Why did my app stop launching?

Question

SQLite

I created a directory on WPF DataGrid using a SQLite database, it would seem that there are no problems, the application is launched, edited, but after I started filling the directory with data, after I closed it, it stopped opening, now I don’t know what the problem is? How to optimize the application? To make it work correctly with any amount of data? Thank you. I tried to delete the entered data through DbBrowser and the application started, but it stops working if there is a lot of data.