diff --git a/flaschengeist/__init__.py b/flaschengeist/__init__.py
index afbfbdc..1f13a7c 100644
--- a/flaschengeist/__init__.py
+++ b/flaschengeist/__init__.py
@@ -1,7 +1,6 @@
 """ Server-package
 
     Initialize app, CORS, database and add it to the application.
-    Initialize also a singleton for the AccessTokenController and start the Thread.
 
 """
 import yaml
diff --git a/flaschengeist/app.py b/flaschengeist/app.py
index f776167..19b0254 100644
--- a/flaschengeist/app.py
+++ b/flaschengeist/app.py
@@ -56,11 +56,14 @@ def __load_plugins(app):
 
 def install_all():
     from flaschengeist.system.database import db
-    from flaschengeist.system.models import user, event, accessToken
+    from flaschengeist.system.models import user, event, session
 
     db.create_all()
     db.session.commit()
     for name, plugin in current_app.config["FG_PLUGINS"].items():
+        if not plugin:
+            logger.debug("Skip disabled plugin {}".format(name))
+            continue
         logger.info("Install plugin {}".format(name))
         plugin.install()
         if plugin.permissions:
diff --git a/flaschengeist/modules/__init__.py b/flaschengeist/modules/__init__.py
index fa0bb92..e84ac55 100644
--- a/flaschengeist/modules/__init__.py
+++ b/flaschengeist/modules/__init__.py
@@ -7,6 +7,7 @@ class Plugin:
     def __init__(self, config=None, blueprint=None, permissions={}):
         self.blueprint = blueprint
         self.permissions = permissions
+        self.version = "dummy"
 
     def install(self):
         """Installation routine
@@ -14,6 +15,11 @@ class Plugin:
         """
         pass
 
+    def serialize(self):
+        return {
+            "version": self.version,
+        }
+
 
 class AuthPlugin(Plugin):
     def login(self, user, pw):
diff --git a/flaschengeist/modules/auth/__init__.py b/flaschengeist/modules/auth/__init__.py
index 0d57e72..0c68b1d 100644
--- a/flaschengeist/modules/auth/__init__.py
+++ b/flaschengeist/modules/auth/__init__.py
@@ -11,9 +11,9 @@ from werkzeug.local import LocalProxy
 from flaschengeist import logger
 from flaschengeist.modules import Plugin
 from flaschengeist.system.decorator import login_required
-from flaschengeist.system.controller import accessTokenController, userController, messageController
+from flaschengeist.system.controller import sessionController, userController, messageController
 
-access_controller = LocalProxy(lambda: accessTokenController.AccessTokenController())
+session_controller = LocalProxy(lambda: sessionController.SessionController())
 auth_bp = Blueprint("auth", __name__)
 
 
@@ -33,10 +33,10 @@ class AuthRoutePlugin(Plugin):
 
 
 @auth_bp.route("/auth", methods=["POST"])
-def _create_token():
+def _login():
     """Login User
 
-    Login in User and create an AccessToken for the User.
+    Login in User and create a Session for the User.
     Requires POST data {'userid': string, 'password': string}
     Returns:
         A JSON-File with user information and created token or errors
@@ -54,55 +54,55 @@ def _create_token():
     if not user:
         raise Unauthorized
     logger.debug("user is {{ {} }}".format(user))
-    token = access_controller.create(user, user_agent=request.user_agent)
-    logger.debug("access token is {{ {} }}".format(token))
+    session = session_controller.create(user, user_agent=request.user_agent)
+    logger.debug("token is {{ {} }}".format(session.token))
     logger.info("User {{ {} }} success login.".format(userid))
 
     # Lets cleanup the DB
-    access_controller.clear_expired()
-    return jsonify({"user": user, "token": token, "permissions": user.get_permissions()})
+    session_controller.clear_expired()
+    return jsonify({"session": session, "permissions": user.get_permissions()})
 
 
 @auth_bp.route("/auth", methods=["GET"])
 @login_required()
 def _get_tokens(access_token, **kwargs):
-    tokens = access_controller.get_users_tokens(access_token.user)
+    tokens = session_controller.get_users_sessions(access_token.user)
     a = messageController.Message(access_token.user, "Go", "Bar")
     messageController.send_message(a)
     return jsonify(tokens)
 
