ActiveRecord validations ignore SQLite3 timeout configuration

Hey all,

Sorry if this is not the right place, but I could not find anywhere
more appropriate. I ran into http://dev.rubyonrails.org/ticket/8811
over the past few days, and it's a very nasty bug. The fact is,
validates_uniqueness_of and validates_existence_of (at least) do not
respect the SQLite3 timeout database configuration, and cause SQLite
Database Busy exceptions.

The bug was moved to low priority two years ago, but I don't see how
this is low priority. We have background threads with SQLite
connections, so the validations must respect the timeout policy.
Otherwise the system randomly blows up when trying to create new model
instances (since that will trigger validations). It's not that the
threats truly horde the database, they are quick running tasks. It's
just that a single collision will cause an exception due to the
validations not respecting the timeout policy.

At present we are forced to re-write those validations in a safe way.

Thoughts? Thanks for any advice or consideration.
http://dev.rubyonrails.org/ticket/8811

-Evan Worley