Fix: UTC fuer interne Timer, Berlin nur fuer Anzeige

Korrektur: Alle DB-Timestamps (refresh_log, created_at, updated_at,
auth, notifications) bleiben UTC fuer korrekte Timer-Vergleiche.
Europe/Berlin nur fuer angezeigte Werte (Exporte, Prompts, API).
Verhindert zu fruehes Ausloesen des Auto-Refresh-Timers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/agents/orchestrator.py

@@ -3,7 +3,7 @@ import asyncio
 import json
 import logging
 import re
-from datetime import datetime
+from datetime import datetime, timezone
 from config import TIMEZONE
 from typing import Optional
 from urllib.parse import urlparse, urlunparse
@@ -206,7 +206,7 @@ async def _create_notifications_for_incident(
     if not notifications:
         return
 
-    now = datetime.now(TIMEZONE).strftime('%Y-%m-%d %H:%M:%S')
+    now = datetime.now(timezone.utc).strftime('%Y-%m-%d %H:%M:%S')
 
     if visibility == "public" and tenant_id:
         cursor = await db.execute(
@@ -465,7 +465,7 @@ class AgentOrchestrator:
             await db.execute(
                 """UPDATE refresh_log SET status = 'cancelled', error_message = 'Vom Nutzer abgebrochen',
                    completed_at = ? WHERE incident_id = ? AND status = 'running'""",
-                (datetime.now(TIMEZONE).strftime('%Y-%m-%d %H:%M:%S'), incident_id),
+                (datetime.now(timezone.utc).strftime('%Y-%m-%d %H:%M:%S'), incident_id),
             )
             await db.commit()
         except Exception as e:
@@ -481,7 +481,7 @@ class AgentOrchestrator:
             await db.execute(
                 """UPDATE refresh_log SET status = 'error', error_message = ?,
                    completed_at = ? WHERE incident_id = ? AND status = 'running'""",
-                (error[:500], datetime.now(TIMEZONE).strftime('%Y-%m-%d %H:%M:%S'), incident_id),
+                (error[:500], datetime.now(timezone.utc).strftime('%Y-%m-%d %H:%M:%S'), incident_id),
             )
             await db.commit()
         except Exception as e:
@@ -542,12 +542,12 @@ class AgentOrchestrator:
                 await db.execute(
                     """UPDATE refresh_log SET status = 'error', error_message = 'Retry gestartet',
                        completed_at = ? WHERE incident_id = ? AND status = 'running'""",
-                    (datetime.now(TIMEZONE).strftime('%Y-%m-%d %H:%M:%S'), incident_id),
+                    (datetime.now(timezone.utc).strftime('%Y-%m-%d %H:%M:%S'), incident_id),
                 )
                 await db.commit()
 
             # Refresh-Log starten
-            now = datetime.now(TIMEZONE).strftime('%Y-%m-%d %H:%M:%S')
+            now = datetime.now(timezone.utc).strftime('%Y-%m-%d %H:%M:%S')
             cursor = await db.execute(
                 "INSERT INTO refresh_log (incident_id, started_at, status, trigger_type, retry_count, tenant_id) VALUES (?, ?, 'running', ?, ?, ?)",
                 (incident_id, now, trigger_type, retry_count, tenant_id),
@@ -1008,7 +1008,7 @@ class AgentOrchestrator:
                     cache_creation_tokens = ?, cache_read_tokens = ?,
                     total_cost_usd = ?, api_calls = ?
                 WHERE id = ?""",
-                (datetime.now(TIMEZONE).strftime('%Y-%m-%d %H:%M:%S'), new_count,
+                (datetime.now(timezone.utc).strftime('%Y-%m-%d %H:%M:%S'), new_count,
                  usage_acc.input_tokens, usage_acc.output_tokens,
                  usage_acc.cache_creation_tokens, usage_acc.cache_read_tokens,
                  round(usage_acc.total_cost_usd, 7), usage_acc.call_count, log_id),