Does anyone have recommendations on a constant DB optimized for sequential integer keys? Running LZ4 over things is cool, but using delta encoding or more cleve

Does anyone have recommendations on a constant DB optimized for sequential integer keys? Running LZ4 over things is cool, but using delta encoding or more clever schemes, you can work right on the compressed key data. (And even more fun if the value is also just a restricted set of integers, like an inverted index.)