bpm-storage

Persistence abstractions for the BPM engine. Defines async traits only; no concrete backend.

Role

• ProcessInstanceStore — load/save process instances, list running.
• ProcessDefinitionStore — load process definitions by id.
• TokenStore — load/save tokens by instance, claim (CAS), update.
• TimerStore — get by id, mark fired, insert, list due.
• ExternalTaskStore — create, fetch-and-lock, complete, fail, reclaim expired locks.
• Additional traits: ParallelJoinRepo, CompensationRecordRepo, OutboxRepo (event outbox).

Implementations live in adapter crates (e.g. bpm-adapter-memory).

Usage

Depend on this crate to implement a new persistence backend. The runtime and server depend on these traits.

Documentation

See docs/database-schema.md and docs/architecture.md.