diff --git a/src/server/BreCal/api/__init__.py b/src/server/BreCal/api/__init__.py
index 1803976..a8b173a 100644
--- a/src/server/BreCal/api/__init__.py
+++ b/src/server/BreCal/api/__init__.py
@@ -2,7 +2,8 @@ import typing
 import datetime
 
 # global dictionary, which informs about the latest change of a given database (e.g., 'berths')
-latest_get_request_dict = {database:None for database in ["berths", "history", "notifications", "participant", "shipcalls", "ships", "times", "user"]}
+# initialize all values as null (None)
+latest_get_request_dict = {database:None for database in ["berths", "history", "notifications", "participants", "shipcalls", "ships", "times"]}
 
 def update_latest_modification_time(key:str, modification_time:datetime.datetime)->None:
     """
@@ -10,7 +11,7 @@ def update_latest_modification_time(key:str, modification_time:datetime.datetime
     *if* the time is more recent than the currently stored value
     """
     global latest_get_request_dict
-    print(f"(update_latest_modification_time INFO): before executing the funtion", latest_get_request_dict, key, modification_time)
+    
     value = latest_get_request_dict.get(key,None)
     if value is None:
         # when there is no value stored for the key, update the value
@@ -19,7 +20,7 @@ def update_latest_modification_time(key:str, modification_time:datetime.datetime
         # when the modification date is more recent than the stored value, update it
         if modification_time > value:
             latest_get_request_dict[key] = modification_time
-    print(f"(update_latest_modification_time INFO): after executing the funtion", latest_get_request_dict, key, modification_time)
+    
     return
 
 def get_latest_modification_time(key:str)->typing.Optional[str]:
@@ -27,8 +28,10 @@ def get_latest_modification_time(key:str)->typing.Optional[str]:
     This function returns the latest modification time in .isoformat, if a datetime is stored for the respective key in {latest_get_request_dict}.
     When there has not yet been an update, this function returns None
     """
+    global latest_get_request_dict
+    
     value = latest_get_request_dict.get(key,None)
     if isinstance(value,datetime.datetime):
         return value.isoformat()
     return value # None
-    
\ No newline at end of file
+    
diff --git a/src/server/BreCal/api/history.py b/src/server/BreCal/api/history.py
index c1fe5ad..4d087a0 100644
--- a/src/server/BreCal/api/history.py
+++ b/src/server/BreCal/api/history.py
@@ -7,7 +7,7 @@ bp = Blueprint('history', __name__)
 
 @bp.route('/history', methods=['get'])
 @auth_guard() # no restriction by role
-def GetParticipant():
+def GetParticipant(): # #TODO: rename? Naming might be a copy-paste typo
 
     if 'Authorization' in request.headers:
         token = request.headers.get('Authorization')
@@ -19,3 +19,13 @@ def GetParticipant():
     else:
         return json.dumps("not authenticated"), 403
 
+
+@bp.route('/getlatesthistory', methods=['get'])
+@auth_guard() # no restriction by role
+def GetLatestHistory():
+
+    if 'Authorization' in request.headers:
+        token = request.headers.get('Authorization')
+        return impl.history.GetLatestHistory(token)
+    else:
+        return json.dumps("not authenticated"), 403
diff --git a/src/server/BreCal/api/notifications.py b/src/server/BreCal/api/notifications.py
index 48a2a44..5a7e434 100644
--- a/src/server/BreCal/api/notifications.py
+++ b/src/server/BreCal/api/notifications.py
@@ -16,4 +16,15 @@ def GetNotifications():
         return impl.notifications.GetNotifications(options)
     else:
         logging.warning("attempt to load notifications without shipcall id")
-        return json.dumps("missing argument"), 400
\ No newline at end of file
+        return json.dumps("missing argument"), 400
+
+@bp.route('/getlatestnotifications', methods=['get'])
+@auth_guard() # no restriction by role
+def GetLatestNotifications():
+
+    if 'Authorization' in request.headers:
+        token = request.headers.get('Authorization')
+        return impl.notifications.GetLatestNotifications(token)
+    else:
+        return json.dumps("not authenticated"), 403
+        
diff --git a/src/server/BreCal/api/participant.py b/src/server/BreCal/api/participant.py
index 65887f9..60d7743 100644
--- a/src/server/BreCal/api/participant.py
+++ b/src/server/BreCal/api/participant.py
@@ -17,3 +17,12 @@ def GetParticipant():
     else:
         return json.dumps("not authenticated"), 403
 