 
-@login_required()
 @auth_bp.route("/auth/<token>", methods=["DELETE"])
-def _delete_token(token, access_token, **kwargs):
+@login_required()
+def _delete_token(access_token, token, **kwargs):
     logger.debug("Try to delete access token {{ {} }}".format(token))
-    token = access_controller.get_token(token, access_token.user)
+    token = session_controller.get_session(token, access_token.user)
     if not token:
         logger.debug("Token not found in database!")
         # Return 403 error, so that users can not bruteforce tokens
         # Valid tokens from other users and invalid tokens now are looking the same
         raise Forbidden
-    access_controller.delete_token(token)
-    access_controller.clear_expired()
+    session_controller.delete_session(token)
+    session_controller.clear_expired()
     return jsonify({"ok": "ok"})
 
 
-@login_required()
 @auth_bp.route("/auth/<token>", methods=["GET"])
+@login_required()
 def _get_token(token, access_token, **kwargs):
     logger.debug("get token {{ {} }}".format(token))
-    token = access_controller.get_token(token, access_token.user)
+    session = session_controller.get_session(token, access_token.user)
     if not token:
         # Return 403 error, so that users can not bruteforce tokens
         # Valid tokens from other users and invalid tokens now are looking the same
         raise Forbidden
-    return jsonify(token)
+    return jsonify({"session": session, "permissions": session.user.get_permissions()})
 
 
-@login_required()
 @auth_bp.route("/auth/<token>", methods=["PUT"])
+@login_required()
 def _set_lifetime(token, access_token, **kwargs):
-    token = access_controller.get_token(token, access_token.user)
+    token = session_controller.get_token(token, access_token.user)
     if not token:
         # Return 403 error, so that users can not bruteforce tokens
         # Valid tokens from other users and invalid tokens now are looking the same
@@ -110,7 +110,7 @@ def _set_lifetime(token, access_token, **kwargs):
     try:
         lifetime = request.get_json()["value"]
         logger.debug("set lifetime {{ {} }} to access token {{ {} }}".format(lifetime, token))
-        access_controller.set_lifetime(token, lifetime)
+        session_controller.set_lifetime(token, lifetime)
         return jsonify({"ok": "ok"})
     except (KeyError, TypeError):
         raise BadRequest
diff --git a/flaschengeist/modules/auth_ldap/__init__.py b/flaschengeist/modules/auth_ldap/__init__.py
index 2a97a77..d8cd710 100644
--- a/flaschengeist/modules/auth_ldap/__init__.py
+++ b/flaschengeist/modules/auth_ldap/__init__.py
@@ -37,17 +37,17 @@ class AuthLDAP(AuthPlugin):
     def login(self, user, password):
         if not user:
             return False
-        return self.ldap.authenticate(user.uid, password, "uid", self.dn)
+        return self.ldap.authenticate(user.userid, password, "uid", self.dn)
 
     def update_user(self, user):
         self.ldap.connection.search(
             "ou=user,{}".format(self.dn),
-            "(uid={})".format(user.uid),
+            "(uid={})".format(user.userid),
             SUBTREE,
             attributes=["uid", "givenName", "sn", "mail"],
         )
         r = self.ldap.connection.response[0]["attributes"]
-        if r["uid"][0] == user.uid:
+        if r["uid"][0] == user.userid:
             user.set_attribute("DN", self.ldap.connection.response[0]["dn"])
             user.firstname = r["givenName"][0]
             user.lastname = r["sn"][0]
@@ -55,7 +55,7 @@ class AuthLDAP(AuthPlugin):
                 user.mail = r["mail"][0]
             if "displayName" in r:
                 user.display_name = r["displayName"][0]
-            for group in self._get_groups(user.uid):
+            for group in self._get_groups(user.userid):
                 user.add_role(group)
 
     def _get_groups(self, uid):
diff --git a/flaschengeist/modules/auth_plain/__init__.py b/flaschengeist/modules/auth_plain/__init__.py
index 872d723..4bb87c0 100644
--- a/flaschengeist/modules/auth_plain/__init__.py
+++ b/flaschengeist/modules/auth_plain/__init__.py
@@ -2,7 +2,7 @@ import binascii
 import hashlib
 import os
 
