{
  "name": "Message",
  "type": "object",
  "properties": {
    "conversation_id": {
      "type": "string",
      "description": "ID of the conversation"
    },
    "sender_id": {
      "type": "string",
      "description": "ID of the sender"
    },
    "sender_name": {
      "type": "string",
      "description": "Name of the sender"
    },
    "sender_role": {
      "type": "string",
      "enum": [
        "client",
        "vendor",
        "staff",
        "admin"
      ],
      "description": "Role of the sender"
    },
    "content": {
      "type": "string",
      "description": "Message content"
    },
    "read_by": {
      "type": "array",
      "description": "Array of user IDs who have read the message",
      "items": {
        "type": "string"
      }
    },
    "attachments": {
      "type": "array",
      "description": "Attached files",
      "items": {
        "type": "object",
        "properties": {
          "url": {
            "type": "string"
          },
          "name": {
            "type": "string"
          },
          "type": {
            "type": "string"
          }
        }
      }
    }
  },
  "required": [
    "conversation_id",
    "sender_name",
    "content"
  ]
}