+@bp.route('/getlatestparticipants', methods=['get'])
+@auth_guard() # no restriction by role
+def GetLatestParticipants():
+
+    if 'Authorization' in request.headers:
+        token = request.headers.get('Authorization')
+        return impl.participant.GetLatestParticipants(token)
+    else:
+        return json.dumps("not authenticated"), 403
diff --git a/src/server/BreCal/api/shipcalls.py b/src/server/BreCal/api/shipcalls.py
index 396dc93..1b22dff 100644
--- a/src/server/BreCal/api/shipcalls.py
+++ b/src/server/BreCal/api/shipcalls.py
@@ -53,3 +53,12 @@ def PutShipcalls():
         return json.dumps("bad format"), 400
 
     return impl.shipcalls.PutShipcalls(loadedModel)
+
+@bp.route('/getlatestshipcalls', methods=['get'])
+@auth_guard() # no restriction by role
+def GetLatestShipcalls():
+    if 'Authorization' in request.headers:
+        token = request.headers.get('Authorization')
+        return impl.shipcalls.GetLatestShipcalls(token)
+    else:
+        return json.dumps("not authenticated"), 403
diff --git a/src/server/BreCal/api/ships.py b/src/server/BreCal/api/ships.py
index e31147e..6720a4a 100644
--- a/src/server/BreCal/api/ships.py
+++ b/src/server/BreCal/api/ships.py
@@ -66,3 +66,13 @@ def DeleteShip():
         return json.dumps("bad format"), 400
 
     return impl.ships.DeleteShip(options)
+
+@bp.route('/getlatestships', methods=['get'])
+@auth_guard() # no restriction by role
+def GetLatestShips():
+    if 'Authorization' in request.headers:
+        token = request.headers.get('Authorization')
+        return impl.ships.GetLatestShips(token)
+    else:
+        return json.dumps("not authenticated"), 403
+
diff --git a/src/server/BreCal/api/times.py b/src/server/BreCal/api/times.py
index 2c90397..9e8f30d 100644
--- a/src/server/BreCal/api/times.py
+++ b/src/server/BreCal/api/times.py
@@ -67,3 +67,13 @@ def DeleteTimes():
     else:
         logging.warning("Times delete missing id argument")
         return json.dumps("missing argument"), 400
+
+@bp.route('/getlatesttimes', methods=['get'])
+@auth_guard() # no restriction by role
+def GetLatestTimes():
+
+    if 'Authorization' in request.headers:
+        token = request.headers.get('Authorization')        
+        return impl.times.GetLatestTimes(token)
+    else:
+        return json.dumps("not authenticated"), 403
diff --git a/src/server/BreCal/impl/berths.py b/src/server/BreCal/impl/berths.py
index cc6baf3..d3ab61b 100644
--- a/src/server/BreCal/impl/berths.py
+++ b/src/server/BreCal/impl/berths.py
@@ -34,7 +34,8 @@ def GetBerths(token):
 
 def GetLatestBerths(token):
     """
-    Returns a datetime of the latest modification within the berths database. When there has not yet been a modification, this method returns null.
+    Returns a datetime of the latest modification within the 'berth' database. When there has not yet been a modification, this method returns null.
+    Always creates an output dictionary with the format {key:string, value:str (datetime isoformat)}
     
     # #TODO: should this become a data model?
     """
diff --git a/src/server/BreCal/impl/history.py b/src/server/BreCal/impl/history.py
index 2fa7e1c..f6b99df 100644
--- a/src/server/BreCal/impl/history.py
+++ b/src/server/BreCal/impl/history.py
@@ -7,7 +7,7 @@ from ..schemas import model
 from ..schemas.model import History
 
 from .. import local_db
-from BreCal.api import latest_get_request_dict, update_latest_modification_time
+from BreCal.api import latest_get_request_dict, update_latest_modification_time, get_latest_modification_time
 
 def GetHistory(options):
 
