{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "event-envelope-v1.json",
  "title": "Model Platform Event Envelope V1",
  "description": "MySQL Outbox 中所有内部业务事件共用的不可变信封。",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "event_id",
    "event_type",
    "schema_version",
    "occurred_at",
    "producer",
    "trace_id",
    "aggregate_type",
    "aggregate_id",
    "idempotency_key",
    "payload"
  ],
  "properties": {
    "event_id": {
      "$ref": "#/$defs/ulid"
    },
    "event_type": {
      "type": "string",
      "pattern": "^[a-z][a-z0-9]*(\\.[a-z][a-z0-9_]*)+$"
    },
    "schema_version": {
      "const": 1
    },
    "occurred_at": {
      "type": "string",
      "format": "date-time"
    },
    "producer": {
      "type": "string",
      "minLength": 1,
      "maxLength": 64
    },
    "trace_id": {
      "type": "string",
      "minLength": 1,
      "maxLength": 64
    },
    "aggregate_type": {
      "type": "string",
      "minLength": 1,
      "maxLength": 64
    },
    "aggregate_id": {
      "type": "string",
      "minLength": 1,
      "maxLength": 128
    },
    "idempotency_key": {
      "type": "string",
      "minLength": 8,
      "maxLength": 128
    },
    "payload": {
      "type": "object"
    }
  },
  "$defs": {
    "ulid": {
      "type": "string",
      "minLength": 26,
      "maxLength": 26,
      "pattern": "^[0-9A-HJKMNP-TV-Z]{26}$"
    }
  }
}