diff --git a/03_source/cms_backend/package.json b/03_source/cms_backend/package.json
index da4f2b0..4c000c4 100644
--- a/03_source/cms_backend/package.json
+++ b/03_source/cms_backend/package.json
@@ -28,7 +28,8 @@
     "db:generate": "prisma generate",
     "db:push": "prisma db push --force-reset",
     "db:push:w": "npx nodemon --delay 1 --watch prisma --ext \"ts,tsx,prisma\" --exec \"yarn db:push && yarn seed\"",
-    "db:studio": "prisma studio"
+    "db:studio": "prisma studio",
+    "db:studio:w": "npx nodemon --delay 1 --watch prisma --ext \"prisma\" --exec \"yarn db:studio\""
   },
   "engines": {
     "node": ">=20"
diff --git a/03_source/cms_backend/src/constants.ts b/03_source/cms_backend/src/constants.ts
new file mode 100644
index 0000000..960876f
--- /dev/null
+++ b/03_source/cms_backend/src/constants.ts
@@ -0,0 +1,7 @@
+const L_ERROR = 0;
+const L_WARN = 1;
+const L_INFO = 2;
+const L_DEBUG = 3;
+const L_TRACE = 4;
+
+export { L_WARN, L_INFO, L_ERROR, L_DEBUG, L_TRACE };
diff --git a/03_source/cms_backend/src/utils/jwt.ts b/03_source/cms_backend/src/utils/jwt.ts
index 3d9da07..8deb44f 100644
--- a/03_source/cms_backend/src/utils/jwt.ts
+++ b/03_source/cms_backend/src/utils/jwt.ts
@@ -12,11 +12,7 @@ type Token = {
  * SignJWT
  * https://github.com/panva/jose/blob/main/docs/classes/jwt_sign.SignJWT.md
  */
-export async function sign(
-  payload: Token,
-  secret: string,
-  options: { expiresIn: string | number }
-): Promise<string> {
+export async function sign(payload: Token, secret: string, options: { expiresIn: string | number }): Promise<string> {
   const iat = Math.floor(Date.now() / 1000);
 
   return new SignJWT({ ...payload })