diff --git a/web/blueprints/auth.py b/web/blueprints/auth.py
index 6aa8164..0e7cf46 100644
--- a/web/blueprints/auth.py
+++ b/web/blueprints/auth.py
@@ -85,6 +85,10 @@ def admin_login():
 
 @auth.route("/logout", methods=["POST"])
 def logout():
+    user_id  = session.get("user_id")
+    username = session.get("username")
+    if user_id:
+        log_audit_event(user_id, username, "session.logout", ip_address=request.remote_addr)
     session.clear()
     return redirect(url_for("auth.login"))
 
diff --git a/web/blueprints/group_admin.py b/web/blueprints/group_admin.py
index 8e7ba42..5d2ca24 100644
--- a/web/blueprints/group_admin.py
+++ b/web/blueprints/group_admin.py
@@ -345,6 +345,12 @@ def database():
                 )
                 test_conn.close()
                 db.set_group_db_creds(group_id, host, int(port), user, password, database_name)
+                db.log_audit_event(
+                    session["user_id"], session["username"], "db.credentials_changed",
+                    entity_type="group", entity_id=group_id,
+                    details={"host": host, "port": port, "database": database_name},
+                    group_id=group_id, ip_address=request.remote_addr,
+                )
                 flash("Database connection saved and tested ✓", "success")
                 return redirect(url_for("group_admin.database"))
             except Exception as e:
@@ -357,6 +363,12 @@ def database():
 @group_admin.route("/database/delete", methods=["POST"])
 @group_admin_required
 def database_delete():
-    db.delete_group_db_creds(session["group_id"])
+    group_id = session["group_id"]
+    db.delete_group_db_creds(group_id)
+    db.log_audit_event(
+        session["user_id"], session["username"], "db.credentials_deleted",
+        entity_type="group", entity_id=group_id,
+        group_id=group_id, ip_address=request.remote_addr,
+    )
     flash("Database connection removed.", "success")
     return redirect(url_for("group_admin.database"))
diff --git a/web/blueprints/site_admin.py b/web/blueprints/site_admin.py
index 6f7d759..25aed60 100644
--- a/web/blueprints/site_admin.py
+++ b/web/blueprints/site_admin.py
@@ -216,6 +216,11 @@ def group_delete(group_id):
 @site_admin.route("/groups/<int:group_id>/members")
 @admin_required
 def group_members(group_id):
+    db.log_audit_event(
+        session["user_id"], session["username"], "admin.view_group_members",
+        entity_type="group", entity_id=group_id,
+        ip_address=request.remote_addr,
+    )
     group   = db.get_group_by_id(group_id)
     members = db.get_group_members(group_id)
     pending_invites = db.list_active_group_invites(group_id)
@@ -424,6 +429,10 @@ def group_invite_resend(group_id, invite_id):
 @site_admin.route("/users")
 @admin_required
 def users():
+    db.log_audit_event(
+        session["user_id"], session["username"], "admin.view_users",
+        ip_address=request.remote_addr,
+    )
     return render_template(
         "admin/users.html",
         users=db.list_all_users(),
@@ -597,6 +606,12 @@ def user_edit(user_id):
         db.update_user(user_id, username, email, is_site_admin)
         if new_password:
             db.change_password(user_id, new_password)
+            db.log_audit_event(
+                session["user_id"], session["username"], "user.password_changed",
+                entity_type="user", entity_id=user_id,
+                details={"target": username},
+                ip_address=request.remote_addr,
+            )
             flash("Password changed.", "info")
         db.log_audit_event(
             session["user_id"], session["username"], "user.updated",
@@ -715,4 +730,18 @@ def audit_log():
         actor_filter=actor_f or "",
         all_groups=all_groups,
         actions=actions,
+        retention_days=Config.AUDIT_LOG_RETENTION_DAYS,
     )
+
+
+@site_admin.route("/audit/purge", methods=["POST"])
+@admin_required
+def audit_purge():
+    deleted = db.purge_old_audit_events(Config.AUDIT_LOG_RETENTION_DAYS)
+    db.log_audit_event(
+        session["user_id"], session["username"], "audit.purged",
+        details={"deleted_count": deleted, "retention_days": Config.AUDIT_LOG_RETENTION_DAYS},
+        ip_address=request.remote_addr,
+    )
+    flash(f"Purged {deleted} audit log entries older than {Config.AUDIT_LOG_RETENTION_DAYS} days.", "success")
+    return redirect(url_for("site_admin.audit_log"))
diff --git a/web/config.py b/web/config.py
index dafd17d..0cfb236 100644
--- a/web/config.py
+++ b/web/config.py
@@ -58,6 +58,12 @@ class Config:
     INVITE_MAX_ACTIVE_PER_GROUP = int(os.getenv("INVITE_MAX_ACTIVE_PER_GROUP") or "200")
     INVITE_RESEND_COOLDOWN_SECONDS = int(os.getenv("INVITE_RESEND_COOLDOWN_SECONDS") or "120")
 
