BooleanField in firebird versions minors to 3 which doesn't suport boolean data type, Its was emulated with a smallint field with a check constraint to alow values just 1 or 0 or NULL if field is NullBooleanField [1]
Since firebird 3 wih bool data type support the contraint is no requiered any more, therefore it is not necessary set the check contraint at table level.
[1] NullBooleanFields was marked as deprecated sice django 4
PS:
In firerbird 3.0.x there are a bug removing a field with check contraint. At least django generated boolean fields with check contraint fails with the message "no current record for fetch operation At trigger ..."
BooleanField in firebird versions minors to 3 which doesn't suport boolean data type, Its was emulated with a smallint field with a check constraint to alow values just 1 or 0 or NULL if field is NullBooleanField [1]
Since firebird 3 wih bool data type support the contraint is no requiered any more, therefore it is not necessary set the check contraint at table level.
[1] NullBooleanFields was marked as deprecated sice django 4
PS:
In firerbird 3.0.x there are a bug removing a field with check contraint. At least django generated boolean fields with check contraint fails with the message "no current record for fetch operation At trigger ..."