Instead of returning an error when getting the sqlc queries object, just
panic. This'll make the calling code quite a bit simpler. The situation
in which it might error out is so rare that I've never seen it, and I
don't even know if it will ever be possible to happen with the SQLite
implementation we use now. Furthermore, once we get rid of GORM, it
should just always work anyway.
Ref: #104305
Convert 'last-rendered' to sqlc. The query is slightly suboptimal.
There's a bug in sqlc: the `ON CONFLICT DO UPDATE` clause is generated
incorrectly. See https://github.com/sqlc-dev/sqlc/issues/3334 for more
info.
Add a "Last Rendered" view to the webapp.
The Manager now stores (in the database) which job was the last
recipient of a rendered image, and serves that to the appropriate
OpenAPI endpoint.
A new SocketIO subscription + accompanying room makes it possible for
the web interface to receive all rendered images (if they survive the
queue, which discards images when it gets too full).
