Revert purchase order

migrations/000081_enforce_raw_material_purchase_order_items.down.sql

@@ -0,0 +1,7 @@
+DROP TRIGGER IF EXISTS trigger_validate_purchase_order_item_raw_material ON purchase_order_items;
+DROP FUNCTION IF EXISTS validate_purchase_order_item_raw_material();
+
+ALTER TABLE purchase_order_items
+    ALTER COLUMN ingredient_id DROP NOT NULL,
+    ALTER COLUMN quantity DROP NOT NULL,
+    ALTER COLUMN unit_id DROP NOT NULL;

migrations/000081_enforce_raw_material_purchase_order_items.up.sql

@@ -0,0 +1,41 @@
+DO $$
+BEGIN
+    IF EXISTS (
+        SELECT 1
+        FROM purchase_order_items poi
+        JOIN purchase_categories pc ON pc.id = poi.purchase_category_id
+        WHERE pc.type <> 'raw_material'
+           OR poi.ingredient_id IS NULL
+           OR poi.quantity IS NULL
+           OR poi.unit_id IS NULL
+    ) THEN
+        RAISE EXCEPTION 'purchase_order_items contains non-raw-material or incomplete raw-material rows. Move expense rows to expenses and fill ingredient_id, quantity, and unit_id before running this migration.';
+    END IF;
+END $$;
+
+ALTER TABLE purchase_order_items
+    ALTER COLUMN ingredient_id SET NOT NULL,
+    ALTER COLUMN quantity SET NOT NULL,
+    ALTER COLUMN unit_id SET NOT NULL;
+
+CREATE OR REPLACE FUNCTION validate_purchase_order_item_raw_material()
+RETURNS TRIGGER AS $$
+BEGIN
+    IF NOT EXISTS (
+        SELECT 1
+        FROM purchase_categories pc
+        WHERE pc.id = NEW.purchase_category_id
+          AND pc.type = 'raw_material'
+    ) THEN
+        RAISE EXCEPTION 'purchase_order_items.purchase_category_id must reference a raw_material purchase category';
+    END IF;
+
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+DROP TRIGGER IF EXISTS trigger_validate_purchase_order_item_raw_material ON purchase_order_items;
+CREATE TRIGGER trigger_validate_purchase_order_item_raw_material
+    BEFORE INSERT OR UPDATE OF purchase_category_id ON purchase_order_items
+    FOR EACH ROW
+    EXECUTE FUNCTION validate_purchase_order_item_raw_material();