive migrations (new columns/tables) to avoid downtime.
+* Use `ENUM` via `CREATE TYPE`; when extending, plan for `ALTER TYPE ... ADD VALUE`.
+* For high-write ledgers, consider partitioning `billing_ledger` by `created_at` (monthly) and indexing partitions.
+
+---
+
+## 14) Non-Goals
+
+* Wallet custody and on-chain settlement are out of scope.
+* SLA tracking and detailed observability (metrics/log schema) are not part of this spec.
+
+---
+
+## 15) Acceptance Criteria
+
+* Can represent services, groups, and providers with currency-specific pricing.
+* Can route requests to runners by service or group.
+* Can authorize usage via subscriptions, enforce spend limits, and record charges.
+* Can reconstruct balances and audit via append-only ledger.
+
+---
+
+**End of Spec**
--- a/specs/billingmanager_research/conceptnote.md
+++ b/specs/billingmanager_research/conceptnote.md
@@ -0,0 +1,225 @@
+
+# Concept Note: Generic Billing & Tracking Framework
+
+## 1) Purpose
+
+The model is designed to support a **flexible, generic, and auditable** billing environment that can be applied across diverse services and providers — from compute time billing to per-request API usage, across multiple currencies, with dynamic provider-specific overrides.
+
+It is **not tied to a single business domain** — the same framework can be used for:
+
+* Cloud compute time (per second)
+* API transactions (per request)
+* Data transfer charges
+* Managed service subscriptions
+* Brokered third-party service reselling
+
+---
+
+## 2) Key Concepts
+
+### 2.1 Accounts
+
+An **account** represents an economic actor in the system — typically a customer or a service provider.
+
+* Identified by a **public key** (for authentication & cryptographic signing).
+* Every billing action traces back to an account.
+
+---
+
+### 2.2 Currencies & Asset Codes
+
+The system supports **multiple currencies** (crypto or fiat) via **asset codes**.
+
+* Asset codes identify the unit of billing (e.g. `USDC-ETH`, `EUR`, `LND`).
+* Currencies are **decoupled from services** so you can add or remove supported assets at any time.
+
+---
+
+### 2.3 Services & Groups
+
+* **Service** = a billable offering (e.g., "Speech-to-Text", "VM Hosting").
+
+  * Has a **billing mode** (`per_second` or `per_request`).
+  * Has a **default price** and **default currency**.
+  * Supports **multiple accepted currencies** with optional per-currency pricing overrides.
+  * Has execution constraints (e.g. `max_request_seconds`).
+  * Includes structured schemas for request payloads.
+
+* **Service Group** = a logical grouping of services.
+
+  * Groups make it easy to **bundle related services** and manage them together.
+  * Providers can offer entire groups rather than individual services.
+
+---
+
+### 2.4 Service Providers
+
+A **service provider** is an **account** that offers services or service groups.
+They can:
+
+* Override **pricing** for their offered services (per currency).
+* Route requests to their own **runners** (execution agents).
+* Manage multiple **service groups** under one provider identity.
+
+---
+
+### 2.5 Runners
+
+A **runner** is an execution agent — a node, VM, or service endpoint that can fulfill requests.
+
+* Identified by an **IPv6 address** (supports Mycelium or other overlay networks).
+* Can be owned by one or multiple providers.
+* Providers map **services/groups → runners** to define routing.
+
+---
+
+### 2.6 Subscriptions
+
+A **subscription** is **the authorization mechanism** for usage and spending control:
+
+* Links an **account** to a **service** or **service group**.
+* Defines **spending limits** (amount, currency, period: hour/day/month).
+* Restricts which **providers** are allowed to serve the subscription.
+* Uses a **secret** chosen by the subscriber — providers use this to claim charges.
+
+---
+
+### 2.7 Requests
+
+A **request** represents a single execution under a subscription:
+
+* Tied to **account**, **subscription**, **provider**, **service**, and optionally **runner**.
+* Has **status** (`pending`, `running`, `succeeded`, `failed`, `canceled`).
+* Records start/end times for duration-based billing.
+
+---
+
+### 2.8 Billing Ledger
+
+The **ledger** is **append-only** — the source of truth for all charges and credits.
+
+* Each entry records:
+
+  * `amount` (positive = debit, negative = credit/refund)
+  * `asset_code`
+  * Links to `account`, `provider`, `service`, and/or `request`
+* From the ledger, **balances** can be reconstructed at any time.
