diff --git a/backend/src/main/resources/db/migration/V85__v.1.10_add_num.sql b/backend/src/main/resources/db/migration/V85__v.1.10_add_num.sql
deleted file mode 100644
index f7d17d0569..0000000000
--- a/backend/src/main/resources/db/migration/V85__v.1.10_add_num.sql
+++ /dev/null
@@ -1,50 +0,0 @@
-alter table issues add num int null;
-
-DROP PROCEDURE IF EXISTS test_cursor;
-DELIMITER //
-CREATE PROCEDURE test_cursor()
-BEGIN
-    DECLARE projectId VARCHAR(64);
-    DECLARE issueId VARCHAR(64);
-    DECLARE num INT;
-    DECLARE done INT DEFAULT 0;
-    DECLARE cursor1 CURSOR FOR (SELECT DISTINCT project_id
-                                FROM issues
-                                WHERE num IS NULL);
-    DECLARE cursor2 CURSOR FOR (SELECT id
-                                FROM issues
-                                WHERE project_id = projectId
-                                ORDER BY create_time);
-
-    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
-    OPEN cursor1;
-    outer_loop:
-    LOOP
-        FETCH cursor1 INTO projectId;
-        IF done
-        THEN
-            LEAVE outer_loop;
-        END IF;
-        SET num = 100001;
-        OPEN cursor2;
-        inner_loop:
-        LOOP
-            FETCH cursor2 INTO issueId;
-            IF done
-            THEN
-                LEAVE inner_loop;
-            END IF;
-            UPDATE issues
-            SET num = num
-            WHERE id = issueId;
-            SET num = num + 1;
-        END LOOP;
-        SET done = 0;
-        CLOSE cursor2;
-    END LOOP;
-    CLOSE cursor1;
-END //
-DELIMITER ;
-
-CALL test_cursor();
-DROP PROCEDURE IF EXISTS test_cursor;
\ No newline at end of file