Mica is a single integrated system combining a programming language, runtime, and persistent database designed around declarative facts, rules, and role-based method dispatch. Instead of splitting state across a database, application code, and background jobs, you define objects as durable identities annotated with relations (facts), Datalog-like rules for derived relations, and verbs (methods) that dispatch based on role restrictions rather than receiver objects. The persistence model uses snapshot-isolated transactions; the execution model supports live editing of world logic while the system runs. Current implementation includes a Cranelift JIT, optional wgpu GPU acceleration for queries, and browser/telnet/HTTP surfaces. The author positions it for collaborative workspaces, simulations, agent environments, and MUDs—systems where shared queryable state and editable rules are central, not peripheral. The source shows a working browser MUD example and suggests the core architecture is functional, though marked pre-1.0.