Support more postgres errors

[Ramblurr]

To help track what postgres errors would be good to add default exception handlers for I've created this ticket.

All postgres errors are here: https://www.postgresql.org/docs/current/errcodes-appendix.html

• 42703 | undefined_column - likely to encounter this when your model field name does not match the table column

... more soon ...

[kwrooijen]

likely to encounter this when your model field name does not match the table column

You mean the field namespace doesn't match the model key?

Edit: Maybe we should have a validation check to see if all fields' namespaces are the same as the model keyword? Which would raise a readable exception at registration.

[Ramblurr]

I mean when the model key e.g. "email" doesn't have a corresponding column "email" in the table.

In this case I added a field to my model but forgot to add it to the table in my migration.

Edit: and then the second time I encountered it was when I named a model key ":user/verified?" but the column name was only "verified" (missing the question mark).