-- Fix Lesson id sequence when it gets out of sync (e.g. after seed_schedule inserts with explicit ids).
-- Call this before bulk-inserting lessons so new rows get unique ids.

CREATE OR REPLACE FUNCTION sync_lesson_id_sequence()
RETURNS void
LANGUAGE plpgsql
SECURITY DEFINER
SET search_path = public
AS $$
BEGIN
  PERFORM setval(
    pg_get_serial_sequence('"Lesson"', 'id'),
    COALESCE((SELECT MAX(id) FROM "Lesson"), 1)
  );
END;
$$;

COMMENT ON FUNCTION sync_lesson_id_sequence() IS 'Sets Lesson id sequence to max(id)+1 so next inserts do not violate Lesson_pkey.';

-- Allow authenticated users to call (needed for generate-lessons actions)
GRANT EXECUTE ON FUNCTION sync_lesson_id_sequence() TO authenticated;
GRANT EXECUTE ON FUNCTION sync_lesson_id_sequence() TO service_role;