Remove uniqkey field from every model. This field is redundant data. Every Django database model has a built-in id which is unique for that database entity. So this field becomes redundant. In addition this field is not even a primary key. So I am not sure what it is trying to achieve. It is also agains the schema design principles. Normalization level 2 is lost by having redundant data. The way uniqkey is generated using random is also awkward.

Add pytask as prefix to admin media and move SITE_ID to local settings