DO NOT MERGE (WIP tag prevents merging)
This branch uses a string for the UID (instead of i64).
- This enables testing with the refactored iOS codebase until the new pod schema is complete.
- See https://gitlab.memri.io/memri/ios-app-wip-sqlite-version for the new iOS codebase including pod API tests (note that the UI is not yet implemented, this is currently only a test-suite)