-import flaschengeist.modules as modules
+from flaschengeist.modules import AuthPlugin
 from flaschengeist.system.models.user import User
 
 
@@ -21,7 +21,7 @@ def _verify_password(stored_password, provided_password):
     return pass_hash == stored_password
 
 
-class AuthPlain(modules.Auth):
+class AuthPlain(AuthPlugin):
     def login(self, user: User, password: str):
         if user and "password" in user.attributes:
             return _verify_password(user.attributes["password"].value, password)
diff --git a/flaschengeist/modules/geruecht/baruser/routes.py b/flaschengeist/modules/geruecht/baruser/routes.py
index dc7c383..0d9dbf1 100644
--- a/flaschengeist/modules/geruecht/baruser/routes.py
+++ b/flaschengeist/modules/geruecht/baruser/routes.py
@@ -42,7 +42,7 @@ def _bar(**kwargs):
                         type = 'credit'
                     else:
                         type = 'amount'
-                    dic[user.uid] = {"username": user.uid,
+                    dic[user.userid] = {"username": user.userid,
                                      "firstname": user.firstname,
                                      "lastname": user.lastname,
                                      "amount": all,
@@ -50,8 +50,8 @@ def _bar(**kwargs):
                                      "type": type,
                                      "limit": user.limit,
                                      "autoLock": user.autoLock
-                                     }
-                    dic[user.uid]['last_seen'] = {"year": user.last_seen.year, "month": user.last_seen.month, "day": user.last_seen.day, "hour": user.last_seen.hour, "minute": user.last_seen.minute, "second": user.last_seen.second} if user.last_seen else None
+                                        }
+                    dic[user.userid]['last_seen'] = {"year": user.last_seen.year, "month": user.last_seen.month, "day": user.last_seen.day, "hour": user.last_seen.hour, "minute": user.last_seen.minute, "second": user.last_seen.second} if user.last_seen else None
         debug.debug("return {{ {} }}".format(dic))
         return jsonify(dic)
     except Exception as err:
diff --git a/flaschengeist/modules/geruecht/databaseController/dbCreditListController.py b/flaschengeist/modules/geruecht/databaseController/dbCreditListController.py
index 62a3528..7011ea7 100644
--- a/flaschengeist/modules/geruecht/databaseController/dbCreditListController.py
+++ b/flaschengeist/modules/geruecht/databaseController/dbCreditListController.py
@@ -10,7 +10,7 @@ class Base:
     def getCreditListFromUser(self, user, **kwargs):
         try:
             if type(user) is User:
-                if user.uid == 'extern':
+                if user.userid == 'extern':
                     return []
             cursor = self.db.connection.cursor()
             if 'year' in kwargs:
diff --git a/flaschengeist/modules/geruecht/databaseController/dbUserController.py b/flaschengeist/modules/geruecht/databaseController/dbUserController.py
index 4c1dd1c..f93110e 100644
--- a/flaschengeist/modules/geruecht/databaseController/dbUserController.py
+++ b/flaschengeist/modules/geruecht/databaseController/dbUserController.py
@@ -83,7 +83,7 @@ class Base:
             cursor = self.db.connection.cursor()
             groups = self._convertGroupToString(user.group)
             cursor.execute("insert into user (uid, dn, firstname, lastname, gruppe, lockLimit, locked, autoLock, mail) VALUES ('{}','{}','{}','{}','{}',{},{},{},'{}')".format(
-                user.uid, user.dn, user.firstname, user.lastname, groups, user.limit, user.locked, user.autoLock, user.mail))
+                user.userid, user.dn, user.firstname, user.lastname, groups, user.limit, user.locked, user.autoLock, user.mail))
             self.db.connection.commit()
         except Exception as err:
             traceback.print_exc()
@@ -96,7 +96,7 @@ class Base:
             cursor = self.db.connection.cursor()
             groups = self._convertGroupToString(user.group)
             sql = "update user set dn='{}', firstname='{}', lastname='{}', gruppe='{}', lockLimit={}, locked={}, autoLock={}, mail='{}' where uid='{}'".format(
-                user.dn, user.firstname, user.lastname, groups, user.limit, user.locked, user.autoLock, user.mail, user.uid)
+                user.dn, user.firstname, user.lastname, groups, user.limit, user.locked, user.autoLock, user.mail, user.userid)
             print(sql)
             cursor.execute(sql)
             self.db.connection.commit()
@@ -109,7 +109,7 @@ class Base:
         try:
             cursor = self.db.connection.cursor()
             sql = "update user set last_seen='{}' where uid='{}'".format(
-                time, user.uid)
+                time, user.userid)
             print(sql)
             cursor.execute(sql)
             self.db.connection.commit()
diff --git a/flaschengeist/modules/geruecht/finanzer/routes.py b/flaschengeist/modules/geruecht/finanzer/routes.py
index 8b2e2fa..2e8d561 100644
--- a/flaschengeist/modules/geruecht/finanzer/routes.py
+++ b/flaschengeist/modules/geruecht/finanzer/routes.py
@@ -29,8 +29,8 @@ def _getFinanzer(**kwargs):
         users = mainController.getAllUsersfromDB()
         dic = {}
         for user in users:
-            dic[user.uid] = user.toJSON()
-            dic[user.uid]['creditList'] = {
+            dic[user.userid] = user.toJSON()
+            dic[user.userid]['creditList'] = {
                 credit.year: credit.toJSON() for credit in user.geruechte}
         debug.debug("return {{ {} }}".format(dic))
         return jsonify(dic)
@@ -168,8 +168,8 @@ def _finanzerAddUser(**kwargs):
         users = mainController.getAllUsersfromDB()
         dic = {}
         for user in users:
-            dic[user.uid] = user.toJSON()
-            dic[user.uid]['creditList'] = {
+            dic[user.userid] = user.toJSON()
+            dic[user.userid]['creditList'] = {
                 credit.year: credit.toJSON() for credit in user.geruechte}
         debug.debug("return {{ {} }}".format(dic))
         return jsonify(dic), 200
diff --git a/flaschengeist/modules/geruecht/mainController/__init__.py b/flaschengeist/modules/geruecht/mainController/__init__.py
index 61ce1b5..1d6f3f8 100644
--- a/flaschengeist/modules/geruecht/mainController/__init__.py
+++ b/flaschengeist/modules/geruecht/mainController/__init__.py
@@ -94,9 +94,9 @@ class MainController(#mainJobKindController.Base,
 
