add MySQL + PG down.sql

migrations/mysql/02129_payment_sort.down.sql

@@ -0,0 +1,17 @@
+SET @column_exists = (
+    SELECT COUNT(*)
+    FROM INFORMATION_SCHEMA.COLUMNS
+    WHERE TABLE_SCHEMA = DATABASE()
+      AND TABLE_NAME = 'payment'
+      AND COLUMN_NAME = 'sort'
+);
+
+SET @sql = IF(
+    @column_exists > 0,
+    'ALTER TABLE `payment` DROP COLUMN `sort`',
+    'SELECT 1'
+);
+
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;