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Under some very particular circumstances, the "database is locked" error can still happen, even in WAL mode, even if the database connection is not being upgraded from a read transaction to a write transaction. We *think* this might be the reason behind errors like github.com/element-hq/element-x-ios/issues/3582, so we're enabling the sqlite busy_timeout, which will retry the operation after a short sleep, until the busy timeout is being hit.
The file is empty.