Fix: add created at to environment type trends (#6437)

Add created_at to environment_type_trends table for easy sorting

---------

Signed-off-by: andreas-unleash <andreas@getunleash.ai>

src/migrations/20240305121426-add-created-at-environment-type-trends.js

@@ -0,0 +1,15 @@
+'use strict';
+
+exports.up = function(db, cb) {
+    db.runSql(
+        `
+        ALTER TABLE IF EXISTS environment_type_trends
+            ADD COLUMN created_at timestamp default now();
+        `,
+        cb,
+    );
+};
+
+exports.down = function(db, cb) {
+    db.runSql('ALTER TABLE IF EXISTS environment_type_trends DROP COLUMN IF EXISTS created_at;', cb);
+};