Google Firebase Cloud Messaging in service of letting you know about new postings on Gumtree (to be enhanced). Also, Android app receiver of notifications is not here yet.
- Send updates when someone new tracks?
- Others can ignore.
- Remove stale updates.
- Better error handling - e.g. UniqueViolation upon 2nd tracking request.
- Cleanup (and correct - Config especially) the tests!
- Plenty of 'unit' tests are actually integration tests (using DB)...