+
+---
+
+## 3) How Billing Works — Step by Step
+
+### 3.1 Setup
+
+1. **Define services** with default pricing & schemas.
+2. **Define currencies** and accepted currencies for services.
+3. **Group services** into service groups.
+4. **Onboard providers** (accounts) and associate them with service groups.
+5. **Assign runners** to services or groups for execution routing.
+
+---
+
+### 3.2 Subscription Creation
+
+1. Customer **creates a subscription**:
+
+   * Chooses service or service group.
+   * Sets **spending limit** (amount, currency, period).
+   * Chooses **secret**.
+   * Selects **allowed providers**.
+2. Subscription is stored in DB.
+
+---
+
+### 3.3 Request Execution
+
+1. Customer sends a request to broker/API with:
+
+   * `subscription_id`
+   * Target `service_id`
+   * Payload + signature using account pubkey.
+2. Broker:
+
+   * Validates **subscription active**.
+   * Validates **provider allowed**.
+   * Checks **spend limit** hasn’t been exceeded for current period.
+   * Resolves **effective price** via:
+
+     1. Provider override (currency-specific)
+     2. Service accepted currency override
+     3. Service default
+3. Broker selects **runner** from provider’s routing tables.
+4. Runner executes request and returns result.
+
+---
+
+### 3.4 Billing Entry
+
+1. When the request completes:
+
+   * If `per_second` mode → calculate `duration × rate`.
+   * If `per_request` mode → apply flat rate.
+2. Broker **inserts ledger entry**:
+
+   * Debit from customer account.
+   * Credit to provider account (can be separate entries or aggregated).
+3. Ledger is append-only — historical billing cannot be altered.
+
+---
+
+### 3.5 Balance & Tracking
+
+* **Current balances** are a sum of all ledger entries per account+currency.
+* Spend limits are enforced by **querying the ledger** for the current period before each charge.
+* Audit trails are guaranteed via immutable ledger entries.
+
+---
+
+## 4) Why This is Generic & Reusable
+
+This design **decouples**:
+
+* **Service definition** from **provider pricing** → multiple providers can sell the same service at different rates.
+* **Execution agents** (runners) from **service definitions** → easy scaling or outsourcing of execution.
+* **Billing rules** (per-second vs per-request) from **subscription limits** → same service can be sold in different billing modes.
+* **Currencies** from the service → enabling multi-asset billing without changing the service definition.
+
+Because of these separations, you can:
+
+* Reuse the model for **compute**, **APIs**, **storage**, **SaaS features**, etc.
+* Plug in different **payment backends** (on-chain, centralized payment processor, prepaid balance).
+* Use the same model for **internal cost allocation** or **external customer billing**.
+
+---
+
+## 5) Potential Extensions
+
+* **Prepaid model**: enforce that ledger debits can’t exceed balance.
+* **On-chain settlement**: periodically export ledger entries to blockchain transactions.
+* **Discount models**: percentage or fixed-amount discounts per subscription.
+* **Usage analytics**: aggregate requests/billing by time period, provider, or service.
+* **SLAs**: link billing adjustments to performance metrics in requests.
