Investigate if we can delete unused relationship tables

[mitchdowney]

When I inspect these tables in the database, I see 0 rows. I don't why or when these tables were created.

episodes_authors_authors
episodes_categories_categories
media_refs_authors_authors
media_refs_categories_categories

[suorcd]

@mitchdowney these are still empty. Can I drop them?

[mitchdowney]

@suorcd I think so but I will make sure the API still works if I drop them in the stage environment.

[mitchdowney]

@suorcd on second thought, there is a bit of code in the API where we could use these tables, but I'm just not using them right now. I'm thinking of just keeping these 4 tables for now even though they're empty.