feat: cron jobs — daily summary, speaker clustering, clip purge

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

app/cron/main.py

@@ -0,0 +1,35 @@
+import time
+from datetime import datetime, timezone, timedelta
+
+from app.shared.config import get_settings
+from app.shared.database import get_db, init_schema
+from app.cron.daily_summary import generate_daily_summary
+from app.cron.cluster_unknowns import cluster_unknown_speakers
+from app.cron.purge_clips import purge_old_clips
+
+
+def run_nightly(settings, db):
+    yesterday = (datetime.now(timezone.utc) - timedelta(days=1)).strftime("%Y-%m-%d")
+    today = datetime.now(timezone.utc).strftime("%Y-%m-%d")
+    generate_daily_summary(yesterday, settings, db)
+    cluster_unknown_speakers(settings, db)
+    purge_old_clips(today, settings, db)
+
+
+def main():
+    settings = get_settings()
+    init_schema(settings)
+    db = get_db(settings)
+
+    while True:
+        now = datetime.now(timezone.utc)
+        next_midnight = now.replace(hour=0, minute=0, second=0, microsecond=0)
+        if next_midnight <= now:
+            next_midnight += timedelta(days=1)
+        sleep_secs = (next_midnight - now).total_seconds()
+        time.sleep(sleep_secs)
+        run_nightly(settings, db)
+
+
+if __name__ == "__main__":
+    main()