message-board-v2

(define-data-var message-counter uint u0)

(define-map messages uint {
    author: principal,
    content: (string-utf8 256),
    timestamp: uint
})

(define-public (post-message (content (string-utf8 256)))
    (let ((msg-id (var-get message-counter)))
        (map-set messages msg-id {
            author: tx-sender,
            content: content,
            timestamp: stacks-block-height
        })
        (var-set message-counter (+ msg-id u1))
        (ok msg-id)
    )
)

(define-read-only (get-message (msg-id uint))
    (ok (map-get? messages msg-id))
)