[Host.Outbox.PostgreSql] Outbox provider for PostgreSql

[EtherZa]

A Host.Outbox.PostgreSql[.DbContext] implementation of the Host.Outbox.Sql[.DbContext] provider for use with PostgreSQL.

Outbox message by reference

• Reverted uuidv7: [Host.Outrbox] added HasId abstraction #325 HasId interface in favour of using object references to abstract the provider implementation from the OutboxSendingTask. This has been bundled as its own commit in the PR for traceability/review.

#392 Host.Outbox.PostgreSql

• Added SlimMessageBus.Host.Outbox.PostgreSql and SlimMessageBus.Host.Outbox.PostgreSql.DbContext as flavours of the Sql Server implementations
• Updated Sample.OutboxWebApi to select the target provider via enum selection
• Updated documentation to include references to both implementations
• Refactored SqlOutboxTemplate and its consumers to use an interface instead of a direct reference to the class

-sorry, this is a fairly chunky submission

[zarusz]

@EtherZa As always — fantastic contribution and solid direction!

When you get a chance, could you take a quick look at the SonarCloud warnings? Some of them might be false positives, but a quick review could help fine-tune things.

I'll be doing a more in-depth review over the next few days.

Thanks again for your great work!

[EtherZa]

I've gone through the SonarCloud complaints and resolved most of them while hiding the SQL injection concern.

The outbox table/schema names are being injected into the migration scripts, which does pose a potential injection point, but as it would need to be manipulated by the same audience that uses it, I feel that the concern becomes moot (SQL Server migration has a similar implementation).

Code duplication is due to "copying" code from the SQL outbox implementation. I looked at abstracting this into a common library, but the SQL transport stub makes it a little scrappy. I chose to rather "reinvent the wheel" in the PostgreSql libs to keep the code together with minor tweaks where required.

[zarusz]

@EtherZa looks good!

Do you want to update the top level README.md with the plugin reference (in the table), and add a Postgre outbox call out in the README.md meant for NuGet packages? I could also add that here myself.

[EtherZa]

Thanks @zarusz. I have made the two changes and updated the README.md. Please let me know if there is anything else you would like tweaked, otherwise it's good to go from my end.

[sonarqubecloud]

Quality Gate failed

Failed conditions
3.8% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud