fix: post edit/delete limited to 30m

[ayush00git]

CLoses #81

used time.Since to check how time passed since the post was created, throuh the CreatedAt field, restricted the edit and delete post window to 30 minutes. Backend apis now sync responses to frontend to render the edit and delete icon at the frontend.

if time.Since(CreatedAt) >= 30 * time.Minute {
    c.JSON(403, ...)
    return
}