+
+---
+
+## 6) Conceptual Diagram — Billing Flow
+
+```mermaid
+sequenceDiagram
+    participant C as Customer Account
+    participant B as Broker/API
+    participant P as Provider
+    participant R as Runner
+    participant DB as Ledger DB
+
+    C->>B: Request(service, subscription, payload, secret)
+    B->>DB: Validate subscription & spend limit
+    DB-->>B: OK + effective pricing
+    B->>P: Forward request
+    P->>R: Execute request
+    R-->>P: Result + execution time
+    P->>B: Return result
+    B->>DB: Insert debit (customer) + credit (provider)
+    DB-->>B: Ledger updated
+    B-->>C: Return result + charge info
+```
--- a/specs/billingmanager_research/schema.sql
+++ b/specs/billingmanager_research/schema.sql
@@ -0,0 +1,234 @@
+-- Enable useful extensions (optional)
+CREATE EXTENSION IF NOT EXISTS pgcrypto;   -- for digests/hashes if you want
+CREATE EXTENSION IF NOT EXISTS btree_gist; -- for exclusion/partial indexes
+
+-- =========================
+-- Core: Accounts & Currency
+-- =========================
+
+CREATE TABLE accounts (
+  id               BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  pubkey           BYTEA NOT NULL UNIQUE,
+  display_name     TEXT,
+  created_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
+  CHECK (id >= 0)
+);
+
+CREATE TABLE currencies (
+  asset_code       TEXT PRIMARY KEY,               -- e.g. "USDC-ETH", "EUR", "LND"
+  name             TEXT NOT NULL,
+  symbol           TEXT,                           -- e.g. "$", "€"
+  decimals         INT  NOT NULL DEFAULT 2,        -- how many decimal places
+  UNIQUE (name)
+);
+
+-- =========================
+-- Services & Groups
+-- =========================
+
+CREATE TYPE billing_mode AS ENUM ('per_second', 'per_request');
+
+CREATE TABLE services (
+  id                   BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  name                 TEXT NOT NULL UNIQUE,
+  description          TEXT,
+  default_billing_mode billing_mode NOT NULL,
+  default_price        NUMERIC(38, 18) NOT NULL,   -- default price in "unit currency" (see accepted currencies)
+  default_currency     TEXT NOT NULL REFERENCES currencies(asset_code) ON UPDATE CASCADE,
+  max_request_seconds  INTEGER,                    -- nullable means no cap
+  schema_heroscript    TEXT,
+  schema_json          JSONB,
+  created_at           TIMESTAMPTZ NOT NULL DEFAULT now(),
+  CHECK (id >= 0),
+  CHECK (default_price >= 0),
+  CHECK (max_request_seconds IS NULL OR max_request_seconds > 0)
+);
+
+-- Accepted currencies for a service (subset + optional specific price per currency)
+CREATE TABLE service_accepted_currencies (
+  service_id      BIGINT NOT NULL REFERENCES services(id) ON DELETE CASCADE,
+  asset_code      TEXT   NOT NULL REFERENCES currencies(asset_code) ON UPDATE CASCADE,
+  price_override  NUMERIC(38, 18),                 -- if set, overrides default_price for this currency
+  billing_mode_override billing_mode,              -- if set, overrides default_billing_mode
+  PRIMARY KEY (service_id, asset_code),
+  CHECK (price_override IS NULL OR price_override >= 0)
+);
+
+CREATE TABLE service_groups (
+  id               BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  name             TEXT NOT NULL UNIQUE,
+  description      TEXT,
+  created_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
+  CHECK (id >= 0)
+);
+
+CREATE TABLE service_group_members (
+  group_id   BIGINT NOT NULL REFERENCES service_groups(id) ON DELETE CASCADE,
+  service_id BIGINT NOT NULL REFERENCES services(id)       ON DELETE RESTRICT,
+  PRIMARY KEY (group_id, service_id)
+);
+
+-- =========================
+-- Providers, Runners, Routing
+-- =========================
+
+CREATE TABLE service_providers (
+  id               BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  account_id       BIGINT NOT NULL REFERENCES accounts(id) ON DELETE CASCADE, -- provider is an account
+  name             TEXT NOT NULL,
+  description      TEXT,
+  created_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
+  UNIQUE (name),
+  CHECK (id >= 0)
+);
+
+-- Providers can offer groups (which imply their services)
+CREATE TABLE provider_service_groups (
+  provider_id BIGINT NOT NULL REFERENCES service_providers(id) ON DELETE CASCADE,
+  group_id    BIGINT NOT NULL REFERENCES service_groups(id)    ON DELETE CASCADE,
+  PRIMARY KEY (provider_id, group_id)
+);
+
+-- Providers may set per-service overrides (price/mode/max seconds) (optionally per currency)
+CREATE TABLE provider_service_overrides (
+  provider_id     BIGINT NOT NULL REFERENCES service_providers(id) ON DELETE CASCADE,
+  service_id      BIGINT NOT NULL REFERENCES services(id)          ON DELETE CASCADE,
+  asset_code      TEXT   REFERENCES currencies(asset_code) ON UPDATE CASCADE,
+  price_override  NUMERIC(38, 18),
+  billing_mode_override billing_mode,
