Add basic models

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

src/models/flow.rs

@@ -0,0 +1,33 @@
+use std::collections::HashMap;
+
+use serde::{Deserialize, Serialize};
+
+use crate::time::Timestamp;
+
+#[derive(Serialize, Deserialize)]
+pub struct Flow {
+    /// Job Id set tby the actor which created it
+    id: u32,
+    /// Actor Id who created this job
+    caller_id: u32,
+    /// The context in which this job is executed
+    context_id: u32,
+    /// List of jobs which make up the flow
+    jobs: Vec<u32>,
+    /// Environment variables, passed to every job when executed
+    env_vars: HashMap<String, String>,
+    /// The result of the flow
+    result: HashMap<String, String>,
+    created_at: Timestamp,
+    updated_at: Timestamp,
+    status: FlowStatus,
+}
+
+/// The status of a flow
+#[derive(Serialize, Deserialize)]
+pub enum FlowStatus {
+    Dispatched,
+    Started,
+    Error,
+    Finished,
+}