Versioning active database files is a very bad idea. If you want to use Git (or any other versioning system) to store past versions of your database, you should do so with database backup/dump files (.sql), not the actual database files themselves.
If you do not actually want to version these files, but they are located in your working copy, you should be able to right click > ignore them in SourceTree.
The main problem is that the files you are currently versioning represent part of a specific runtime state of your database. They depend on matching states in other parts of the system, such as other files (which you may also be versioning), but also potentially system data that could be stored in the registry or elsewhere.
Secondly (as you've discovered), storing binary database files completely prevents you from being able to preview or diff the files in/between revisions. If a commit message is missing or unclear, it is anybody's guess what changes have actually been made.
Supported Platforms macOS Sourcetree has a lot to offer and, like many developer tools, finding and using it all can be a challenge, especially for a new user. Everyone might not love ...
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