+  max_request_seconds_override INTEGER,
+  PRIMARY KEY (provider_id, service_id, asset_code),
+  CHECK (price_override IS NULL OR price_override >= 0),
+  CHECK (max_request_seconds_override IS NULL OR max_request_seconds_override > 0)
+);
+
+-- Runners
+CREATE TABLE runners (
+  id           BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  address      INET NOT NULL,            -- IPv6 (INET supports both IPv4/IPv6; require v6 via CHECK below if you like)
+  name         TEXT NOT NULL,
+  description  TEXT,
+  pubkey       BYTEA,                    -- optional
+  created_at   TIMESTAMPTZ NOT NULL DEFAULT now(),
+  UNIQUE (address),
+  CHECK (id >= 0),
+  CHECK (family(address) = 6)            -- ensure IPv6
+);
+
+-- Runner ownership: a runner can be owned by multiple providers
+CREATE TABLE runner_owners (
+  runner_id    BIGINT NOT NULL REFERENCES runners(id)           ON DELETE CASCADE,
+  provider_id  BIGINT NOT NULL REFERENCES service_providers(id) ON DELETE CASCADE,
+  PRIMARY KEY (runner_id, provider_id)
+);
+
+-- Routing: link providers' services to specific runners
+CREATE TABLE provider_service_runners (
+  provider_id  BIGINT NOT NULL REFERENCES service_providers(id) ON DELETE CASCADE,
+  service_id   BIGINT NOT NULL REFERENCES services(id)          ON DELETE CASCADE,
+  runner_id    BIGINT NOT NULL REFERENCES runners(id)           ON DELETE CASCADE,
+  PRIMARY KEY (provider_id, service_id, runner_id)
+);
+
+-- Routing: link providers' service groups to runners
+CREATE TABLE provider_service_group_runners (
+  provider_id  BIGINT NOT NULL REFERENCES service_providers(id) ON DELETE CASCADE,
+  group_id     BIGINT NOT NULL REFERENCES service_groups(id)    ON DELETE CASCADE,
+  runner_id    BIGINT NOT NULL REFERENCES runners(id)           ON DELETE CASCADE,
+  PRIMARY KEY (provider_id, group_id, runner_id)
+);
+
+-- =========================
+-- Subscriptions & Spend Control
+-- =========================
+
+CREATE TYPE spend_period AS ENUM ('hour', 'day', 'month');
+
+-- A subscription ties an account to a specific service OR a service group, with spend limits and allowed providers
+CREATE TABLE subscriptions (
+  id                   BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  account_id           BIGINT NOT NULL REFERENCES accounts(id) ON DELETE CASCADE,
+  service_id           BIGINT REFERENCES services(id) ON DELETE CASCADE,
+  group_id             BIGINT REFERENCES service_groups(id) ON DELETE CASCADE,
+  secret               BYTEA NOT NULL,             -- caller-chosen secret (consider storing a hash instead)
+  subscription_data    JSONB,                      -- arbitrary client-supplied info
+  limit_amount         NUMERIC(38, 18),            -- allowed spend in the selected currency per period
+  limit_currency       TEXT REFERENCES currencies(asset_code) ON UPDATE CASCADE,
+  limit_period         spend_period,               -- period for the limit
+  active               BOOLEAN NOT NULL DEFAULT TRUE,
+  created_at           TIMESTAMPTZ NOT NULL DEFAULT now(),
+  -- Ensure exactly one of service_id or group_id
+  CHECK ( (service_id IS NOT NULL) <> (group_id IS NOT NULL) ),
+  CHECK (limit_amount IS NULL OR limit_amount >= 0),
+  CHECK (id >= 0)
+);
+
+-- Providers that are allowed to serve under a subscription
+CREATE TABLE subscription_providers (
+  subscription_id BIGINT NOT NULL REFERENCES subscriptions(id)    ON DELETE CASCADE,
+  provider_id     BIGINT NOT NULL REFERENCES service_providers(id) ON DELETE CASCADE,
+  PRIMARY KEY (subscription_id, provider_id)
+);
+
+-- =========================
+-- Usage, Requests & Billing
+-- =========================
+
+-- A request lifecycle record (optional but useful for auditing and max duration enforcement)
+CREATE TYPE request_status AS ENUM ('pending', 'running', 'succeeded', 'failed', 'canceled');
+
+CREATE TABLE requests (
+  id               BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  account_id       BIGINT NOT NULL REFERENCES accounts(id) ON DELETE CASCADE,
+  subscription_id  BIGINT NOT NULL REFERENCES subscriptions(id) ON DELETE RESTRICT,
+  provider_id      BIGINT NOT NULL REFERENCES service_providers(id) ON DELETE RESTRICT,
+  service_id       BIGINT NOT NULL REFERENCES services(id) ON DELETE RESTRICT,
+  runner_id        BIGINT REFERENCES runners(id) ON DELETE SET NULL,
+  request_schema   JSONB,                         -- concrete task payload (conforms to schema_json/heroscript)
+  started_at       TIMESTAMPTZ,
+  ended_at         TIMESTAMPTZ,
+  status           request_status NOT NULL DEFAULT 'pending',
+  created_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
+  CHECK (id >= 0),
+  CHECK (ended_at IS NULL OR started_at IS NULL OR ended_at >= started_at)
+);
+
+-- Billing ledger (debits/credits). Positive amount = debit to account (charge). Negative = credit/refund.
