* chore: add /v2 to import module path
go mod requires semantic versioning with versions greater than 1.x
This was a mechanical update by running:
```
go install github.com/marwan-at-work/mod/cmd/mod@latest
mod upgrade
```
Migrate generated files to import /v2
* Fix gen
* test: Use a template to prevent migrations from running for every test
* Create a single makefile target
* Fix built-in race
* Extend timeout of built-in PostgreSQL fetch