Task: Purge n8n execution history located in Mysql

n8n workflow JSON:
{"id":"60","name":"n8n_mysql_purge_history_greater_than_10_days","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"MySQL","type":"n8n-nodes-base.mySql","position":[450,300],"parameters":{"query":"DELETE FROM execution_entity \nWHERE DATE(stoppedAt) < DATE_SUB(CURDATE(), INTERVAL 30 DAY)","operation":"executeQuery"},"credentials":{"mySql":"n8n"},"typeVersion":1},{"name":"Cron","type":"n8n-nodes-base.cron","position":[250,460],"parameters":{"triggerTimes":{"item":[{"hour":7}]}},"typeVersion":1}],"active":true,"settings":{},"connections":{"Cron":{"main":[[{"node":"MySQL","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"MySQL","type":"main","index":0}]]}}}