+CREATE TYPE ledger_entry_type AS ENUM ('debit', 'credit', 'adjustment');
+
+CREATE TABLE billing_ledger (
+  id             BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+  account_id     BIGINT NOT NULL REFERENCES accounts(id) ON DELETE CASCADE,
+  provider_id    BIGINT REFERENCES service_providers(id) ON DELETE SET NULL,
+  service_id     BIGINT REFERENCES services(id)          ON DELETE SET NULL,
+  request_id     BIGINT REFERENCES requests(id)          ON DELETE SET NULL,
+  amount         NUMERIC(38, 18) NOT NULL,               -- positive for debit, negative for credit
+  asset_code     TEXT NOT NULL REFERENCES currencies(asset_code) ON UPDATE CASCADE,
+  entry_type     ledger_entry_type NOT NULL,
+  description    TEXT,
+  created_at     TIMESTAMPTZ NOT NULL DEFAULT now(),
+  CHECK (id >= 0)
+);
+
+-- Optional: running balances per account/currency (materialized view or real-time view)
+-- This is a plain view; for performance, you might maintain a cached table.
+CREATE VIEW account_balances AS
+SELECT
+  account_id,
+  asset_code,
+  SUM(amount) AS balance
+FROM billing_ledger
+GROUP BY account_id, asset_code;
+
+-- =========================
+-- Helpful Indexes
+-- =========================
+
+CREATE INDEX idx_services_default_currency ON services(default_currency);
+CREATE INDEX idx_service_accepted_currencies_service ON service_accepted_currencies(service_id);
+CREATE INDEX idx_provider_overrides_service ON provider_service_overrides(service_id);
+CREATE INDEX idx_requests_account ON requests(account_id);
+CREATE INDEX idx_requests_provider ON requests(provider_id);
+CREATE INDEX idx_requests_service ON requests(service_id);
+CREATE INDEX idx_billing_account_currency ON billing_ledger(account_id, asset_code);
+CREATE INDEX idx_subscriptions_account_active ON subscriptions(account_id) WHERE active;
--- a/specs/billingmanager_research/summary.md
+++ b/specs/billingmanager_research/summary.md
@@ -0,0 +1,266 @@
+# Billing Logic — Whiteboard Version (for Devs)
+
+## 1) Inputs You Always Need
+
+* `account_id`, `subscription_id`
+* `service_id` (or group → resolved to a service at dispatch)
+* `provider_id`, `asset_code`
+* `payload` (validated against service schema)
+* (Optional) `runner_id`
+* Idempotency key for the request (client-provided)
+
+---
+
+## 2) Gatekeeping (Hard Checks)
+
+1. **Subscription**
+
+* Must be `active`.
+* Must target **exactly one** of {service, group}.
+* If group: ensure `service_id` is a member.
+
+2. **Provider Allowlist**
+
+* If `subscription_providers` exists → `provider_id` must be listed.
+
+3. **Spend Limit** (if set)
+
+* Compute window by `limit_period` (`hour`/`day`/`month`, UTC unless tenant TZ).
+* Current period spend = `SUM(ledger.amount WHERE account & currency & period)`.
+* `current_spend + estimated_charge ≤ limit_amount`.
+
+4. **Max Duration** (effective; see §3):
+
+* If billing mode is `per_second`, reject if requested/max exceeds effective cap.
