As part of the ActiveWarehouse project we've broken out extensions to the ActiveRecord adapters into its own subproject called AdapterExtensions. This project is specifically for extensions to the adapters themselves versus extensions to ActiveRecord::Base and its related classes. If you have extensions at the adapter level and do not yet have a permanent home for them then please feel free to contact me and we can work on integrating those changes into the AdapterExtensions project.
Right now we support two extensions, truncate and bulk load (using native database tools) for MySQL, PostgreSQL and SQL Server.
More information can be found here:
Note that the AdapterExtensions package is not dependent on ActiveWarehouse code in any fashion, rather AW is dependent on AdapterExtensions.
Questions and comments are encouraged, as always.
V/r Anthony Eden