Did some testing of a previous version of this migration and things worked as expected. That said, made some tweaks (eg using `.map` instead of for loop, etc) so will go through and test things again.
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Will be tested with:
- Safari
- Chrome
- Firefox
**Scenario 1: Migration against thread store with all `ClientDBThreadInfo`s currently minimally encoded should be noop**
1. Log into current `web` client (on `master`).
2. Log the value of `stores.store.threads` at start of migration 11.
3. Create a temporary migration 12 and log the value of `stores.store.threads`.
4. Make sure that the values of `stores.store.threads` are identical before and after.