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-- @tag: prices_unique
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-- @description: DB-Constraint - nur ein Preis pro Artikel pro Preisgruppe
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-- @depends: release_3_4_1
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-- it would be easier to just have a composite primary key on parts_id and
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-- pricegroup_id, but that would need some code refactoring
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ALTER TABLE prices ADD CONSTRAINT parts_id_pricegroup_id_unique UNIQUE (parts_id, pricegroup_id);
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ALTER TABLE prices ALTER COLUMN parts_id SET NOT NULL;
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ALTER TABLE prices ALTER COLUMN pricegroup_id SET NOT NULL;
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