+
+---
+
+## 3) Effective Pricing (Single Resolution Function)
+
+Inputs: `provider_id`, `service_id`, `asset_code`
+
+Precedence:
+
+1. `provider_service_overrides` for `(service_id, asset_code)`
+2. `service_accepted_currencies` for `(service_id, asset_code)`
+3. `services` defaults
+
+Outputs:
+
+* `effective_billing_mode ∈ {per_request, per_second}`
+* `effective_price` (NUMERIC)
+* `effective_max_request_seconds` (nullable)
+
+---
+
+## 4) Request Lifecycle (States)
+
+* `pending` → `running` → (`succeeded` | `failed` | `canceled`)
+* Timestamps: set `started_at` on `running`, `ended_at` on terminal states.
+* Enforce `ended_at ≥ started_at` and `duration ≤ effective_max_request_seconds` (if set).
+
+---
+
+## 5) Charging Rules
+
+### A) Per Request
+
+```
+charge = effective_price
+```
+
+### B) Per Second
+
+```
+duration_seconds = ceil(extract(epoch from (ended_at - started_at)))
+charge = duration_seconds * effective_price
+```
+
+* Cap with `effective_max_request_seconds` if present.
+* If ended early/failed before `started_at`: charge = 0.
+
+---
+
+## 6) Idempotency & Atomicity
+
+* **Idempotency key** per `(account_id, subscription_id, provider_id, service_id, request_external_id)`; store on `requests` and enforce unique index.
+* **Single transaction** to:
+
+  1. finalize `REQUESTS` status + timestamps,
+  2. insert **one** debit entry into `billing_ledger`.
+* Never mutate ledger entries; use compensating **credit** entries for adjustments/refunds.
+
+---
+
+## 7) Spend-Limit Enforcement (Before Charging)
+
+Pseudocode (SQL-ish):
+
+```sql
+WITH window AS (
+  SELECT tsrange(period_start(:limit_period), period_end(:limit_period)) AS w
+),
+spent AS (
+  SELECT COALESCE(SUM(amount), 0) AS total
+  FROM billing_ledger, window
+  WHERE account_id = :account_id
+    AND asset_code = :asset_code
+    AND created_at <@ (SELECT w FROM window)
+),
+check AS (
+  SELECT (spent.total + :estimated_charge) <= :limit_amount AS ok FROM spent
+)
+SELECT ok FROM check;
+```
+
+* If not ok → reject before dispatch, or allow but **set hard cap** on max seconds and auto-stop at limit.
+
+---
+
+## 8) Suggested DB Operations (Happy Path)
+
+1. **Create request**
+
+```sql
+INSERT INTO requests (...)
+VALUES (...)
+ON CONFLICT (idempotency_key) DO NOTHING
+RETURNING id;
+```
+
+2. **Start execution**
+
+```sql
+UPDATE requests
+SET status='running', started_at=now()
+WHERE id=:id AND status='pending';
+```
+
+3. **Finish & bill** (single transaction)
+
+```sql
+BEGIN;
+
+-- lock for update to avoid double-billing
+UPDATE requests
+SET status=:final_status, ended_at=now()
+WHERE id=:id AND status='running'
+RETURNING started_at, ended_at;
+
+-- compute charge in app (see §5), re-check spend window here
+
+INSERT INTO billing_ledger (
+  account_id, provider_id, service_id, request_id,
+  amount, asset_code, entry_type, description
+) VALUES (
+  :account_id, :provider_id, :service_id, :id,
+  :charge, :asset_code, 'debit', :desc
+);
+
+COMMIT;
+```
+
+---
+
+## 9) Balances & Reporting
+
+* **Current balance** = `SUM(billing_ledger.amount) GROUP BY account_id, asset_code`.
+* Keep a **view** or **materialized view**; refresh asynchronously if needed.
+* Never rely on cached balance for hard checks — re-check within the billing transaction if **prepaid** semantics are required.
+
+---
+
+## 10) Error & Edge Rules
+
+* If runner fails before `running` → no charge.
+* If runner starts, then fails:
+
+  * **per\_second**: bill actual seconds (can be 0).
+  * **per\_request**: default is **no charge** unless policy says otherwise; if charging partials, document it.
+* Partial refunds/adjustments → insert **negative** ledger entries (type `credit`/`adjustment`) tied to the original `request_id`.