@@ -38,3 +38,25 @@ def GetHistory(options):
 
     return json.dumps(data, default=model.obj_dict), 200, {'Content-Type': 'application/json; charset=utf-8'}
 
+
+def GetLatestHistory(token):
+    """
+    Returns a datetime of the latest modification within the 'history' database. When there has not yet been a modification, this method returns null.
+    Always creates an output dictionary with the format {key:string, value:str (datetime isoformat)}
+    
+    # #TODO: should this become a data model?
+    """
+
+    try:
+        modification_time = get_latest_modification_time(key="history")
+        data = {"key":"history", "value":modification_time}
+        
+        return json.dumps(data), 200, {'Content-Type': 'application/json; charset=utf-8'}
+
+    except Exception as ex:
+        logging.error(ex)
+        print(ex)
+        result = {}
+        result["message"] = "call failed"
+        return json.dumps(result), 500
+
diff --git a/src/server/BreCal/impl/notifications.py b/src/server/BreCal/impl/notifications.py
index 793f4c7..9ca02ca 100644
--- a/src/server/BreCal/impl/notifications.py
+++ b/src/server/BreCal/impl/notifications.py
@@ -4,7 +4,7 @@ import pydapper
 
 from ..schemas import model
 from .. import local_db
-from BreCal.api import latest_get_request_dict, update_latest_modification_time
+from BreCal.api import latest_get_request_dict, update_latest_modification_time, get_latest_modification_time
 
 def GetNotifications(options):
     """
@@ -31,3 +31,25 @@ def GetNotifications(options):
     return json.dumps(data, default=model.obj_dict), 200, {'Content-Type': 'application/json; charset=utf-8'}
 
 
+def GetLatestNotifications(token):
+    """
+    Returns a datetime of the latest modification within the 'notification' database. When there has not yet been a modification, this method returns null.
+    Always creates an output dictionary with the format {key:string, value:str (datetime isoformat)}
+    
+    # #TODO: should this become a data model?
+    """
+
+    try:
+        modification_time = get_latest_modification_time(key="notifications")
+        data = {"key":"notifications", "value":modification_time}
+        
+        return json.dumps(data), 200, {'Content-Type': 'application/json; charset=utf-8'}
+
+    except Exception as ex:
+        logging.error(ex)
+        print(ex)
+        result = {}
+        result["message"] = "call failed"
+        return json.dumps(result), 500
+
+
diff --git a/src/server/BreCal/impl/participant.py b/src/server/BreCal/impl/participant.py
index 174a3f5..2f334a9 100644
--- a/src/server/BreCal/impl/participant.py
+++ b/src/server/BreCal/impl/participant.py
@@ -4,7 +4,7 @@ import pydapper
 
 from ..schemas import model
 from .. import local_db
-from BreCal.api import latest_get_request_dict, update_latest_modification_time
+from BreCal.api import latest_get_request_dict, update_latest_modification_time, get_latest_modification_time
 
 def GetParticipant(options):
     """
@@ -34,3 +34,25 @@ def GetParticipant(options):
         if pooledConnection is not None:
             pooledConnection.close()
 
+
+
+def GetLatestParticipants(token):
+    """
+    Returns a datetime of the latest modification within the 'participant' database. When there has not yet been a modification, this method returns null.
+    Always creates an output dictionary with the format {key:string, value:str (datetime isoformat)}
+    
+    # #TODO: should this become a data model?
+    """
+
+    try:
+        modification_time = get_latest_modification_time(key="participants")
+        data = {"key":"participants", "value":modification_time}
+        
+        return json.dumps(data), 200, {'Content-Type': 'application/json; charset=utf-8'}
+
+    except Exception as ex:
+        logging.error(ex)
+        print(ex)
+        result = {}
+        result["message"] = "call failed"
+        return json.dumps(result), 500
diff --git a/src/server/BreCal/impl/shipcalls.py b/src/server/BreCal/impl/shipcalls.py
index c02c7c4..1577605 100644
--- a/src/server/BreCal/impl/shipcalls.py
+++ b/src/server/BreCal/impl/shipcalls.py
@@ -2,13 +2,14 @@ import json
 import logging
 import traceback
 import pydapper
+import datetime
 
