diff --git a/src/model/activity.rs b/src/model/activity.rs
index 2f49e4d..a2f0759 100644
--- a/src/model/activity.rs
+++ b/src/model/activity.rs
@@ -1,6 +1,9 @@
 use std::ops::DerefMut;
 
-use super::{role::Role, user::User};
+use super::{
+    role::Role,
+    user::{ManageUserUser, User},
+};
 use chrono::{DateTime, Duration, Local, NaiveDateTime, TimeZone, Utc};
 use serde::{Deserialize, Serialize};
 use sqlx::{FromRow, Sqlite, SqlitePool, Transaction};
@@ -14,6 +17,29 @@ pub struct Activity {
     pub keep_until: Option<NaiveDateTime>,
 }
 
+pub enum Reason<'a> {
+    // `User` tried to login with `String` as UserAgent
+    SuccLogin(&'a User, String),
+    // `User` changed the data of `User`, explanation in `String`
+    UserDataChange(&'a ManageUserUser, &'a User, String),
+}
+
+impl From<Reason<'_>> for ActivityBuilder {
+    fn from(value: Reason<'_>) -> Self {
+        match value {
+            Reason::SuccLogin(user, agent) => {
+                Self::new(&format!("{user} hat sich eingeloggt (User-Agent: {agent})"))
+                    .relevant_for_user(user)
+                    .keep_until_days(7)
+            }
+            Reason::UserDataChange(changed_by, changed_user, explanation) => Self::new(&format!(
+                "{changed_by} hat die Daten von {changed_user} aktualisiert: {explanation}"
+            ))
+            .relevant_for_user(changed_user),
+        }
+    }
+}
+
 pub struct ActivityBuilder {
     text: String,
     relevant_for: String,
@@ -21,6 +47,7 @@ pub struct ActivityBuilder {
 }
 
 impl ActivityBuilder {
+    /// TODO: maybe make this private, and only allow specific acitivites defined in `Reason`
     #[must_use]
     pub fn new(text: &str) -> Self {
         Self {
diff --git a/src/model/user/basic.rs b/src/model/user/basic.rs
index 9878d7d..fb9eaad 100644
--- a/src/model/user/basic.rs
+++ b/src/model/user/basic.rs
@@ -2,7 +2,10 @@
 
 use super::{AllowedToEditPaymentStatusUser, ManageUserUser, User};
 use crate::model::{
-    activity::ActivityBuilder, family::Family, mail::valid_mails, notification::Notification,
+    activity::{self, ActivityBuilder},
+    family::Family,
+    mail::valid_mails,
+    notification::Notification,
     role::Role,
 };
 use chrono::NaiveDate;
@@ -19,10 +22,13 @@ impl User {
     ) -> Result<(), String> {
         let note = note.trim();
 
-        ActivityBuilder::new(&format!("({updated_by}) {note}"))
-            .relevant_for_user(user)
-            .save(db)
-            .await;
+        ActivityBuilder::from(activity::Reason::UserDataChange(
+            updated_by,
+            self,
+            format!("Neue Notizen: {note}"),
+        ))
+        .save(db)
+        .await;
 
         Ok(())
     }
@@ -47,18 +53,11 @@ impl User {
             .unwrap(); //Okay, because we can only create a User of a valid id
 
         let msg = match &self.mail {
-            Some(old_mail) => {
-                format!(
-                    "{updated_by} hat die Mail-Adresse von {self} von {old_mail} auf {new_mail} geändert."
-                )
-            }
-            None => {
-                format!("{updated_by} eine neue Mail-Adresse für {self} hinzugefügt: {new_mail}")
-            }
+            Some(old_mail) => format!("Mail-Adresse von {old_mail} auf {new_mail} geändert."),
+            None => format!("Neue Mail-Adresse für: {new_mail}"),
         };
 
-        ActivityBuilder::new(&msg)
-            .relevant_for_user(self)
+        ActivityBuilder::from(activity::Reason::UserDataChange(updated_by, self, msg))
             .save(db)
             .await;
 
@@ -89,19 +88,16 @@ impl User {
         query.execute(db).await.unwrap(); //Okay, because we can only create a User of a valid id
 
         let msg = match &self.phone {
-            Some(old_phone) if new_phone.is_empty() => format!(
-                "{updated_by} hat die Telefonnummer von {self} entfernt (alte Nummer: {old_phone})"
-            ),
-            Some(old_phone) => format!(
-                "{updated_by} hat die Telefonnummer von {self} von {old_phone} auf {new_phone} geändert."
-            ),
-            None => format!(
-                "{updated_by} hat eine neue Telefonnummer für {self} hinzugefügt: {new_phone}"
-            ),
+            Some(old_phone) if new_phone.is_empty() => {
+                format!("Telefonnummer wurde entfernt (alte Nummer: {old_phone})")
+            }
+            Some(old_phone) => {
+                format!("Telefonnummer wurde von {old_phone} auf {new_phone} geändert.")
+            }
+            None => format!("Neue Telefonnummer hinzugefügt: {new_phone}"),
         };
 
-        ActivityBuilder::new(&msg)
-            .relevant_for_user(self)
+        ActivityBuilder::from(activity::Reason::UserDataChange(updated_by, self, msg))
             .save(db)
             .await;
     }
diff --git a/src/tera/auth.rs b/src/tera/auth.rs
index 9440942..425ce22 100644
--- a/src/tera/auth.rs
+++ b/src/tera/auth.rs
@@ -1,5 +1,4 @@
 use rocket::{
-    FromForm, Request, Route, State,
     form::Form,
     get,
     http::{Cookie, CookieJar},
@@ -9,12 +8,13 @@ use rocket::{
     response::{Flash, Redirect},
     routes,
     time::{Duration, OffsetDateTime},
+    FromForm, Request, Route, State,
 };
-use rocket_dyn_templates::{Template, context, tera};
+use rocket_dyn_templates::{context, tera, Template};
 use sqlx::SqlitePool;
 
 use crate::model::{
-    activity::ActivityBuilder,
+    activity::{self, ActivityBuilder},
     log::Log,
     user::{LoginError, User},
 };
@@ -83,13 +83,9 @@ async fn login(
 
     cookies.add_private(Cookie::new("loggedin_user", format!("{}", user.id)));
 
-    ActivityBuilder::new(&format!(
-        "{user} hat sich eingeloggt (User-Agent: {})",
-        agent.0
-    ))
-    .relevant_for_user(&user)
-    .save(db)
-    .await;
+    ActivityBuilder::from(activity::Reason::SuccLogin(&user, agent.0))
+        .save(db)
+        .await;
 
     // Check for redirect_url cookie and redirect accordingly
     match cookies.get_private("redirect_url") {