This partially reverts #1257 / #1272 / 553531711b where the 404 was introduced.
A 406 error is still returned when requesting a single object via accept header.
Returning an error when no rows are changed can be introduced through a different syntax again, see the discussion in #2164.
Fixes#2343
Signed-off-by: Wolfgang Walther <walther@technowledgy.de>
This required untangling logic from App.hs.
Building/rejecting a plan no longer consumes a pool connection.
* Added io test for failed resource embedding not consuming connection
* optionalrollback to Query.hs and Response.hs
* delete Middleware module
* remove plan logic from App.hs
* remove RequestContext
* remove pkCols logic from App.hs
* remove proc logic from App.hs
* remove config logic from handleRequest
