{"$schema":"http://json-schema.org/draft-07/schema#","schemaId":"550e8400-e29b-41d4-a716-446655440004","title":"Message","type":"object","properties":{"id":{"type":"string","format":"uuid","description":"The unique identifier for the message"},"chatId":{"type":"string","format":"uuid","description":"The ID of the chat this message belongs to"},"senderId":{"type":"string","format":"uuid","description":"The ID of the user who sent the message"},"content":{"type":"string","description":"The text content of the message"},"type":{"type":"string","enum":["text","image","file","system"],"description":"The type of message content"},"mediaUrl":{"type":"string","format":"uri","description":"URL to media attachment if message type is image or file"},"readBy":{"type":"array","items":{"type":"string","format":"uuid"},"description":"Array of user IDs who have read the message"},"createdAt":{"type":"string","format":"date-time","description":"When the message was created"},"updatedAt":{"type":"string","format":"date-time","description":"When the message was last updated"},"isArchived":{"type":"boolean","description":"Whether the message is archived"}},"required":["id","chatId","senderId","content","type","createdAt"],"additionalProperties":false}