If I were charged with this task I'd probably take an actual SQLite DB and write methods to parse data from text files, then process it within SQLite, and seria

If I were charged with this task I'd probably take an actual SQLite DB and write methods to parse data from text files, then process it within SQLite, and serialize it back to the text file when an API method is called or after each processing step. A fresh DB engine, fully re-implemented to match SQLite's API is insane unless you're a prodigy or have a sizable team and will come with numerous downsides. I can recommend https://github.com/WiseLibs/better-sqlite3 https://github.com/WiseLibs/better-sqlite3 and https://github.com/loveencounterflow/dbay https://github.com/loveencounterflow/dbay