date fx

backend/src/api/routes/assistant/_admin_routes.py

@@ -8,7 +8,7 @@
 
 from __future__ import annotations
 
-from datetime import UTC, datetime
+from datetime import datetime
 from typing import Any
 
 from fastapi import Depends, HTTPException, Query
@@ -69,7 +69,7 @@ async def list_conversations(
             conv_id = row.conversation_id
             if not conv_id:
                 continue
-            created_at = row.created_at or datetime.now(UTC)
+            created_at = row.created_at or datetime.now()
             if conv_id not in summary:
                 summary[conv_id] = {
                     "conversation_id": conv_id,

backend/src/api/routes/assistant/_history.py

@@ -301,7 +301,7 @@ def _resolve_or_create_conversation(
 # @PRE  db session is available and user_id references current actor scope.
 # @POST  Messages older than ASSISTANT_MESSAGE_TTL_DAYS are removed from persistence and memory mirrors.
 def _cleanup_history_ttl(db: Session, user_id: str):
-    cutoff = datetime.now(UTC) - timedelta(days=ASSISTANT_MESSAGE_TTL_DAYS)
+    cutoff = datetime.now() - timedelta(days=ASSISTANT_MESSAGE_TTL_DAYS)
     try:
         query = db.query(AssistantMessageRecord).filter(
             AssistantMessageRecord.user_id == user_id,
@@ -323,8 +323,11 @@ def _cleanup_history_ttl(db: Session, user_id: str):
         kept = []
         for item in items:
             created_at = item.get("created_at")
-            if isinstance(created_at, datetime) and created_at < cutoff:
-                continue
+            if isinstance(created_at, datetime):
+                # DB stores naive datetimes; in-memory items may be aware (from datetime.now(UTC))
+                ref = created_at.replace(tzinfo=None) if created_at.tzinfo else created_at
+                if ref < cutoff:
+                    continue
             kept.append(item)
         if kept:
             CONVERSATIONS[key] = kept
@@ -344,8 +347,10 @@ def _cleanup_history_ttl(db: Session, user_id: str):
 def _is_conversation_archived(updated_at: datetime | None) -> bool:
     if not updated_at:
         return False
-    cutoff = datetime.now(UTC) - timedelta(days=ASSISTANT_ARCHIVE_AFTER_DAYS)
-    return updated_at < cutoff
+    cutoff = datetime.now() - timedelta(days=ASSISTANT_ARCHIVE_AFTER_DAYS)
+    # Ensure both operands are naive (DB stores naive datetimes)
+    ref = updated_at.replace(tzinfo=None) if updated_at.tzinfo else updated_at
+    return ref < cutoff
 
 
 # #endregion _is_conversation_archived