ensureDbCompatibility ran ALTER TABLE / CREATE TABLE IF NOT EXISTS on the
login, register, token and session paths, mirroring columns every
migration under prisma/migrations already creates. The entrypoint applies
those migrations before the server listens and stops the boot when one
fails, so the mirror never had work to do, and DDL on a request path
needs the table's owner: a connection that may only read and write rows
fails every login on it. Drop the module, its call sites and the mocks
that stubbed it out.
A find-then-delete pair let two deletes of the same conversation both
find the row, and the slower one failed with a 500. A client that
re-sends a delete it could not confirm now gets 404 for the second
request, which it reads as already gone.
The integration test covers the thread, its messages and its document
links going with it, the document itself staying, the list no longer
carrying it, a foreign account getting 404, and the concurrent pair.
Marc-André Bombeck