New alert service

services/orchestrator/app/api/orchestration.py

@@ -303,3 +303,44 @@ async def list_orchestration_runs(
                     tenant_id=tenant_id,
                     error=str(e))
         raise HTTPException(status_code=500, detail=str(e))
+
+
+@router.get("/last-run")
+async def get_last_orchestration_run(
+    tenant_id: str,
+    db: AsyncSession = Depends(get_db)
+):
+    """
+    Get timestamp of last orchestration run
+
+    Lightweight endpoint for health status frontend migration (Phase 4).
+    Returns only timestamp and run number for the most recent completed run.
+
+    Args:
+        tenant_id: Tenant ID
+
+    Returns:
+        Dict with timestamp and runNumber (or None if no runs)
+    """
+    try:
+        tenant_uuid = uuid.UUID(tenant_id)
+        repo = OrchestrationRunRepository(db)
+
+        # Get most recent completed run
+        latest_run = await repo.get_latest_run_for_tenant(tenant_uuid)
+
+        if not latest_run:
+            return {"timestamp": None, "runNumber": None}
+
+        return {
+            "timestamp": latest_run.started_at.isoformat() if latest_run.started_at else None,
+            "runNumber": latest_run.run_number
+        }
+
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=f"Invalid tenant ID: {str(e)}")
+    except Exception as e:
+        logger.error("Error getting last orchestration run",
+                    tenant_id=tenant_id,
+                    error=str(e))
+        raise HTTPException(status_code=500, detail=str(e))