feat(backend): add endedAt field to track execution completion time

- Added endedAt field to AgentGraphExecution schema
- Set endedAt when execution reaches terminal status (COMPLETED, FAILED, TERMINATED)
- Updated from_db() to use endedAt instead of updatedAt for ended_at
- Migration backfills endedAt with updatedAt for existing records
- This fixes the issue where updatedAt changed when adding correctness scores
- Chart grouping uses createdAt (when queued), endedAt tracks when execution actually finished

autogpt_platform/backend/backend/data/execution.py

@@ -230,7 +230,7 @@ class GraphExecutionMeta(BaseDbModel):
     @staticmethod
     def from_db(_graph_exec: AgentGraphExecution):
         start_time = _graph_exec.startedAt
-        end_time = _graph_exec.updatedAt
+        end_time = _graph_exec.endedAt
 
         try:
             stats = GraphExecutionStats.model_validate(_graph_exec.stats)
@@ -898,6 +898,14 @@ async def update_graph_execution_stats(
 
     if status:
         update_data["executionStatus"] = status
+        # Set endedAt when execution reaches a terminal status
+        terminal_statuses = [
+            ExecutionStatus.COMPLETED,
+            ExecutionStatus.FAILED,
+            ExecutionStatus.TERMINATED,
+        ]
+        if status in terminal_statuses:
+            update_data["endedAt"] = datetime.now(tz=timezone.utc)
 
     where_clause: AgentGraphExecutionWhereInput = {"id": graph_exec_id}
 

autogpt_platform/backend/migrations/20260113170839_add_ended_at_to_agent_graph_execution/migration.sql

@@ -0,0 +1,5 @@
+-- AlterTable
+ALTER TABLE "platform"."AgentGraphExecution" ADD COLUMN "endedAt" TIMESTAMP(3);
+
+-- Set endedAt to updatedAt for existing records
+UPDATE "platform"."AgentGraphExecution" SET "endedAt" = "updatedAt" WHERE "endedAt" IS NULL;

autogpt_platform/backend/schema.prisma

@@ -383,6 +383,7 @@ model AgentGraphExecution {
   createdAt DateTime  @default(now())
   updatedAt DateTime? @updatedAt
   startedAt DateTime?
+  endedAt   DateTime?
 
   isDeleted Boolean @default(false)