DB-Migrationen (status_history, category) + Claude CLI stdin-Übergabe

- status_history Spalte für fact_checks (Faktencheck-Verlauf als JSON)
- category Spalte für article_locations (Marker-Klassifizierung)
- Prompt-Übergabe an Claude CLI via stdin statt Argument (ARG_MAX)

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

src/database.py

@@ -350,6 +350,26 @@ async def init_db():
             await db.execute("ALTER TABLE fact_checks ADD COLUMN tenant_id INTEGER REFERENCES organizations(id)")
             await db.commit()
 
+        # Migration: status_history fuer fact_checks (Faktencheck-Verlauf)
+        if "status_history" not in fc_columns:
+            await db.execute("ALTER TABLE fact_checks ADD COLUMN status_history TEXT DEFAULT '[]'")
+            # Bestehende Eintraege initialisieren
+            cursor2 = await db.execute("SELECT id, status, checked_at FROM fact_checks")
+            for row2 in await cursor2.fetchall():
+                import json as _json
+                initial_history = _json.dumps([{"status": row2[1], "at": str(row2[2])}])
+                await db.execute("UPDATE fact_checks SET status_history = ? WHERE id = ?", (initial_history, row2[0]))
+            await db.commit()
+            logger.info("Migration: status_history zu fact_checks hinzugefuegt")
+
+        # Migration: category fuer article_locations (Marker-Klassifizierung)
+        cursor = await db.execute("PRAGMA table_info(article_locations)")
+        al_columns = [row[1] for row in await cursor.fetchall()]
+        if "category" not in al_columns:
+            await db.execute("ALTER TABLE article_locations ADD COLUMN category TEXT DEFAULT 'mentioned'")
+            await db.commit()
+            logger.info("Migration: category zu article_locations hinzugefuegt")
+
         # Migration: tenant_id fuer incident_snapshots
         cursor = await db.execute("PRAGMA table_info(incident_snapshots)")
         snap_columns2 = [row[1] for row in await cursor.fetchall()]