lol according to github 80 MB is not small - https://docs.github.com/en/repositories/working-with-files/m...

Git is designed for text files. An 80 MB text file is huge. An 80 MB binary database is tiny.

I depends what you are putting into it... I think it's completely feasible to get 100000 customer records into 80 MB... and then some

Git is a tool to diff code. Github host git repositories.

You are using Github to store data, not code.