Fix
* fix: Reimplement JWTs and add reverse code to migration 0037 (2081)
* Revert &34;fix: Revert JWT tokens (2079)&34;
This reverts commit b069472e9886cce73fa26cfeba06151d60906c64.
* Add revert code to JWT migration
* Improve query in migration 0037 ([`44dcf3a`](https://github.com/ocadotechnology/codeforlife-portal/commit/44dcf3a1a038a840e068af9194ce647bb2293138))