Having recently been digging into the CDB format[1], this was exactly my first thought as well. `tinycdb` is extremely fast at creating an index, and most succe

Having recently been digging into the CDB format[1], this was exactly my first thought as well. `tinycdb` is extremely fast at creating an index, and most successful lookups take only two disk seeks (failed lookups need only one), very close to the optimal possible lookup performance on this problem. [1]: https://search.feep.dev/blog/post/2022-12-03-cdb-file-format https://search.feep.dev/blog/post/2022-12-03-cdb-file-format