I’m having trouble connecting my Discord bot to the MySQL database hosted on Railway. In the Railway dashboard, under the MySQL service, the "Database Connection" section is stuck on loading and never completes.

I have correctly set the environment variables (MYSQLHOST, MYSQLUSER, MYSQLPASSWORD, MYSQLDATABASE) based on the provided info. However, my application returns the error: mysql.connector.errors.ProgrammingError: 1046 (3D000): No database selected

This suggests that the database connection is not fully established or the database is not selected properly.
Also, any advice on how to fix the "Database Connection" loading issue would be greatly appreciated.