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Warm schema metadata before the workers start and use a GVL-releasing busy handler for Rails 7.2 SQLite connections. Restore the configured timeout after each worker finishes.
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Concurrent
unless_existwrites to a missing key can all succeed, and concurrent increments can lose updates becauseSELECT ... FOR UPDATEhas no row to lock.Insert a placeholder before locking and reading the entry. Keep it within the transaction, replace it on write, and remove it when the block returns no value. A zero byte size distinguishes placeholders from valid empty values.