toyDB Distributed SQL database in Rust, built from scratch as an educational project. Main features: Raft distributed consensus for linearizable state machine replication. ACID transactions with MVCC-based snapshot isolation. Pluggable storage engine with BitCask and in-memory backends. Iterator-based query engine with heuristic optimization and time-travel support. SQL interface including joins, aggregates, and transactions. I originally wrote toyDB in 2020 to learn more about database internal...