     def __updateDataFromLDAP(self, user):
         logger.info("update data from ldap for user {{ {} }}".format(user))
-        groups = ldap.getGroup(user.uid)
+        groups = ldap.getGroup(user.userid)
         logger.debug("ldap gorups are {{ {} }}".format(groups))
-        user_data = ldap.getUserData(user.uid)
+        user_data = ldap.getUserData(user.userid)
         logger.debug("ldap data is {{ {} }}".format(user_data))
         user_data['gruppe'] = groups
         user_data['group'] = groups
diff --git a/flaschengeist/modules/geruecht/mainController/mainCreditListController.py b/flaschengeist/modules/geruecht/mainController/mainCreditListController.py
index 7e6f19f..9c56e6e 100644
--- a/flaschengeist/modules/geruecht/mainController/mainCreditListController.py
+++ b/flaschengeist/modules/geruecht/mainController/mainCreditListController.py
@@ -34,7 +34,7 @@ class Base:
             amount, username, month, year))
         user = self.getUser(username)
         debug.debug("user is {{ {} }}".format(user))
-        if user.uid == 'extern':
+        if user.userid == 'extern':
             debug.debug("user is extern user, so exit add amount")
             return
         if not user.locked or finanzer:
@@ -60,7 +60,7 @@ class Base:
             credit, username, month, year))
         user = self.getUser(username)
         debug.debug("user is {{ {} }}".format(user))
-        if user.uid == 'extern':
+        if user.userid == 'extern':
             debug.debug("user is extern user, so exit add credit")
             return
         user.addCredit(credit, year=year, month=month)
diff --git a/flaschengeist/modules/users/__init__.py b/flaschengeist/modules/users/__init__.py
index d168c3d..28f2247 100644
--- a/flaschengeist/modules/users/__init__.py
+++ b/flaschengeist/modules/users/__init__.py
@@ -57,7 +57,7 @@ def __edit_user(uid, **kwargs):
     if not user:
         raise NotFound
 
