Before db_metrics were all or nothing. Now `InTx` metrics are always recorded, and query metrics are opt in.
Adds instrumentation & logging around serialization failures in the database.
* 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
