Perf: Executive Summary nach Refresh im Hintergrund vorberechnen

Statt beim PDF-Export 30+ Sekunden auf die KI-Zusammenfassung zu
warten, wird sie jetzt automatisch nach jedem Refresh generiert.
Beim Export ist sie dann sofort verfuegbar (gecacht in DB).
Summary-Aenderungen invalidieren den Cache automatisch.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/agents/orchestrator.py

@@ -1174,7 +1174,7 @@ class AgentOrchestrator:
                     sources_json = json.dumps(sources, ensure_ascii=False) if sources else previous_sources_json
 
                     await db.execute(
-                        "UPDATE incidents SET summary = ?, sources_json = ?, updated_at = ? WHERE id = ?",
+                        "UPDATE incidents SET summary = ?, sources_json = ?, executive_summary = NULL, updated_at = ? WHERE id = ?",
                         (new_summary, sources_json, now, incident_id),
                     )
 
@@ -1470,6 +1470,33 @@ class AgentOrchestrator:
 
             logger.info(f"Refresh für Lage {incident_id} abgeschlossen: {new_count} neue Artikel")
 
+            # Executive Summary im Hintergrund vorab generieren (fuer schnelleren Export)
+            if new_count > 0:
+                async def _pregenerate_exec_summary():
+                    try:
+                        from report_generator import generate_executive_summary
+                        from database import get_db
+                        _db = await get_db()
+                        try:
+                            cursor = await _db.execute(
+                                "SELECT summary, executive_summary FROM incidents WHERE id = ?",
+                                (incident_id,),
+                            )
+                            _row = await cursor.fetchone()
+                            if _row and _row["summary"] and not _row["executive_summary"]:
+                                es = await generate_executive_summary(_row["summary"])
+                                await _db.execute(
+                                    "UPDATE incidents SET executive_summary = ? WHERE id = ?",
+                                    (es, incident_id),
+                                )
+                                await _db.commit()
+                                logger.info(f"Executive Summary fuer Lage {incident_id} vorberechnet")
+                        finally:
+                            await _db.close()
+                    except Exception as e:
+                        logger.warning(f"Executive Summary Vorberechnung fehlgeschlagen: {e}")
+                asyncio.create_task(_pregenerate_exec_summary())
+
         finally:
             await db.close()