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## Why Command persistence duplicated NIP-33 replacement SQL in the relay and obscured the boundary between database runtime concerns and domain-store behavior. This proving slice establishes that boundary inside the existing `buzz-db` crate. ## What - Centralize parameterized-replaceable coordinate locking, ordering, replacement, watermark, and mention-indexing behavior in `buzz-db` - Expose transaction-required replacement and ordinary-insertion seams while keeping transaction ownership and workflow conflict messages in the relay - Cover concurrency, same-second ties, stale writes, replay, caller rollback, nested rollback recovery, and mention-index atomicity with focused PostgreSQL tests ## Risk Assessment Medium — this changes core event persistence and command idempotency paths, while intentionally preserving NIP-33, NIP-RS, mesh, and workflow conflict semantics. ## References - Architecture guardrail: https://github.com/TheSentinel454/buzz/issues/34 - Proving slice: https://github.com/TheSentinel454/buzz/issues/3, https://github.com/TheSentinel454/buzz/issues/4, https://github.com/TheSentinel454/buzz/issues/6 Generated with Codex --------- Signed-off-by: tornquist <tornquist@squareup.com>