PouchDB read optimisation - reducing time of data queries

Recent ARC version has so called API assistant. It's a helper program which queries history data for relevant information when the URL or HTTP method changed. It reads history of requests made to particular method (meaning endpoint and method) and analyse the statistics data about this method like connection time or response size.

Recently I was asked how it will behave when the app stores a lot of data. I mean hundreds of thousands of records. Then it occurred to me that I haven't performed test for this amount of data. It started a series of changes in the code of the assistant which finally allowed me to shorten database query time by 98.52%!