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is there any open source project you know that uses a relational database and doesn't have a good UI or doesn't have enough ways to explore the data stored in it?

Great UI, but not enough ways to explore!

Phpmyadmin was quite popular for lamp installations at some point, only way to ‘explore is through sql queries, which is hard for people new to this field.

digkam comes to my mind immediately. It has a database full of photo annotations (faces recognized in the picture, their locations, photo time, place). Unfortunately one has to dive into sqlite to extract this information.