- Fixed issue where a primary key column that has a Sequence on it,
yet the column is not the "auto increment" column, either because
it has a foreign key constraint or ``autoincrement=False`` set,
would attempt to fire the Sequence on INSERT for backends that don't
support sequences, when presented with an INSERT missing the primary
key value.  This would take place on non-sequence backends like
SQLite, MySQL. [ticket:2896]