HI ajja.im,
Thank you for using our plugin. There are several ways how you can delete all the audit log entries.
First method:
1. From the plugin settings page set the security alerts pruning option to keep up to 1 alert.
2. Click on Run manually option
3. Once all the audit log is flushed except from 1 entry that notifies you of the pruning, you can reconfigure the alerts pruning options as you like.
Second method:
1. Access your WordPress database using phpMyAdmin or something similar.
2. Clear all rows in the following tables:
2.a. wp_wsal_metadata
2.b. wp_wsal_occurrences
Third method:
The third option is to contact us and we will give you a file which you can use to run a query through the plugin.
I think the first method is the most straight forward and easiest one so try that and let me know should you have any further queries.