Looking at the Github, it really feels like you should organize your code better. There are many files with the same prefix that should go into their own src/{prefix} subdirectories. The README is really lackluster and should contain installation information and screenshots at least.

https://github.com/DirkJanJansen/Pandora/blob/master/invoerI... What the heck is this supposed to be? Are you really creating a database table and then a connection, and executing that in the middle of some random code? You really need to separate this out. And this is not a cherrypicked complaint, this is the first file I randomly clicked in the repo.

https://github.com/DirkJanJansen/Pandora/search?q=create_eng... This looks like you're creating a new engine anywhere you need database access. This is NOT how you use SQLAlchemy. Create a database.py file that contains a SINGLE create_engine function, and define all your tables in one place. This code looks like a real mess.

Don't take this as a personal attack. We all had to start somewhere. But this is not something I'd call top quality or really even quality.