added constraint cr_items_parent_id_ck to avoid certain simple loops on parent_ids
An item must not be equal to its own parent. Note that …
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added constraint cr_items_parent_id_ck to avoid certain simple loops on parent_idsAn item must not be equal to its own parent. Note that this constraint is notguaranteed to avoid all loops; it is still possible to create indirect recursiveloops but excludes some real-world problems.
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