{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://vibebase.me/contracts/events/0.1.0",
  "title": "MutationEvent",
  "type": "object",
  "additionalProperties": false,
  "required": ["actor", "resource", "at"],
  "properties": {
    "actor": {
      "type": "object",
      "additionalProperties": false,
      "required": ["subjectId", "kind"],
      "properties": {
        "subjectId": { "type": "string", "minLength": 1 },
        "kind": { "$ref": "https://vibebase.me/contracts/principal/0.1.0#/$defs/kind" }
      }
    },
    "resource": {
      "type": "object",
      "additionalProperties": false,
      "required": ["type", "id"],
      "properties": {
        "type": { "type": "string", "minLength": 1 },
        "id": { "type": "string", "minLength": 1 }
      }
    },
    "change": {
      "type": "object",
      "additionalProperties": false,
      "properties": { "before": {}, "after": {} }
    },
    "at": { "type": "string", "format": "date-time" },
    "changesetRef": { "type": "string" },
    "provenance": { "enum": ["human-intent", "observed-proposal"] }
  }
}