matrix-spec-proposals/event-schemas/schema/m.direct

{
  "type": "object",
  "title": "Direct Message Map Event",
  "description": "Account Data event used to store which rooms are 'direct chats' for which users.",
  "allOf": [{
    "$ref": "core-event-schema/event.yaml"
  }],
  "properties": {
    "type": {
      "type": "string",
      "enum": ["m.direct"]
    },
    "content": {
      "type": "object",
      "description": "Object mapping user IDs to lists of room IDs.",
      "additionalProperties": {
        "title": "User ID",
        "type": "array"
      }
    }
  },
  "required": ["type", "content"]
}