Nice work! In my experience adding (basic) support for indexes shouldn't be too hard [0].

And good choice to support transactions up front. Adding that in later is pretty challenging.

Mine doesn't support transactions and refactoring to support it would take a while. :(

If HN-ers are interested in more database Internals content check out /r/databasedevelopment too.

[0] https://notes.eatonphil.com/database-basics-indexes.html