mysql user warning: Can't generate a unique log-filename
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This error may happen when the MySQL server cannot create a new binary file, either because there is no space left in the device, or because you have moved or manipulated the binary logs in violation of the proper procedure. Check https://linux.overshoot.tv/wiki/mysql_binary_logs_administration for more information on mysql binary log administration. (You may edit this page to provide more accurate information on what precisely lead to the given error)