fix(dashboard,server): restore code change ledger UI and enrich model schema parity and pagination

server/src/api/setup.rs

@@ -235,6 +235,26 @@ pub fn create_router(app_state: Arc<AppState>) -> Router {
                 }
             }),
         )
+        .route(
+            "/api/ledger",
+            get({
+                let state_clone = app_state.handler.state.clone();
+                move |axum::extract::Query(params): axum::extract::Query<
+                    std::collections::HashMap<String, String>,
+                >| async move {
+                    let limit = params
+                        .get("limit")
+                        .and_then(|l| l.parse::<usize>().ok())
+                        .unwrap_or(100);
+
+                    let json = state_clone.code.ledger.read_with(|items| {
+                        let recent: Vec<_> = items.iter().rev().take(limit).collect();
+                        serde_json::to_string(&recent).unwrap_or_else(|_| "[]".to_string())
+                    });
+                    ([(axum::http::header::CONTENT_TYPE, "application/json")], json)
+                }
+            }),
+        )
         .route(
             "/api/tech_debts",
             get({
@@ -265,6 +285,26 @@ pub fn create_router(app_state: Arc<AppState>) -> Router {
                 }
             }),
         )
+        .route(
+            "/api/session_summaries",
+            get({
+                let state_clone = app_state.handler.state.clone();
+                move |axum::extract::Query(params): axum::extract::Query<
+                    std::collections::HashMap<String, String>,
+                >| async move {
+                    let limit = params
+                        .get("limit")
+                        .and_then(|l| l.parse::<usize>().ok())
+                        .unwrap_or(100);
+
+                    let json = state_clone.telemetry.session_summaries.read_with(|items| {
+                        let recent: Vec<_> = items.iter().rev().take(limit).collect();
+                        serde_json::to_string(&recent).unwrap_or_else(|_| "[]".to_string())
+                    });
+                    ([(axum::http::header::CONTENT_TYPE, "application/json")], json)
+                }
+            }),
+        )
         .route(
             "/api/milestones",
             get({
@@ -789,4 +829,83 @@ mod tests {
         assert!(js_str.contains("/api/activity/stream"));
         assert!(js_str.contains("parseActivityPayload"));
     }
+
+    #[tokio::test]
+    async fn test_ledger_endpoint() {
+        let (app, app_state, _dir) = setup_app().await;
+
+        app_state.handler.state.code.ledger.modify(|l| {
+            l.push(crate::models::CodeChange {
+                timestamp: 1728000000,
+                file_path: "src/main.rs".to_string(),
+                description: "Test commit 1".to_string(),
+                git_commit: Some("abc1234".to_string()),
+                ..Default::default()
+            });
+            l.push(crate::models::CodeChange {
+                timestamp: 1728000100,
+                file_path: "src/lib.rs".to_string(),
+                description: "Test commit 2".to_string(),
+                git_commit: Some("def5678".to_string()),
+                ..Default::default()
+            });
+        });
+
+        let request = Request::builder()
+            .uri("/api/ledger?limit=1")
+            .body(Body::empty())
+            .unwrap();
+
+        let response = app.oneshot(request).await.unwrap();
+        assert_eq!(response.status(), StatusCode::OK);
+
+        let body_bytes = axum::body::to_bytes(response.into_body(), usize::MAX)
+            .await
+            .unwrap();
+        let changes: Vec<crate::models::CodeChange> = serde_json::from_slice(&body_bytes).unwrap();
+        assert_eq!(changes.len(), 1);
+        assert_eq!(changes[0].description, "Test commit 2");
+    }
+
+    #[tokio::test]
+    async fn test_session_summaries_endpoint() {
+        let (app, app_state, _dir) = setup_app().await;
+
+        app_state
+            .handler
+            .state
+            .telemetry
+            .session_summaries
+            .modify(|summaries| {
+                summaries.push(crate::models::SessionSummary {
+                    session_id: Some("session-1".to_string()),
+                    summary: "Session 1 summary".to_string(),
+                    namespace: "test".to_string(),
+                    timestamp: 100,
+                    ..Default::default()
+                });
+                summaries.push(crate::models::SessionSummary {
+                    session_id: Some("session-2".to_string()),
+                    summary: "Session 2 summary".to_string(),
+                    namespace: "test".to_string(),
+                    timestamp: 200,
+                    ..Default::default()
+                });
+            });
+
+        let request = Request::builder()
+            .uri("/api/session_summaries?limit=1")
+            .body(Body::empty())
+            .unwrap();
+
+        let response = app.oneshot(request).await.unwrap();
+        assert_eq!(response.status(), StatusCode::OK);
+
+        let body_bytes = axum::body::to_bytes(response.into_body(), usize::MAX)
+            .await
+            .unwrap();
+        let summaries: Vec<crate::models::SessionSummary> = serde_json::from_slice(&body_bytes).unwrap();
+        assert_eq!(summaries.len(), 1);
+        assert_eq!(summaries[0].summary, "Session 2 summary");
+    }
 }