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### Summary The fix turns a negative timeout into a finite 60 second wait inside `MysqlDatabaseLock`, which both servers accept. Callers keep expressing "block until available", and the equivalent PostgreSQL and GaussDB work on the same `-1` semantics (#16346, #18506) is untouched. Non-negative timeouts keep their current behaviour. --------- Co-authored-by: Krim <git@krim.dev>