diff --git a/herodb/Cargo.toml b/herodb/Cargo.toml
index b503016..2dd1c57 100644
--- a/herodb/Cargo.toml
+++ b/herodb/Cargo.toml
@@ -25,3 +25,7 @@ paste = "1.0"
 [[example]]
 name = "rhai_demo"
 path = "examples/rhai_demo.rs"
+
+[[bin]]
+name = "dbexample2"
+path = "src/cmd/dbexample2/main.rs"
diff --git a/herodb/src/db/model_methods.rs b/herodb/src/db/model_methods.rs
index 415a610..45fffd7 100644
--- a/herodb/src/db/model_methods.rs
+++ b/herodb/src/db/model_methods.rs
@@ -1,9 +1,7 @@
 use crate::db::db::DB;
 use crate::db::base::{SledDBResult, SledModel};
 use crate::impl_model_methods;
-use crate::models::biz::product::Product;
-use crate::models::biz::sale::Sale;
-use crate::models::biz::Currency;
+use crate::models::biz::{Product, Sale, Currency};
 
 // Implement model-specific methods for Product
 impl_model_methods!(Product, product, products);
diff --git a/herodb/src/models/biz/mod.rs b/herodb/src/models/biz/mod.rs
new file mode 100644
index 0000000..c7c3372
--- /dev/null
+++ b/herodb/src/models/biz/mod.rs
@@ -0,0 +1,13 @@
+pub mod currency;
+pub mod product;
+pub mod sale;
+
+// Re-export all model types for convenience
+pub use product::{Product, ProductComponent, ProductType, ProductStatus};
+pub use sale::{Sale, SaleItem, SaleStatus};
+pub use currency::Currency;
+
+// Re-export builder types
+pub use product::{ProductBuilder, ProductComponentBuilder};
+pub use sale::{SaleBuilder, SaleItemBuilder};
+pub use currency::CurrencyBuilder;
\ No newline at end of file