sequenceDiagram
    autonumber
    participant S as Scheduled reminder or saved change
    participant N as Delivery coordination
    participant R as Current raid state
    participant D as Discord adapter
    participant P as Player or officer
    S->>N: Request reminder, post update or material-change alert
    N->>R: Read current schedule, assignment and recipient permissions
    alt Obsolete request or already delivered
        N->>N: Suppress duplicate or outdated message
    else Current and authorized
        N->>D: Send using stable delivery identity
        alt Discord rejects or transport fails
            D-->>N: Failure with retry or permission information
            N->>N: Retain delivery state and expose actionable failure
        else Delivery succeeds
            D-->>P: Show reminder or change
            D-->>N: Record message reference and delivery outcome
        end
    end