Support non-uuid ids (integer ids, especially)

[championswimmer]

Allow using integer autoincrement ids, like most SQL databases prefer.

Right now a bit of monkey patching around a handler as said (on #320 and #259 ) can help us with this, but it isn't fully supporting GraphQL. (Validations fail, searches fail).

[paparomeo]

@championswimmer: I'm willing to merge #320 if we add some test coverage to it.

[pmcnr-hx]

Can we close this now that #320 has been merged @championswimmer?