diff --git a/.env b/.env
index 7ac7cf6a..c75c843a 100644
--- a/.env
+++ b/.env
@@ -2,5 +2,9 @@
 APP_DATA_LOCATION=/path/to/docker_appdata
 APP_CONFIG_LOCATION=/path/to/docker_config
 LOGS_LOCATION=/path/to/docker_logs
+TZ=Europe/Paris
+HOST_USER_ID=1000
+HOST_USER_GID=1000
+PORT=20211
 
 
diff --git a/README.md b/README.md
index d5d95bde..a495bf29 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ JavaScript)*
 📚 [Dockerfile instructions](https://github.com/jokob-sk/Pi.Alert/blob/main//dockerfiles/README.md).
 
 ![Main screen dark][main_dark]
-Dark mode (and Activity over the last x scans) within this fork courtesy of [leiweibau](https://github.com/leiweibau/Pi.Alert)
+Dark mode (and Device presence over time) within this fork courtesy of [leiweibau](https://github.com/leiweibau/Pi.Alert)
 
 ## How it works
 The system continuously scans the network for:
@@ -164,7 +164,7 @@ Linux distributions.
 
   This code is a collaborative body of work, with special thanks to: 
 
-   - [leiweibau](https://github.com/leiweibau/Pi.Alert): Dark mode (and Last X scans activity chart)
+   - [leiweibau](https://github.com/leiweibau/Pi.Alert): Dark mode (and Device presence over time)
    - [Macleykun](https://github.com/Macleykun): Help with Dockerfile clean-up
    - [Final-Hawk](https://github.com/Final-Hawk): Help with NTFY, styling and other fixes
    - Please see the [Git commit history](https://github.com/jokob-sk/Pi.Alert/commits/main) for a full list of people and their contributions to the project
diff --git a/back/pialert.py b/back/pialert.py
index 3cc7c5bb..268aa023 100644
--- a/back/pialert.py
+++ b/back/pialert.py
@@ -1480,17 +1480,31 @@ def send_email (pText, pHTML):
 #===============================================================================
 # DB
 #===============================================================================
-def upgradeDB ():
+def upgradeDB (): 
 
     openDB()
 
-    # check if table exists    
-    listOfTables = sql.execute(
-      """SELECT name FROM sqlite_master WHERE type='table'
-      AND name='Online_History'; """).fetchall()
+    # indicates, if Online_History table is available 
+    onlineHistoryAvailable = sql.execute("""
+    SELECT name FROM sqlite_master WHERE type='table'
+    AND name='Online_History'; 
+    """).fetchall() != []
+
+    # Check if it is incompatible (Check if table has all required columns)
+    isIncompatible = False
     
-    if listOfTables == []:
-      print_log ('Upgrading DB (creating Online_History table)')
+    if onlineHistoryAvailable :
+      isIncompatible = sql.execute ("""
+      SELECT COUNT(*) AS CNTREC FROM pragma_table_info('Online_History') WHERE name='Archived_Devices'
+      """).fetchone()[0] == 0
+    
+    # Drop table if available, but incompatible
+    if onlineHistoryAvailable and isIncompatible:
+      print_log ('Table is incompatible, Dropping the Online_History table)')
+      sql.execute("DROP TABLE Online_History;")
+      onlineHistoryAvailable = False
+
+    if onlineHistoryAvailable == False :
       sql.execute("""      
       CREATE TABLE "Online_History" (
         "Index"	INTEGER,
@@ -1503,6 +1517,7 @@ def upgradeDB ():
       );      
       """)
 
+
 #-------------------------------------------------------------------------------
 
