Project help!

HI so for a college computer science project I am building a database management system, for a made-up company where you can keep a record of transactions, you can edit the transaction update them delete them and etc, however the project is not complex enough, So i need help in having ideas to make it more complex, any ideas would be helpful thanks! , I have already made a login system where the staff have a login system and can only access there own transactions and edit them. If you can suggest from these it would also be helpful, as this is what I have to implement into my project. Thanks in advance! https://imgur.com/JdeteOI https://imgur.com/Mcp48tK