Thanks should call the proper CheckUser hooks so that when users use Thanks, it would be logged by CheckUser.
Note that Thanks logs are not in RecentChanges. But nor are AbuseFilter logs and they are included in CU logs, and are actually very useful.
==== Justification
Users that are blocked or are actively evading the project may still use Thanks to "silently" interact with other users. This can help us have more recent CU logs for them during this period of inactivity.
==== Considerations
Adding Thanks logs will make `cu_changes` table larger. We should get an estimate of by how much, considering that `cu_changes` is already pretty large for largest wikis (such as enwiki or wikidatawiki).
* For enwiki, there seems to be ~30000 thanks logs per month: https://quarry.wmflabs.org/query/44741
* For wikidatawiki, there seems to be ~2000 thanks logs per month: https://quarry.wmflabs.org/query/44742