We ended up finding ourselves with a bunch of tables that have mostly the same columns, but differ by a few. Every time we consume a REST API, we store the `access_token`s and expiration dates and the other OAuth data. However, each provider has slightly different requirements. For example, we store email addresses for email api's, other providers require us to store some additional information, etc. etc.. I'm tempted by the flexibility and lack of schema brought by document databases, but not enough to use one since they're generally slower and we already have everything in SQL. So I got the idea of using JSON columns to alleviate this issue: have a single table for all REST integrations (be it outlook or facebook), and then store the unique integration data inside of this JSON column for "additional data". This data is mostly just read, not filtered by (but ocasionally so). Has anyone had experience with this? How's the performance of JSON fields? Is this a good practice or will it get harder with more integrations?