Entity Stream Queries

Read packages/state/skills/stream-db/SKILL.md first for StreamDB and query basics.

Electric Agent Runtime Entity Stream Queries

Use direct typed queries against db.collections.*.

Principles:

• Prefer queryOnce(...) for one-shot reads and useLiveQuery(...) or shared live query collections for reactive UI.
• Do not add exported convenience read helpers for obvious queries. The query itself is already the API.
• Keep code helpers only for real invariants:
  • manifest key builders
  • typed event/write helpers
  • shared product-facing projections such as the entity timeline query
• In runtime, tests, examples, and CLI code, favor direct queries over raw toArray scans when the read is naturally query-shaped.
• Do not cast around db.collections.*. The row types come from the schema.

Read these references as needed:

• references/collections.md for the built-in entity collections and manifest row kinds
• references/common-queries.md for common query patterns

When writing to entity or shared-state streams, use the typed event helpers/server APIs. Do not hand-build stream event envelopes.