 from ..schemas import model
 from .. import local_db
 from ..services.auth_guard import check_jwt
 
 from BreCal.database.update_database import evaluate_shipcall_state
-from BreCal.api import latest_get_request_dict, update_latest_modification_time
+from BreCal.api import latest_get_request_dict, update_latest_modification_time, get_latest_modification_time
 
 def GetShipcalls(options):
     """
@@ -141,6 +142,9 @@ def PostShipcalls(schemaModel):
         user_data = check_jwt()
         query = "INSERT INTO history (participant_id, shipcall_id, user_id, timestamp, eta, type, operation) VALUES (?pid?, ?scid?, ?uid?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, 1, 1)"
         commands.execute(query, {"scid" : new_id, "pid" : user_data["participant_id"], "uid" : user_data["id"]})
+        
+        # track the latest update in the global dictionary
+        update_latest_modification_time(key="shipcalls",modification_time=datetime.datetime.now()) # new_id
 
         return json.dumps({"id" : new_id}), 201, {'Content-Type': 'application/json; charset=utf-8'}
 
@@ -244,6 +248,9 @@ def PutShipcalls(schemaModel):
         query = "INSERT INTO history (participant_id, shipcall_id, user_id, timestamp, eta, type, operation) VALUES (?pid?, ?scid?, ?uid?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, 1, 2)"
         commands.execute(query, {"scid" : schemaModel["id"], "pid" : user_data["participant_id"], "uid" : user_data["id"]})
 
+        # track the latest update in the global dictionary
+        update_latest_modification_time(key="shipcalls",modification_time=datetime.datetime.now()) # schemaModel["id"]
+
         return json.dumps({"id" : schemaModel["id"]}), 200
 
     except Exception as ex:
@@ -258,3 +265,24 @@ def PutShipcalls(schemaModel):
         if pooledConnection is not None:
             pooledConnection.close()
 
+
+def GetLatestShipcalls(token):
+    """
+    Returns a datetime of the latest modification within the 'shipcall' database. When there has not yet been a modification, this method returns null.
+    Always creates an output dictionary with the format {key:string, value:str (datetime isoformat)}
+    
+    # #TODO: should this become a data model?
+    """
+
+    try:
+        modification_time = get_latest_modification_time(key="shipcalls")
+        data = {"key":"shipcalls", "value":modification_time}
+        
+        return json.dumps(data), 200, {'Content-Type': 'application/json; charset=utf-8'}
+
+    except Exception as ex:
+        logging.error(ex)
+        print(ex)
+        result = {}
+        result["message"] = "call failed"
+        return json.dumps(result), 500
diff --git a/src/server/BreCal/impl/ships.py b/src/server/BreCal/impl/ships.py
index 69964d8..9b2107c 100644
--- a/src/server/BreCal/impl/ships.py
+++ b/src/server/BreCal/impl/ships.py
@@ -5,7 +5,7 @@ import datetime
 
 from ..schemas import model
 from .. import local_db
-from BreCal.api import latest_get_request_dict, update_latest_modification_time
+from BreCal.api import latest_get_request_dict, update_latest_modification_time, get_latest_modification_time
 
 def GetShips(token):
     """
@@ -158,4 +158,25 @@ def DeleteShip(options):
         print(ex)
         result = {}
         result["message"] = "call failed"
-        return json.dumps(result), 500, {'Content-Type': 'application/json; charset=utf-8'}
\ No newline at end of file
+        return json.dumps(result), 500, {'Content-Type': 'application/json; charset=utf-8'}
+        
+def GetLatestShips(token):
+    """
+    Returns a datetime of the latest modification within the 'ship' database. When there has not yet been a modification, this method returns null.
+    Always creates an output dictionary with the format {key:string, value:str (datetime isoformat)}
+    
+    # #TODO: should this become a data model?
+    """
+
+    try:
+        modification_time = get_latest_modification_time(key="ships")
+        data = {"key":"ships", "value":modification_time}
+        
+        return json.dumps(data), 200, {'Content-Type': 'application/json; charset=utf-8'}
+
+    except Exception as ex:
+        logging.error(ex)
+        print(ex)
+        result = {}
+        result["message"] = "call failed"
+        return json.dumps(result), 500
diff --git a/src/server/BreCal/impl/times.py b/src/server/BreCal/impl/times.py
index 966599f..6161313 100644
--- a/src/server/BreCal/impl/times.py
+++ b/src/server/BreCal/impl/times.py
@@ -2,11 +2,12 @@ import json
 import logging
 import traceback
 import pydapper
+import datetime
 