-    if uid != kwargs["access_token"].user.uid and user.has_permissions(permissions["EDIT_USER"]):
+    if uid != kwargs["access_token"].user.userid and user.has_permissions(permissions["EDIT_USER"]):
         return Forbidden
 
     data = request.get_json()
diff --git a/flaschengeist/system/controller/accessTokenController.py b/flaschengeist/system/controller/sessionController.py
similarity index 55%
rename from flaschengeist/system/controller/accessTokenController.py
rename to flaschengeist/system/controller/sessionController.py
index 17fe644..f92ace7 100644
--- a/flaschengeist/system/controller/accessTokenController.py
+++ b/flaschengeist/system/controller/sessionController.py
@@ -1,5 +1,5 @@
 import secrets
-from ..models.accessToken import AccessToken
+from ..models.session import Session
 from flaschengeist.system.database import db
 from flaschengeist import logger
 from werkzeug.exceptions import Forbidden
@@ -7,22 +7,22 @@ from datetime import datetime, timezone
 from . import Singleton
 
 
-class AccessTokenController(metaclass=Singleton):
-    """Control all created AccessToken
+class SessionController(metaclass=Singleton):
+    """Control all created Sessions
 
-    This Class create, delete, find and manage AccessToken.
+    This Class create, delete, find and manage Sessions.
 
     Attributes:
-        lifetime: Variable for the Lifetime of one AccessToken in seconds.
+        lifetime: Variable for the Lifetime of a Session in seconds.
     """
 
     def __init__(self, lifetime=1800):
         self.lifetime = lifetime
 
     def validate_token(self, token, user_agent, permissions):
-        """Verify access token
+        """Verify session
 
-        Verify an AccessToken and Roles so if the User has permission or not.
+        Verify a Session and Roles so if the User has permission or not.
         Retrieves the access token if valid else retrieves False
 
         Args:
@@ -30,10 +30,10 @@ class AccessTokenController(metaclass=Singleton):
             user_agent: User agent of browser to check
             permissions: Permissions needed to access restricted routes
         Returns:
-            An the AccessToken for this given Token or False.
+            A Session for this given Token or False.
         """
         logger.debug("check token {{ {} }} is valid".format(token))
-        access_token = AccessToken.query.filter_by(token=token).one_or_none()
+        access_token = Session.query.filter_by(token=token).one_or_none()
         if access_token:
             logger.debug("token found, check if expired or invalid user agent differs")
             if access_token.expires >= datetime.utcnow() and (
@@ -45,34 +45,34 @@ class AccessTokenController(metaclass=Singleton):
                     return access_token
             else:
                 logger.debug("access token is out of date or invalid client used")
-                self.delete_token(access_token)
+                self.delete_session(access_token)
         logger.debug("no valid access token with token: {{ {} }} and permissions: {{ {} }}".format(token, permissions))
         return False
 
-    def create(self, user, user_agent=None) -> AccessToken:
-        """Create an AccessToken
+    def create(self, user, user_agent=None) -> Session:
+        """Create a Session
 
         Args:
-            user: For which User is to create an AccessToken
+            user: For which User is to create a Session
             user_agent: User agent to identify session
 
         Returns:
-                AccessToken: A created Token for User
+                Session: A created Token for User
         """
         logger.debug("create access token")
         token_str = secrets.token_hex(16)
-        token = AccessToken(
+        session = Session(
             token=token_str, user=user, lifetime=self.lifetime, browser=user_agent.browser, platform=user_agent.platform
         )
-        token.refresh()
-        db.session.add(token)
+        session.refresh()
+        db.session.add(session)
         db.session.commit()
 
-        logger.debug("access token is {{ {} }}".format(token))
-        return token
+        logger.debug("access token is {{ {} }}".format(session.token))
+        return session
 
