v0.50.0

Changed

• Breaking: Resumable steps can no longer be nested. Calls fail before running child callbacks, preventing unreachable resume points and rolled-back parent checkpoints from being saved again. PR #1534.
• Job deletion through Client.JobDelete, Client.JobDeleteMany, their Tx variants, and the job cleaner now goes through optional pilot hooks, so a pilot can take part in deletes as it already can in cancels and retries. Behavior with the standard pilot is unchanged. PR #1500.

Fixed

• Refresh a durable periodic job's saved row only after its next run time is loaded at startup or committed. When a startup write rolled back, keep-alive could revive an expired row, and the next leader enqueued every run since the row's old next run time. PR #1540.
• Fail retries that omit a saved cursor-only step, while preserving their checkpoints for recovery. Jobs with an existing step marker retain their behavior, including legacy stale cursor entries. PR #1534.
• Fixed SQLite metadata updates recursively merging nested objects and deleting keys set to JSON null. Updates now replace whole top-level values, matching Postgres and preventing completed resumable cursor steps from running again on later retries. PR #1533.
• Fixed resumable transactional checkpoints being saved again after rollback or a failed write, and first-step cursors being lost on error, snooze, or cooperative shutdown. After a successful checkpoint write, the caller's transaction owns that progress; rollback may replay earlier unpersisted steps. The Rust, JavaScript, and Java runtimes now share the applicable behavior, including preserving progress on snooze. PR #1521.
• Fixed AddWorkerSafely leaving a worker's primary kind and earlier aliases registered when a later kind alias conflicts with an existing registration. Failed registrations now leave the worker registry unchanged. PR #1440.
• Fixed the notifier retrying without backoff and flooding logs when the context passed to Client.Start reaches its deadline. PR #1495.
• Fixed JobSnooze accepting negative durations despite documenting that they panic. PR #1529.