Optimize DELETE statement for phase_area conditions

[mdX7]

Is your feature request related to a problem? Please describe.
When generating phase_area entry the output looks like the following sql query:

DELETE FROM `conditions` WHERE (`SourceTypeOrReferenceId` = 26) AND (`SourceEntry` IN (9042));
INSERT INTO `conditions` (`SourceTypeOrReferenceId`, `SourceGroup`, `SourceEntry`, `SourceId`, `ElseGroup`, `ConditionTypeOrReference`, `ConditionTarget`, `ConditionValue1`, `ConditionValue2`, `ConditionValue3`, `ConditionStringValue1`, `NegativeCondition`, `Comment`) VALUES 
(26, 12812, 9042, 0, 0, 9, 0, 54721, 0, 0, '', 1, 'Player doesn\'t have quest I\'m Too Old for This Ship (54721) active');

What happens here: We are deleting ALL phase conditions for Area/ZoneId 9042 here.

Describe the solution you'd like
DELETE by SourceTypeOrReferenceId AND SourceGroup AND SourceEntry