 def openDB ():
diff --git a/docker-compose.yml b/docker-compose.yml
index f629723b..b1ec288d 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -10,7 +10,7 @@ services:
       - ${APP_DATA_LOCATION}/pialert/db/pialert.db:/home/pi/pialert/db/pialert.db
       - ${LOGS_LOCATION}/tmp:/home/pi/pialert/log
     environment:
-      - TZ=Europe/London
-      - PORT=20211
-      - HOST_USER_ID=1000
-      - HOST_USER_GID=1000
+      - TZ=${TZ}
+      - PORT=${PORT}
+      - HOST_USER_ID=${HOST_USER_ID}
+      - HOST_USER_GID=${HOST_USER_GID}
diff --git a/front/devices.php b/front/devices.php
index 3e8563d4..91b2326d 100644
--- a/front/devices.php
+++ b/front/devices.php
@@ -106,7 +106,7 @@
           <div class="col-md-12">
           <div class="box" id="clients">
               <div class="box-header with-border">
-                <h3 class="box-title"><?php echo $pia_lang['Device_Shortcut_OnlineChart_a'];?>  <span class="maxlogage-interval">12</span> <?php echo $pia_lang['Device_Shortcut_OnlineChart_b'];?></h3>
+                <h3 class="box-title"><?php echo $pia_lang['Device_Shortcut_OnlineChart'];?> </h3>
               </div>
               <div class="box-body">
                 <div class="chart">
diff --git a/front/php/templates/language/de_de.php b/front/php/templates/language/de_de.php
index 9d613253..a7dafeaa 100644
--- a/front/php/templates/language/de_de.php
+++ b/front/php/templates/language/de_de.php
@@ -15,8 +15,7 @@ $pia_lang['Device_Shortcut_NewDevices'] = 'Neue Geräte';
 $pia_lang['Device_Shortcut_DownAlerts'] = 'Down Meldungen';
 $pia_lang['Device_Shortcut_Archived'] = 'Archiviert';
 $pia_lang['Device_Shortcut_Devices'] = 'Geräte';
-$pia_lang['Device_Shortcut_OnlineChart_a'] = 'Netzwerkaktivität über die letzten';
-$pia_lang['Device_Shortcut_OnlineChart_b'] = 'Stunden';
+$pia_lang['Device_Shortcut_OnlineChart'] = 'Gerätepräsenz im Laufe der Zeit';
 $pia_lang['Device_TableHead_Name'] = 'Name';
 $pia_lang['Device_TableHead_Owner'] = 'Eigentümer';
 $pia_lang['Device_TableHead_Type'] = 'Typ';
diff --git a/front/php/templates/language/en_us.php b/front/php/templates/language/en_us.php
index 3a98ebc8..046eb4c5 100644
--- a/front/php/templates/language/en_us.php
+++ b/front/php/templates/language/en_us.php
@@ -15,8 +15,7 @@ $pia_lang['Device_Shortcut_NewDevices'] = 'New Devices';
 $pia_lang['Device_Shortcut_DownAlerts'] = 'Down Alerts';
 $pia_lang['Device_Shortcut_Archived'] = 'Archived';
 $pia_lang['Device_Shortcut_Devices'] = 'Devices';
-$pia_lang['Device_Shortcut_OnlineChart_a'] = 'Network activity over last';
-$pia_lang['Device_Shortcut_OnlineChart_b'] = 'hours';
+$pia_lang['Device_Shortcut_OnlineChart'] = 'Device presence over time';
 $pia_lang['Device_TableHead_Name'] = 'Name';
 $pia_lang['Device_TableHead_Owner'] = 'Owner';
 $pia_lang['Device_TableHead_Type'] = 'Type';
diff --git a/front/php/templates/language/es_es.php b/front/php/templates/language/es_es.php
index 59615751..4c7c7419 100644
--- a/front/php/templates/language/es_es.php
+++ b/front/php/templates/language/es_es.php
@@ -15,8 +15,7 @@ $pia_lang['Device_Shortcut_NewDevices'] = 'Nuevos dispositivos';
 $pia_lang['Device_Shortcut_DownAlerts'] = 'Alertas de caídas';
 $pia_lang['Device_Shortcut_Archived'] = 'Archivada';
 $pia_lang['Device_Shortcut_Devices'] = 'Dispositivos';
-$pia_lang['Device_Shortcut_OnlineChart_a'] = 'Actividad de la red durante el último';
-$pia_lang['Device_Shortcut_OnlineChart_b'] = 'horas';
+$pia_lang['Device_Shortcut_OnlineChart'] = 'Presencia del dispositivo a lo largo del tiempo';
 $pia_lang['Device_TableHead_Name'] = 'Nombre';
 $pia_lang['Device_TableHead_Owner'] = 'Propietario';
 $pia_lang['Device_TableHead_Type'] = 'Tipo';
diff --git a/front/presence.php b/front/presence.php
index 5ab20310..e90ed99c 100644
--- a/front/presence.php
+++ b/front/presence.php
@@ -106,7 +106,7 @@
           <div class="col-md-12">
           <div class="box" id="clients">
               <div class="box-header with-border">
-                <h3 class="box-title"><?php echo $pia_lang['Device_Shortcut_OnlineChart_a'];?>  <span class="maxlogage-interval">12</span> <?php echo $pia_lang['Device_Shortcut_OnlineChart_b'];?></h3>
+                <h3 class="box-title"><?php echo $pia_lang['Device_Shortcut_OnlineChart'];?></h3>
               </div>
               <div class="box-body">
                 <div class="chart">