+    # ── Audit-Log-Aufbewahrung ────────────────────────────────
+    # Audit-Log-Einträge, die älter als dieser Wert (in Tagen) sind, werden automatisch gelöscht.
+    # IP-Adressen gelten als personenbezogene Daten (DSGVO Art. 4 Nr. 1); nach 90 Tagen sollten
+    # diese nicht mehr benötigt werden. Auf 0 setzen, um automatisches Löschen zu deaktivieren.
+    AUDIT_LOG_RETENTION_DAYS = int(os.getenv("AUDIT_LOG_RETENTION_DAYS") or "90")
+
     DEFAULT_PERMISSIONS = {
         "view_dashboard":     True,
         "view_players":       True,
diff --git a/web/panel_db.py b/web/panel_db.py
index 29e360f..29dca34 100644
--- a/web/panel_db.py
+++ b/web/panel_db.py
@@ -237,6 +237,9 @@ def init_databases():
     finally:
         creds.close()
 
+    # Auto-Bereinigung: Audit-Log-Einträge älter als Retention-Tage löschen
+    purge_old_audit_events(Config.AUDIT_LOG_RETENTION_DAYS)
+
 
 # ─────────────────────────────────────────────────────────────
 # Nutzer
@@ -812,3 +815,30 @@ def get_audit_log_distinct_actions() -> list[str]:
     rows = _panel_query("SELECT DISTINCT action FROM audit_log ORDER BY action")
     return [r["action"] for r in rows] if rows else []
 
+
+def purge_old_audit_events(retention_days: int) -> int:
+    """Deletes audit log entries older than *retention_days* days.
+    Returns the number of deleted rows. Skips if retention_days <= 0."""
+    import logging
+    _log = logging.getLogger(__name__)
+    if retention_days <= 0:
+        return 0
+    try:
+        conn = get_panel_db()
+        try:
+            with conn.cursor() as cur:
+                cur.execute(
+                    "DELETE FROM audit_log WHERE created_at < UTC_TIMESTAMP() - INTERVAL %s DAY",
+                    (retention_days,),
+                )
+                deleted = cur.rowcount
+            conn.commit()
+        finally:
+            conn.close()
+        if deleted:
+            _log.info("Purged %d audit log entries older than %d days", deleted, retention_days)
+        return deleted
+    except Exception as exc:
+        _log.warning("Failed to purge audit log: %s", exc)
+        return 0
+
diff --git a/web/templates/admin/audit_log.html b/web/templates/admin/audit_log.html
index 352a30c..1f7c68c 100644
--- a/web/templates/admin/audit_log.html
+++ b/web/templates/admin/audit_log.html
@@ -4,7 +4,22 @@
 {% block content %}
 <div class="d-flex align-items-center justify-content-between mb-3">
     <h4 class="mb-0"><i class="bi bi-journal-text me-2"></i>Audit Log</h4>
-    <span class="text-muted small">{{ total }} event{{ 's' if total != 1 }}</span>
+    <div class="d-flex align-items-center gap-3">
+        <span class="text-muted small">{{ total }} event{{ 's' if total != 1 }}</span>
+        {% if retention_days > 0 %}
+        <span class="badge bg-secondary" title="Entries older than {{ retention_days }} days are deleted automatically on startup">
+            <i class="bi bi-clock-history me-1"></i>Retention: {{ retention_days }}d
+        </span>
+        {% endif %}
+        <form method="post" action="{{ url_for('site_admin.audit_purge') }}"
+              onsubmit="return confirm('Delete all audit entries older than {{ retention_days }} days?')">
+            <input type="hidden" name="csrf_token" value="{{ session.get('csrf_token', '') }}">
+            <button type="submit" class="btn btn-sm btn-outline-danger"
+                    {% if retention_days <= 0 %}disabled title="Retention disabled (AUDIT_LOG_RETENTION_DAYS=0)"{% endif %}>
+                <i class="bi bi-trash3 me-1"></i>Purge now
+            </button>
+        </form>
+    </div>
 </div>
 
