NodeJS Express with OracleDB

I'm having issues with one of my Nodejs backend software using Express + Oracledb. it suddenly stops responding but doesn't show any errors. When accessing the GET URL, it doesn't show anything or timeout. It can work for a couple of days and then stop working.

Main goals:
- Improve/clean the source code
- Detect and implement any best practices to prevent the software to hang

For any additional information do not hesitate to ask