Automatically remove outdated 2FA successful entries

src/data/user.rs

@@ -190,6 +190,11 @@ impl User {
             .collect::<Vec<_>>()
     }
 
+    pub fn remove_outdated_successful_2fa_attempts(&mut self) {
+        self.last_successful_2fa
+            .retain(|_, t| *t + SECOND_FACTOR_EXEMPTION_AFTER_SUCCESSFUL_LOGIN > time());
+    }
+
     pub fn get_formatted_2fa_successful_logins(&self) -> Vec<Successful2FALogin> {
         self.last_successful_2fa
             .iter()
@@ -301,6 +306,10 @@ impl EntityManager<User> {
     pub fn save_new_successful_2fa_authentication(&mut self, id: &UserID, ip: IpAddr) -> bool {
         self.update_user(id, |mut user| {
             user.last_successful_2fa.insert(ip, time());
+
+            // Remove outdated successful attempts
+            user.remove_outdated_successful_2fa_attempts();
+
             user
         })
     }