/// An authentication key which has an expiration time.
/// After that time is will automatically become invalid.
#[derive(Serialize, Deserialize, Debug, Eq, PartialEq, Clone)]
pub struct ExpiringKey {
    /// Random 32-char string. For example: `YZSl4lMZupRuOpSRC3krIKR5BPB14nrJ`
    pub key: Key,
    /// Timestamp, the key will be no longer valid after this timestamp
    pub valid_until: DurationSinceUnixEpoch,
}

pub struct ExpiringKey {
    pub key: Key,
    pub valid_until: Option<DurationSinceUnixEpoch>,
}