 from ..schemas import model
 from .. import local_db
 from ..services.auth_guard import check_jwt
-from BreCal.api import latest_get_request_dict, update_latest_modification_time
+from BreCal.api import latest_get_request_dict, update_latest_modification_time, get_latest_modification_time
 
 from BreCal.database.update_database import evaluate_shipcall_state
 
@@ -92,6 +93,9 @@ def PostTimes(schemaModel):
         user_data = check_jwt()
         query = "INSERT INTO history (participant_id, shipcall_id, user_id, timestamp, eta, type, operation) VALUES (?pid?, ?scid?, ?uid?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, 2, 1)"
         commands.execute(query, {"scid" : schemaModel["shipcall_id"], "pid" : user_data["participant_id"], "uid" : user_data["id"]})
+        
+        # track the latest update in the global dictionary
+        update_latest_modification_time(key="times", modification_time=datetime.datetime.now()) # new_id
 
         return json.dumps({"id" : new_id}), 201, {'Content-Type': 'application/json; charset=utf-8'}
 
@@ -137,6 +141,7 @@ def PutTimes(schemaModel):
         query += "WHERE id = ?id?"
 
         affected_rows = commands.execute(query, param=schemaModel)
+        new_id = commands.execute_scalar("select last_insert_id()")
 
         # apply 'Traffic Light' evaluation to obtain 'GREEN', 'YELLOW' or 'RED' evaluation state. The function internally updates the mysql database 'shipcall'
         evaluate_shipcall_state(mysql_connector_instance=pooledConnection, shipcall_id=schemaModel["shipcall_id"]) # every times data object refers to the 'shipcall_id'
@@ -152,6 +157,9 @@ def PutTimes(schemaModel):
 
         # if affected_rows == 1: # this doesn't work as expected
 
+        # track the latest update in the global dictionary
+        update_latest_modification_time(key="times", modification_time=datetime.datetime.now()) # new_id
+        
         return json.dumps({"id" : schemaModel["id"]}), 200, {'Content-Type': 'application/json; charset=utf-8'}
 
     except Exception as ex:
@@ -186,6 +194,10 @@ def DeleteTimes(options):
         query = "INSERT INTO history (participant_id, shipcall_id, user_id, timestamp, eta, type, operation) VALUES (?pid?, ?shipcall_id?, ?uid?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, 2, 3)"
         commands.execute(query, {"pid" : user_data["participant_id"], "shipcall_id" : shipcall_id, "uid" : user_data["id"]})
 
+        # track the latest update in the global dictionary
+        ###### could use a query similar to this one: modification_time = commands.execute_scalar("SELECT modified FROM times WHERE id = ?id?", param={"id" : options["id"]}) # clarify: when modified is null, created should be used...
+        update_latest_modification_time(key="times", modification_time=datetime.datetime.now()) # options["id"]
+        
         if affected_rows == 1:
             return json.dumps({"id" : options["id"]}), 200, {'Content-Type': 'application/json; charset=utf-8'}
 
@@ -202,4 +214,25 @@ def DeleteTimes(options):
 
     finally:
         if pooledConnection is not None:
-            pooledConnection.close()
\ No newline at end of file
+            pooledConnection.close()
+            
+def GetLatestTimes(token):
+    """
+    Returns a datetime of the latest modification within the 'times' database. When there has not yet been a modification, this method returns null.
+    Always creates an output dictionary with the format {key:string, value:str (datetime isoformat)}
+    
+    # #TODO: should this become a data model?
+    """
+
+    try:
+        modification_time = get_latest_modification_time(key="times")
+        data = {"key":"times", "value":modification_time}
+        
+        return json.dumps(data), 200, {'Content-Type': 'application/json; charset=utf-8'}
+
+    except Exception as ex:
+        logging.error(ex)
+        print(ex)
+        result = {}
+        result["message"] = "call failed"
+        return json.dumps(result), 500