Valkey 9.1 adds database-level ACLs, Lua modularization, and higher throughput

Valkey 9.1 provides database-level access controls, enabling more granular user permissions for multi-tenant setups.

The release moves Lua scripting to a separate module, reducing security exposure and allowing operators to disable it if not required.

Performance enhancements include a redesigned I/O threading model that delivers up to 17% increased throughput, faster stream and sorted set operations, and lower memory usage for small strings and sorted sets.