+
+---
+
+## 11) Minimal Pricing Resolver (Sketch)
+
+```sql
+WITH p AS (
+  SELECT price_override AS price,
+         billing_mode_override AS mode,
+         max_request_seconds_override AS maxsec
+  FROM provider_service_overrides
+  WHERE provider_id = :pid AND service_id = :sid AND asset_code = :asset
+  LIMIT 1
+),
+sac AS (
+  SELECT price_override AS price,
+         billing_mode_override AS mode
+  FROM service_accepted_currencies
+  WHERE service_id = :sid AND asset_code = :asset
+  LIMIT 1
+),
+svc AS (
+  SELECT default_price AS price,
+         default_billing_mode AS mode,
+         max_request_seconds AS maxsec
+  FROM services WHERE id = :sid
+)
+SELECT
+  COALESCE(p.price, sac.price, svc.price) AS price,
+  COALESCE(p.mode,  sac.mode,  svc.mode)  AS mode,
+  COALESCE(p.maxsec, svc.maxsec)          AS max_seconds;
+```
+
+---
+
+## 12) Mermaid — Decision Trees
+
+### Pricing & Duration
+
+```mermaid
+flowchart TD
+    A[provider_id, service_id, asset_code] --> B{Provider override exists?}
+    B -- yes --> P[Use provider price/mode/max]
+    B -- no --> C{Service currency override?}
+    C -- yes --> S[Use service currency price/mode]
+    C -- no --> D[Use service defaults]
+    P --> OUT[effective price/mode/max]
+    S --> OUT
+    D --> OUT
+```
+
+### Spend Check & Charge
+
+```mermaid
+flowchart TD
+    S[Has subscription limit?] -->|No| D1[Dispatch]
+    S -->|Yes| C{current_spend + est_charge <= limit?}
+    C -->|No| REJ[Reject or cap duration]
+    C -->|Yes| D1[Dispatch]
+    D1 --> RUN[Run request]
+    RUN --> DONE[Finalize + insert ledger]
+```
+
+---
+
+## 13) Security Posture
+
+* Store **hash of subscription secret**; compare hash on use.
+* Sign client requests with **account pubkey**; verify before dispatch.
+* Limit **request schema** to validated fields; reject unknowns.
+* Enforce **IPv6** for runners where required.
+
+---
+
+## 14) What To Implement First
+
+1. Pricing resolver (single function).
+2. Spend-window checker (single query).
+3. Request lifecycle + idempotency.
+4. Ledger write (append-only) + balances view.
+
+Everything else layers on top.
+
+---
+
+If you want, I can turn this into a small **README.md** with code blocks you can paste into the repo (plus a couple of SQL functions and example tests).
--- a/specs/models_marketplace/main/currency.v
+++ b/specs/models_marketplace/main/currency.v
@@ -24,16 +24,6 @@ pub enum CurrencyType {
 	custom
 }

-pub struct Price {
-pub mut:
-	base_amount          f64 // Using f64 for Decimal
-	base_currency        string
-	display_currency     string
-	display_amount       f64 // Using f64 for Decimal
-	formatted_display    string
-	conversion_rate      f64 // Using f64 for Decimal
-	conversion_timestamp u64 // Unix timestamp
-}

 pub struct MarketplaceCurrencyConfig {
 pub mut:
--- a/specs/models_old/biz/company.v
+++ b/specs/models_old/biz/company.v
--- a/specs/models_old/biz/payment.v
+++ b/specs/models_old/biz/payment.v
--- a/specs/models_old/biz/product.v
+++ b/specs/models_old/biz/product.v
--- a/specs/models_old/biz/sale.v
+++ b/specs/models_old/biz/sale.v
--- a/specs/models_old/biz/shareholder.v
+++ b/specs/models_old/biz/shareholder.v
--- a/specs/models_old/calendar/calendar.v
+++ b/specs/models_old/calendar/calendar.v
--- a/specs/models_old/calendar/contacts.v
+++ b/specs/models_old/calendar/contacts.v
--- a/specs/models_old/calendar/event.v
+++ b/specs/models_old/calendar/event.v
--- a/specs/models_old/calendar/message.v
+++ b/specs/models_old/calendar/message.v
--- a/specs/models_old/circle/circle.v
+++ b/specs/models_old/circle/circle.v
--- a/specs/models_old/circle/member.v
+++ b/specs/models_old/circle/member.v
--- a/specs/models_old/circle/name.v
