This test was failing due to missing a column in the model. We fix it by
resetting the cache after adding the column.

Signed-off-by: Ulysse Buonomo <[email protected]>

This test was failing due to missing a column in the model. We fix it by
resetting the cache after adding the column.

Signed-off-by: Ulysse Buonomo <[email protected]>

It was using old and invalid SQL statements. I took that
opportunity to also change a bit its behaviour:
- Remove the related rake task and automatically cache
  the schema if non-existent.
- Cache every databases used in tests.
- Ensure that cache name is based on schema files.

Rails is moving towards ractor compatibility, and to
do so it swapped to frozen database objects. Hence
we cannot simply memoize the factories anymore. I've
checked the initialization speed for factories, and
the memoization was too fast for it to be worth
implementing a cache.

See rails/rails@d2da816
See rails/rails@76448a0