audit-log: expose total count in /api/audit-log response

Per iris's dashboard-side ask: return { entries, total } instead of a
bare array so the UI can show 'latest 500 of N' rather than silently
capping at the clamp. Adds AuditLog::count_total().

hive-c0re/src/audit_log.rs

@@ -168,6 +168,14 @@ impl AuditLog {
         Ok(out)
     }
 
+    /// Total row count, regardless of the `list_recent` clamp. Lets the
+    /// dashboard show "latest N of TOTAL" instead of silently capping.
+    pub fn count_total(&self) -> Result<i64> {
+        let conn = self.conn.lock().unwrap();
+        let n: i64 = conn.query_row("SELECT COUNT(*) FROM audit_log", [], |r| r.get(0))?;
+        Ok(n)
+    }
+
     /// Drop rows older than the retention window. Returns the number of
     /// rows deleted. Called from the hourly vacuum loop.
     pub fn vacuum(&self) -> Result<u64> {
@@ -255,6 +263,7 @@ mod tests {
         assert!(rows[1].detail.is_none());
         assert_eq!(rows[0].agent, "atlas");
         assert_eq!(rows[0].action, "restart_infra");
+        assert_eq!(db.count_total().expect("count"), 2);
     }
 
     #[test]

hive-c0re/src/dashboard.rs

@@ -1315,12 +1315,21 @@ async fn api_container_resources() -> Response {
 
 /// `GET /api/audit-log` — most-recent agent-initiated privileged-action
 /// audit entries, newest first (server-clamped to 500). Backs the
-/// operator dashboard's audit view. Returns `Vec<AuditEntry>` JSON.
+/// operator dashboard's audit view. Returns
+/// `{ "entries": [AuditEntry…], "total": N }` so the UI can show
+/// "latest 500 of N" rather than silently capping. `ts_unix` is in
+/// **seconds**.
 async fn api_audit_log(State(state): State<AppState>) -> Response {
-    match state.coord.audit_log.list_recent(500) {
-        Ok(rows) => axum::Json(rows).into_response(),
-        Err(e) => error_response(&format!("audit-log: {e:#}")),
-    }
+    const LIMIT: usize = 500;
+    let entries = match state.coord.audit_log.list_recent(LIMIT) {
+        Ok(rows) => rows,
+        Err(e) => return error_response(&format!("audit-log: {e:#}")),
+    };
+    let total = match state.coord.audit_log.count_total() {
+        Ok(n) => n,
+        Err(e) => return error_response(&format!("audit-log count: {e:#}")),
+    };
+    axum::Json(serde_json::json!({ "entries": entries, "total": total })).into_response()
 }
 
 /// Validate that a path-param agent name conforms to the hyperhive