+++ b/specs/models_old/circle/name.v
--- a/specs/models_old/circle/wallet.v
+++ b/specs/models_old/circle/wallet.v
--- a/specs/models_old/core/base.v
+++ b/specs/models_old/core/base.v
--- a/specs/models_old/core/comment.v
+++ b/specs/models_old/core/comment.v
--- a/specs/models_old/finance/account.v
+++ b/specs/models_old/finance/account.v
--- a/specs/models_old/finance/asset.v
+++ b/specs/models_old/finance/asset.v
--- a/specs/models_old/finance/marketplace.v
+++ b/specs/models_old/finance/marketplace.v
--- a/specs/models_old/gov/committee.v
+++ b/specs/models_old/gov/committee.v
--- a/specs/models_old/gov/company.v
+++ b/specs/models_old/gov/company.v
--- a/specs/models_old/gov/meeting.v
+++ b/specs/models_old/gov/meeting.v
--- a/specs/models_old/gov/resolution.v
+++ b/specs/models_old/gov/resolution.v
--- a/specs/models_old/gov/shareholder.v
+++ b/specs/models_old/gov/shareholder.v
--- a/specs/models_old/gov/types.v
+++ b/specs/models_old/gov/types.v
--- a/specs/models_old/gov/user.v
+++ b/specs/models_old/gov/user.v
--- a/specs/models_old/gov/vote.v
+++ b/specs/models_old/gov/vote.v
--- a/specs/models_old/governance/activity.v
+++ b/specs/models_old/governance/activity.v
--- a/specs/models_old/governance/attached_file.v
+++ b/specs/models_old/governance/attached_file.v
--- a/specs/models_old/governance/committee.v
+++ b/specs/models_old/governance/committee.v
--- a/specs/models_old/governance/company.v
+++ b/specs/models_old/governance/company.v
--- a/specs/models_old/governance/meeting.v
+++ b/specs/models_old/governance/meeting.v
--- a/specs/models_old/governance/proposal.v
+++ b/specs/models_old/governance/proposal.v
--- a/specs/models_old/governance/resolution.v
+++ b/specs/models_old/governance/resolution.v
--- a/specs/models_old/governance/user.v
+++ b/specs/models_old/governance/user.v
--- a/specs/models_old/governance/vote.v
+++ b/specs/models_old/governance/vote.v
--- a/specs/models_old/legal/contract.v
+++ b/specs/models_old/legal/contract.v
--- a/specs/models_old/library/book.v
+++ b/specs/models_old/library/book.v
--- a/specs/models_old/library/collection.v
+++ b/specs/models_old/library/collection.v
--- a/specs/models_old/library/image.v
+++ b/specs/models_old/library/image.v
--- a/specs/models_old/library/markdown.v
+++ b/specs/models_old/library/markdown.v
--- a/specs/models_old/library/pdf.v
+++ b/specs/models_old/library/pdf.v
--- a/specs/models_old/library/slideshow.v
+++ b/specs/models_old/library/slideshow.v
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Timur Gordon	53e9a2d4f0	update grid4 & heroledger models	2025-09-16 14:18:08 +02:00
timur	cb1fb0f0ec	Merge pull request 'main' (#13 ) from main into development Reviewed-on: #13	2025-08-28 14:05:57 +00:00
despiegk	97c24d146b	...	2025-08-27 18:52:11 +02:00
despiegk	6bff52e8b7	...	2025-08-27 14:44:39 +02:00
despiegk	7a999b7b6e	Merge branch 'main' of git.ourworld.tf:herocode/db	2025-08-21 17:26:42 +02:00
despiegk	095a4d0c69	...	2025-08-21 17:26:40 +02:00
Timur Gordon	a7c978efd4	use git paths for deps instead	2025-08-21 14:35:07 +02:00
Timur Gordon	0b0d546b4e	remove old cargo lock	2025-08-21 14:27:52 +02:00
Timur Gordon	2f5e18df98	reexport heroledger	2025-08-21 14:20:25 +02:00
Timur Gordon	77169c073c	clean old deps	2025-08-21 14:17:37 +02:00
Timur Gordon	ce12f26a91	cargo fix & fix heroledger	2025-08-21 14:15:29 +02:00
Timur Gordon	130822b69b	Merge branch 'development' of https://git.ourworld.tf/herocode/db into development	2025-08-21 14:06:40 +02:00
Timur Gordon	7439980b33	Merge branch 'main' into development	2025-08-21 14:05:57 +02:00
Maxime Van Hees	453e86edd2	fixed dependencies issues on main branch which is called 'development'	2025-08-05 13:11:53 +02:00