chore: purge checks older than 30 days

app/cleanup.py

@@ -0,0 +1,42 @@
+"""Remove Arena check records older than the retention window."""
+from __future__ import annotations
+
+import os
+import sqlite3
+import sys
+import time
+from datetime import datetime, timedelta, timezone
+
+DB_PATH = os.environ.get("DB_PATH", "/data/arena.db")
+RETENTION_DAYS = int(os.environ.get("CHECK_RETENTION_DAYS", "30"))
+
+
+def cleanup(db_path: str = DB_PATH, retention_days: int = RETENTION_DAYS) -> int:
+    if retention_days < 1:
+        raise ValueError("CHECK_RETENTION_DAYS must be >= 1")
+    cutoff = (datetime.now(timezone.utc) - timedelta(days=retention_days)).isoformat()
+    db = sqlite3.connect(db_path, timeout=30)
+    try:
+        db.execute("PRAGMA busy_timeout=30000")
+        before = db.total_changes
+        db.execute("BEGIN IMMEDIATE")
+        db.execute("DELETE FROM checks WHERE checked_at < ?", (cutoff,))
+        removed = db.total_changes - before
+        db.commit()
+        # Keep the persistent WAL bounded without a full VACUUM/long lock.
+        db.execute("PRAGMA wal_checkpoint(PASSIVE)")
+        print(f"[cleanup] removed={removed} cutoff={cutoff} retention_days={retention_days}")
+        return removed
+    except Exception:
+        db.rollback()
+        raise
+    finally:
+        db.close()
+
+
+if __name__ == "__main__":
+    try:
+        cleanup()
+    except Exception as exc:
+        print(f"[cleanup] ERROR: {exc}", file=sys.stderr)
+        raise

entrypoint.sh

@@ -17,6 +17,7 @@ umask 077
 
 cat <<EOF | crontab -
 0 */$INTERVAL * * * set -a; . $CRON_ENV; set +a; /usr/local/bin/python3 /app/app/probe.py >> /proc/1/fd/1 2>&1
+15 3 * * * set -a; . $CRON_ENV; set +a; /usr/local/bin/python3 /app/app/cleanup.py >> /proc/1/fd/1 2>&1
 EOF
 cron