CREATE TABLE IF NOT EXISTS events (
  event_id INTEGER PRIMARY KEY AUTOINCREMENT,
  run_id TEXT NOT NULL,
  task_id TEXT NOT NULL,
  thread_id TEXT,
  source TEXT NOT NULL,
  event_type TEXT NOT NULL,
  message_id TEXT,
  summary TEXT NOT NULL DEFAULT '',
  payload_json TEXT NOT NULL DEFAULT '{}',
  created_at TEXT NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_events_run_event
  ON events(run_id, event_id);

CREATE INDEX IF NOT EXISTS idx_events_thread_event
  ON events(thread_id, event_id);