Generalize dbm to support different SQL engines

[sr-gi]

Currently, SQLite is used as the sole SQL backend for the tower. However, the tower should allow having different SQL backends pickable during compilation.

Generalize the DBM so other backends can be added.

Further info: https://www.summerofbitcoin.org/project-ideas-details?recordId=recYp3MeVaI79Jocg

DISCLAIMER

This is a Summer Of Bitcoin (SOB) project. If you're considering tackling this but you are not part of SOB, please leave it until SOB is over. After that, feel free to jump in.

[SpoonBuoy]

I'm interested into working on this one as I've some experience in working with relational databases. Besides I'm also the part of SOB. It'd be great if you could point out some relevant resources that would help me in drafting my proposal asap.

[sr-gi]

Hi @SpoonBuoy, the main resources are the ones listed in the SoB proposal. If you have any particular question, feel free to reach out using Slack, some other applicants have been asking questions there so you may find some of them useful.