{
  "name": "Conversation",
  "type": "object",
  "properties": {
    "participants": {
      "type": "array",
      "description": "Array of participant IDs/emails",
      "items": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string"
          },
          "name": {
            "type": "string"
          },
          "role": {
            "type": "string",
            "enum": [
              "client",
              "vendor",
              "staff",
              "admin"
            ]
          }
        }
      }
    },
    "conversation_type": {
      "type": "string",
      "enum": [
        "client-vendor",
        "staff-client",
        "staff-admin",
        "vendor-admin",
        "client-admin",
        "group-staff",
        "group-event-staff"
      ],
      "description": "Type of conversation"
    },
    "is_group": {
      "type": "boolean",
      "default": false,
      "description": "Whether this is a group conversation"
    },
    "group_name": {
      "type": "string",
      "description": "Name of the group (e.g., 'All Active Staff', 'Event #123 Team')"
    },
    "related_to": {
      "type": "string",
      "description": "ID of related entity (event_id, order_id, etc.)"
    },
    "related_type": {
      "type": "string",
      "enum": [
        "event",
        "staff",
        "business",
        "general"
      ],
      "description": "Type of related entity"
    },
    "subject": {
      "type": "string",
      "description": "Conversation subject/title"
    },
    "last_message": {
      "type": "string",
      "description": "Preview of last message"
    },
    "last_message_at": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp of last message"
    },
    "unread_count": {
      "type": "number",
      "default": 0,
      "description": "Number of unread messages"
    },
    "status": {
      "type": "string",
      "enum": [
        "active",
        "archived",
        "closed"
      ],
      "default": "active"
    }
  },
  "required": [
    "participants",
    "conversation_type"
  ]
}