 <!-- Filters -->
@@ -75,25 +90,33 @@
                     </td>
                     <td>
                         {% set action_class = {
-                            'user.login':          'badge bg-success',
-                            'user.login_failed':   'badge bg-danger',
-                            'admin.login':         'badge bg-warning text-dark',
-                            'admin.login_failed':  'badge bg-danger',
-                            'invite.created':      'badge bg-primary',
-                            'invite.accepted':     'badge bg-success',
-                            'invite.revoked':      'badge bg-secondary',
-                            'invite.resent':       'badge bg-info text-dark',
-                            'member.added':        'badge bg-primary',
-                            'member.removed':      'badge bg-danger',
-                            'member.role_changed': 'badge bg-warning text-dark',
-                            'member.updated':      'badge bg-warning text-dark',
-                            'group.created':       'badge bg-success',
-                            'group.updated':       'badge bg-secondary',
-                            'group.deleted':       'badge bg-danger',
-                            'user.updated':        'badge bg-secondary',
-                            'user.deleted':        'badge bg-danger',
-                            'mail.settings_saved': 'badge bg-info text-dark',
-                            'mail.settings_deleted':'badge bg-danger',
+                            'user.login':                'badge bg-success',
+                            'user.login_failed':         'badge bg-danger',
+                            'user.password_changed':     'badge bg-warning text-dark',
+                            'session.logout':            'badge bg-secondary',
+                            'admin.login':               'badge bg-warning text-dark',
+                            'admin.login_failed':        'badge bg-danger',
+                            'admin.view_users':          'badge bg-dark border border-secondary',
+                            'admin.view_group':          'badge bg-dark border border-secondary',
+                            'admin.view_group_members':  'badge bg-dark border border-secondary',
+                            'invite.created':            'badge bg-primary',
+                            'invite.accepted':           'badge bg-success',
+                            'invite.revoked':            'badge bg-secondary',
+                            'invite.resent':             'badge bg-info text-dark',
+                            'member.added':              'badge bg-primary',
+                            'member.removed':            'badge bg-danger',
+                            'member.role_changed':       'badge bg-warning text-dark',
+                            'member.updated':            'badge bg-warning text-dark',
+                            'group.created':             'badge bg-success',
+                            'group.updated':             'badge bg-secondary',
+                            'group.deleted':             'badge bg-danger',
+                            'db.credentials_changed':    'badge bg-warning text-dark',
+                            'db.credentials_deleted':    'badge bg-danger',
+                            'user.updated':              'badge bg-secondary',
+                            'user.deleted':              'badge bg-danger',
+                            'mail.settings_saved':       'badge bg-info text-dark',
+                            'mail.settings_deleted':     'badge bg-danger',
+                            'audit.purged':              'badge bg-danger',
                         } %}
                         <span class="{{ action_class.get(row.action, 'badge bg-secondary') }} font-monospace" style="font-size:.75em">
                             {{ row.action }}