One Go interface, five backends — filelock, flock, Redis, Postgres, etcd. Distributed locks with fencing tokens, semaphore mode, observability hooks, and TraceID propagation. Swap backends with one line.

PostgreSQL-backed execution coordination primitive for correctness-sensitive distributed work.

Crash-safe distributed job execution with fencing tokens, lease recovery and deterministic failure validation.

Interactive simulator for worker lease expiry, zombie commits, ownership checks, and fencing tokens.

Redis-backed idempotency and fenced locks for background jobs.