sneak
239c8e3ff6
check / check (push) Failing after 2s
Batch flush paths read before they write, so a deferred transaction starts as a reader and must upgrade to the write lock on its first INSERT/UPDATE. When the background maintainer holds the write lock for a WAL checkpoint, that upgrade fails immediately with "database is locked" and the busy timeout does not apply, so the batch is dropped. Adding _txlock=immediate to the DSN makes every transaction take the write lock at BEGIN, so it waits up to busy_timeout instead of failing. A regression test drives batch writes against a running checkpoint loop and fails with "database is locked" without the change. Model: opus-4-8