Purge n8n execution history located in Mysql

This workflow is useful if you have lots of tasks running daily. MySQL node (or the database used to save data shown in n8n - could be Mongo, Postgres, ... -) remove old entries from executionentity table that contains the history of the executed workflows. If you have multiple tasks executed every minute, 1024 rows will be created every day (60 minutes x 24 hours) per every task. This will increase the table size fastly. SQL query deletes entries older than 30 days taking stoppedAt column as a reference for date calculations. You only have to setup Mysql connection properly and config cron to execute once per day in a low traffic hour, this way

Help me set up the n8n workflow "Purge n8n execution history located in Mysql" (https://n8n.io/workflows/700). It uses: MySQL. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.