Supervises all processes for a single Fact database instance. 🏛️

Fact.DatabaseSupervisor is the top-level supervisor for a database, responsible for:

• Registering the database in Fact.Registry
• Supervising per-database registries and PubSub
• Starting core database processes:
  • Fact.EventPublisher – broadcasts new events to subscribers
  • Fact.Database – handles indexing, reads, and writes
  • Fact.EventLedger – manages ledger commits and event ordering
  • Indexers (Fact.EventStreamIndexer, Fact.EventTagsIndexer, Fact.EventTypeIndexer, etc.)
• Supervising a dynamic supervisor for stream writers (Fact.EventStreamWriterSupervisor)

Each child process is registered under a database-specific name via Fact.Registry, ensuring isolation between multiple database instances.

This supervisor is automatically started by Fact.Supervisor when a database is initialized, and consumers typically interact with the database through higher-level APIs rather than directly starting this supervisor.