feat: Change request rejections db table (#4486)

src/migrations/20230814095253-change-request-rejections.js

@@ -0,0 +1,25 @@
+'use strict';
+
+exports.up = function (db, callback) {
+    db.runSql(
+        `
+            CREATE TABLE IF NOT EXISTS change_request_rejections (
+               id SERIAL PRIMARY KEY,
+               change_request_id INTEGER NOT NULL REFERENCES change_requests(id) ON DELETE CASCADE,
+               created_by INTEGER NOT NULL REFERENCES users (id) ON DELETE CASCADE,
+               created_at TIMESTAMP DEFAULT now(),
+               UNIQUE (change_request_id, created_by)
+            );
+        `,
+        callback,
+    );
+};
+
+exports.down = function (db, callback) {
+    db.runSql(
+        `
+            DROP TABLE IF EXISTS change_request_rejections;
+        `,
+        callback,
+    );
+};