Replace mutation-lock with document-lock to centralize document mutation serialization and database transaction management. Introduce runInDbTransaction utility to abstract SQLite/Postgres transaction differences. Update document deletion, user data cleanup, and rate limiter logic to delegate transaction handling and locking to shared helpers. Remove dialect-specific branching and inline transaction logic for improved maintainability and testability. BREAKING CHANGE: withDocumentMutationLock is removed in favor of withDocumentLock and runInDbTransaction |
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