Alternate approaches I considered:

1. I spent 5min Googling and asking ChatGPT to see if I could access SQLite's internal JSON parsing library directly, but had no luck
2. I considered including this in the original getMessageSQL, but all the options had some downsides:
   • We could query for it in getAllMessages too, but that seemed wasteful
   • We could try to match up the JSON-parsed field to the messages vector in a second pass after calling processMessagesResults, but that felt messy and seemed to defeat the purpose of factoring out the first pass
   • We could try to hack processMessagesResults so it passed extraneous data through into some miscellaneous field of MessageEntity, but that seemed messy too
3. I looked into using folly::parseJson, but we'd have to add it to our WASM on web, which would bloat our bundle size
4. I considered parsing the JSON with RegExp, but didn't love that idea