DEFINE

Purpose

Register the schema for an event type. STORE payloads must conform to this schema.

Form

DEFINE <event_type:WORD> [ AS <version:NUMBER> ] FIELDS { "key_1": "type_1", ... }

Field pairs

• Keys can be STRING or WORD. The parser will quote WORD keys when converting to JSON.
• Values (types) can be:
  • STRING literals, for example: "int", "string", "string | null"
  • ARRAY of strings to define an enum, for example: ["pro", "basic"]
    • Enum variants are case-sensitive ("Pro" != "pro")
• Schema must be flat (no nested objects).

Examples

DEFINE order_created FIELDS { "order_id": "int", "status": "string" }

DEFINE review FIELDS { rating: "int", verified: "bool" }

DEFINE order_created AS 2 FIELDS { order_id: "int", status: "string", note: "string | null" }

DEFINE subscription FIELDS { plan: ["pro", "basic"] }

Typical validation errors raised during STORE

• No schema defined
• Missing field status in payload
• Field order_id is expected to be one of int, but got String
• Payload contains fields not defined in schema: invalid_field