@Maxime You can add the following to Admin > Databases > (your MySQL) > Connection String:
sessionVariables=max_execution_time=3000 - in milliseconds - change to higher number
For reference: https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_max_execution_time
MariaDB uses max_statement_time which is in seconds - https://mariadb.com/kb/en/server-system-variables/#max_statement_time
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