Modify the backend code and solve bugs in my python Django application

It's a POC project.I have written the code you just need to modify it and remove some bugs . And do some revisions in webapp. The front-end is connected using Django MVP & the DB is postgresql. You do need fix the bugs. The project contain 2section , 1- Data entry (need some revisions), 2filters -(there are 3filters need to write a new logic for 1 filter, debug 2filter)
The project is in Python Django, Postgresql