-    def get_token(self, token, owner=None):
-        """Retrieves AccessToken from token string
+    def get_session(self, token, owner=None):
+        """Retrieves Session from token string
 
         Args:
             token (str): Token string
@@ -81,38 +81,38 @@ class AccessTokenController(metaclass=Singleton):
         Raises:
             Forbidden: Raised if owner is set but does not match
         Returns:
-            AccessToken: Token object identified by given token string
+            Session: Token object identified by given token string
         """
-        access_token = AccessToken.query.filter(AccessToken.token == token).one_or_none()
-        if access_token and (owner and owner != access_token.user):
+        session = Session.query.filter(Session.token == token).one_or_none()
+        if session and (owner and owner != session.user):
             raise Forbidden
-        return access_token
+        return session
 
-    def get_users_tokens(self, user):
-        return AccessToken.query.filter(AccessToken.user == user)
+    def get_users_sessions(self, user):
+        return Session.query.filter(Session.user == user)
 
     @staticmethod
-    def delete_token(token: AccessToken):
-        """Deletes given AccessToken
+    def delete_session(token: Session):
+        """Deletes given Session
 
         Args:
-            token (AccessToken): Token to delete
+            token (Session): Token to delete
         """
         db.session.delete(token)
         db.session.commit()
 
     @staticmethod
-    def update_token(token):
-        token.refresh()
+    def update_session(session):
+        session.refresh()
         db.session.commit()
 
-    def set_lifetime(self, token, lifetime):
-        token.lifetime = lifetime
-        self.update_token(token)
+    def set_lifetime(self, session, lifetime):
+        session.lifetime = lifetime
+        self.update_session(session)
 
     def clear_expired(self):
         """Remove expired tokens from database"""
-        logger.debug("Clear expired AccessToken")
-        deleted = AccessToken.query.filter(AccessToken.expires < datetime.utcnow()).delete()
-        logger.debug("{} tokens have been removed".format(deleted))
+        logger.debug("Clear expired Sessions")
+        deleted = Session.query.filter(Session.expires < datetime.utcnow()).delete()
+        logger.debug("{} sessions have been removed".format(deleted))
         db.session.commit()
diff --git a/flaschengeist/system/controller/userController.py b/flaschengeist/system/controller/userController.py
index f986534..67a2008 100644
--- a/flaschengeist/system/controller/userController.py
+++ b/flaschengeist/system/controller/userController.py
@@ -7,9 +7,9 @@ from flaschengeist import logger
 
 def login_user(username, password):
     logger.info("login user {{ {} }}".format(username))
-    user = User.query.filter_by(uid=username).one_or_none()
+    user = User.query.filter(User.userid == username).one_or_none()
     if user is None:
-        user = User(uid=username)
+        user = User(userid=username)
         db.session.add(user)
     if current_app.config["FG_AUTH_BACKEND"].login(user, password):
         update_user(user)
@@ -49,4 +49,4 @@ def get_user_by_role(role: Role):
 
 
 def get_user(uid):
-    return User.query.filter(User.uid == uid).one_or_none()
+    return User.query.filter(User.userid == uid).one_or_none()
diff --git a/flaschengeist/system/decorator.py b/flaschengeist/system/decorator.py
index 9a8a6f4..4b703f5 100644
--- a/flaschengeist/system/decorator.py
+++ b/flaschengeist/system/decorator.py
@@ -6,9 +6,9 @@ from flaschengeist import logger
 
 
 def login_required(**kwargs):
-    from .controller.accessTokenController import AccessTokenController
+    from .controller.sessionController import SessionController
 
