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f05eea19e5
fix: remove parent_id default '0' from product_category model - Root nodes should have parent_id=NULL, not '0' - Tree query already checks 'parent_id IS NULL' - Revert direct edits to generated dspy files
f13651e830
fix: product_category tree root node query + parent_id normalization - get_product_category: accept NULL/empty/'0' as root (parent_id IS NULL OR '' OR '0') - new_product_category: normalize empty/0 parent_id to NULL