CommandError: Database C:\Users\Administrator\PycharmProjects\MedManager\db.sqlite3 couldn't be flushed. Possible reasons:

There are several possible reasons why you might be seeing this error message. Here are some of the most common ones:

1. The database file is locked by another process: This can happen if another program or service is using the database file at the same time as your application. Try closing any other programs that might be accessing the database and then try again.

2. The database file is read-only: If the file has been set to read-only mode, your application won't be able to write to it. Check the file properties to make sure it's not read-only.

3. The database schema has changed: If you've made changes to the database schema (e.g. adding or removing tables or fields), you may need to update your application code to reflect those changes.

4. There are integrity constraints that are being violated: If your application is trying to insert or update data that violates a constraint (e.g. a unique key or foreign key constraint), you may need to fix the data or adjust the constraints to allow the data to be inserted.

To troubleshoot the issue, you can try the following steps:

1. Make sure that the database file exists and is accessible.

2. Check if any other program or service is using the database file.

3. Make sure that the database file is not read-only.

4. Check if there are any integrity constraints that are being violated.

5. If none of the above steps work, you may need to try rebuilding the database from scratch.