-    ac_controller = AccessTokenController()
+    ac_controller = SessionController()
     permissions = None
     if "permissions" in kwargs:
         permissions = kwargs["roles"]
@@ -16,7 +16,7 @@ def login_required(**kwargs):
     def real_decorator(func):
         @wraps(func)
         def wrapper(*args, **kwargs):
-            token = request.headers.get("Token")
+            token = request.headers.get("Authorization").split(" ")[-1]
             access_token = ac_controller.validate_token(token, request.user_agent, permissions)
             if access_token:
                 kwargs["access_token"] = access_token
diff --git a/flaschengeist/system/models/accessToken.py b/flaschengeist/system/models/session.py
similarity index 65%
rename from flaschengeist/system/models/accessToken.py
rename to flaschengeist/system/models/session.py
index f94212c..2a1857a 100644
--- a/flaschengeist/system/models/accessToken.py
+++ b/flaschengeist/system/models/session.py
@@ -1,11 +1,13 @@
 from datetime import datetime, timedelta, timezone
+
+from .user import User
 from ..database import db
 from secrets import compare_digest
 from flaschengeist import logger
 
 
-class AccessToken(db.Model):
-    """Model for an AccessToken
+class Session(db.Model):
+    """Model for a Session
 
     Args:
         expires: Is a Datetime from current Time.
@@ -16,20 +18,20 @@ class AccessToken(db.Model):
     __tablename__ = "session"
     id = db.Column(db.Integer, primary_key=True)
     user_id = db.Column(db.Integer, db.ForeignKey("user.id"))
-    user = db.relationship("User", back_populates="sessions")
+    user: User = db.relationship("User", back_populates="sessions")
 
-    expires = db.Column(db.DateTime)
-    token = db.Column(db.String(32), unique=True)
-    lifetime = db.Column(db.Integer)
-    browser = db.Column(db.String(30))
-    platform = db.Column(db.String(30))
+    expires: datetime = db.Column(db.DateTime)
+    token: str = db.Column(db.String(32), unique=True)
+    lifetime: int = db.Column(db.Integer)
+    browser: str = db.Column(db.String(30))
+    platform: str = db.Column(db.String(30))
 
     def refresh(self):
         """Update the Timestamp
 
         Update the Timestamp to the current Time.
         """
-        logger.debug("update timestamp from access token {{ {} }}".format(self))
+        logger.debug("update timestamp from session with token {{ {} }}".format(self))
         self.expires = datetime.utcnow() + timedelta(seconds=self.lifetime)
 
     def serialize(self):
@@ -42,14 +44,10 @@ class AccessToken(db.Model):
             "token": self.token,
             "expires": self.expires.replace(tzinfo=timezone.utc),
             "lifetime": self.lifetime,
+            "user": self.user,
             "browser": self.browser,
             "platform": self.platform,
         }
 
     def __eq__(self, token):
         return compare_digest(self.token, token)
-
-    def __str__(self):
-        return "AccessToken(user={}, token={}, expires={}, lifetime={})".format(
-            self.user, self.token, self.expires, self.lifetime
-        )
diff --git a/flaschengeist/system/models/user.py b/flaschengeist/system/models/user.py
index 522611c..8fb1624 100644
--- a/flaschengeist/system/models/user.py
+++ b/flaschengeist/system/models/user.py
@@ -28,13 +28,13 @@ class User(db.Model):
 
     __tablename__ = "user"
     id = db.Column(db.Integer, primary_key=True)
-    uid = db.Column(db.String(30))
+    userid = db.Column(db.String(30))
     display_name = db.Column(db.String(30))
     firstname = db.Column(db.String(30))
     lastname = db.Column(db.String(30))
     mail = db.Column(db.String(30))
     roles = db.relationship("Role", secondary=association_table)
-    sessions = db.relationship("AccessToken", back_populates="user")
+    sessions = db.relationship("Session", back_populates="user")
     attributes = db.relationship(
         "UserAttribute", collection_class=attribute_mapped_collection("name"), cascade="all, delete"
     )
@@ -53,8 +53,8 @@ class User(db.Model):
 
     def update_data(self, data):
         logger.debug("update data of user")
-        if "uid" in data:
-            self.uid = data["uid"]
+        if "userid" in data:
+            self.userid = data["userid"]
         if "firstname" in data:
             self.firstname = data["firstname"]
         if "lastname" in data:
@@ -76,7 +76,7 @@ class User(db.Model):
 
     def serialize(self):
         return {
-            "userid": self.uid,
+            "userid": self.userid,
             "display_name": self.display_name,
             "firstname": self.firstname,
             "lastname": self.lastname,