Redka: Redis re-implemented with SQL

Redka is a Redis-compatible server and Go module that reimplements Redis functionality using SQL databases (SQLite or PostgreSQL) as the backend. It supports five core Redis data types (strings, lists, sets, sorted sets, hashes) and offers both standalone server and embedded library usage. While not matching Redis performance, Redka handles tens of thousands of operations per second and provides benefits like SQL introspection, embedded caching for Go apps, and simplified testing environments.