We have some sql that will remove enabled tag keys depending on the tags summary. We should consider the impact this code may have on the tag_mappings table. Now that the tag mapping tables is FK connected to the enabled tag keys. 

We discovered earlier this year that django's cascade delete functionality does not work as well using raw sql. Therefore, we may want to consider if the cascade delete for the tag mapping will fail with our remove_stale_enable_tags.sql