Hey Arnold,
we do not have a tool that simply logs all deletions of all records in the application. The approach would be to add the creation of an application log manually for each record type that you are interested in.
I would suggest adding a custom logging process to the “Before delete” data process of the record that you want to monitor.
This way, right before a record is being deleted, the user, the ID and the timestamp are being tracked.
Your request suggests that you might have issues with records that are being deleted, or maybe not fully deleted.
If you struggle to also delete “underlying” records when deleting top level records, then you should consume the process “TMP_Delete records helper” and use it instead of the “Delete” action in the architect.
If records are deleted even if it should not be the case, you can add delete rules to prevent that.
Let me know if that helps or if you want to know more.