diff --git a/RTC/save_to_db.py b/RTC/save_to_db.py
index 19e8c58..ee99354 100755
--- a/RTC/save_to_db.py
+++ b/RTC/save_to_db.py
@@ -1,45 +1,15 @@
 '''
-  ____ _____ ____ 
+  ____ _____ ____
  |  _ \_   _/ ___|
- | |_) || || |    
- |  _ < | || |___ 
+ | |_) || || |
+ |  _ < | || |___
  |_| \_\|_| \____|
-                  
+
 Script to read time from RTC module and save it to DB
-I2C connection
-Address 0x68
-/usr/bin/python3 /var/www/nebuleair_pro_4g/RTC/save_to_db.py
-
-This need to be run as a system service
-
---> sudo nano /etc/systemd/system/rtc_save_to_db.service
-
-⬇️
-[Unit]
-Description=RTC Save to DB Script
-After=network.target
-
-[Service]
-ExecStart=/usr/bin/python3 /var/www/nebuleair_pro_4g/RTC/save_to_db.py
-Restart=always
-RestartSec=1
-User=root
-WorkingDirectory=/var/www/nebuleair_pro_4g
-StandardOutput=append:/var/www/nebuleair_pro_4g/logs/rtc_save_to_db.log
-StandardError=append:/var/www/nebuleair_pro_4g/logs/rtc_save_to_db_errors.log
-
-[Install]
-WantedBy=multi-user.target
-⬆️
-
-
-sudo systemctl daemon-reload
-sudo systemctl enable rtc_save_to_db.service
-
-sudo systemctl start rtc_save_to_db.service
-
-sudo systemctl status rtc_save_to_db.service
+I2C connection - Address 0x68
 
+Runs as a long-running systemd service (rtc_save_to_db.service).
+The service file is created by services/setup_services.sh — single source of truth.
 '''
 import smbus2
 import time
diff --git a/VERSION b/VERSION
index 661e7ae..10c0880 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.7.3
+1.7.4
diff --git a/changelog.json b/changelog.json
index e553461..60845a2 100644
--- a/changelog.json
+++ b/changelog.json
@@ -1,5 +1,26 @@
 {
   "versions": [
+    {
+      "version": "1.7.4",
+      "date": "2026-05-12",
+      "changes": {
+        "features": [],
+        "improvements": [
+          "Services systemd: source de verite unique dans services/setup_services.sh (le service rtc_save_to_db etait auparavant cree inline dans installation_part2.sh)",
+          "update_firmware.sh: appelle maintenant setup_services.sh apres git pull (self-healing des services manquants/masques sur les capteurs deja deployes)",
+          "setup_services.sh: systemctl unmask defensif sur rtc_save_to_db avant creation du fichier (evite l'ecriture dans /dev/null si le service avait ete masque)"
+        ],
+        "fixes": [
+          "Bug observe sur capteur deployé: rtc_save_to_db.service masque -> timestamp_table reste a 'not connected' -> RTC affiche comme non connecte dans les logs SARA alors que le materiel fonctionne. L'update firmware ne reparait pas cette situation. Avec v1.7.4, un simple update firmware repare automatiquement."
+        ],
+        "compatibility": [
+          "Aucun risque sur les capteurs sains: les fichiers .service sont reecrits avec le meme contenu, comportement inchange",
+          "Capteurs avec services manquants/masques: seront repares automatiquement au prochain update firmware",
+          "Aucune migration manuelle requise"
+        ]
+      },
+      "notes": "Reorganisation interne du provisionnement des services systemd. installation_part2.sh ne contient plus la definition inline du service RTC (deduplique). save_to_db.py ne contient plus les instructions systemd en commentaire (deduplique). update_firmware.sh devient self-healing pour les services."
+    },
     {
       "version": "1.7.3",
       "date": "2026-05-12",
diff --git a/installation_part2.sh b/installation_part2.sh
index 2153f56..20cb236 100644
--- a/installation_part2.sh
+++ b/installation_part2.sh
@@ -72,13 +72,10 @@ imsi_number=$(echo "$imsi_output" | grep -oP '^\d{15}$' || echo "N/A")
 #info "Connect SARA R4 to network"
 #python3 /var/www/nebuleair_pro_4g/SARA/sara_connectNetwork.py ttyAMA2 20810 60
 
-#Need to create the two service
-# 1. start the scripts to set-up the services
-# 2. rtc_save_to_db
-
-#1. set-up the services (SARA, NPM, BME280, etc)
+# Set up all systemd services (SARA, NPM, BME280, RTC save_to_db, etc.)
+# Single source of truth: services/setup_services.sh
 info "Setting up systemd services..."
-    
+
 if [[ -f "$REPO_DIR/services/setup_services.sh" ]]; then
     sudo chmod +x "$REPO_DIR/services/setup_services.sh"
     sudo "$REPO_DIR/services/setup_services.sh" || warning "Failed to set up systemd services"
@@ -87,43 +84,6 @@ else
     warning "Systemd services setup script not found."
 fi
 
-#2. Add rtc_save_to_db.service
-SERVICE_FILE_2="/etc/systemd/system/rtc_save_to_db.service"
-info "Setting up systemd service for rtc_save_to_db..."
-
-# Create the systemd service file (overwrite if necessary)
-sudo bash -c "cat > $SERVICE_FILE_2" <<EOF
-[Unit]
-Description=RTC Save to DB Script
-After=network.target
-
-[Service]
-ExecStart=/usr/bin/python3 /var/www/nebuleair_pro_4g/RTC/save_to_db.py
-Restart=always
-RestartSec=1
-User=root
-WorkingDirectory=/var/www/nebuleair_pro_4g
-StandardOutput=append:/var/www/nebuleair_pro_4g/logs/rtc_save_to_db.log
-StandardError=append:/var/www/nebuleair_pro_4g/logs/rtc_save_to_db_errors.log
-
-[Install]
-WantedBy=multi-user.target
-EOF
-
-success "Systemd service file created: $SERVICE_FILE_2"
-
-# Reload systemd to recognize the new service
-info "Reloading systemd daemon..."
-sudo systemctl daemon-reload
-
-# Enable the service to start on boot
-info "Enabling the service to start on boot..."
-sudo systemctl enable rtc_save_to_db.service
-
-# Start the service immediately
-info "Starting the service..."
-sudo systemctl start rtc_save_to_db.service
-
 # Display device information
 echo ""
 echo "=========================================="
diff --git a/services/setup_services.sh b/services/setup_services.sh
index fb59f13..078de20 100644
--- a/services/setup_services.sh
+++ b/services/setup_services.sh
@@ -321,6 +321,28 @@ RemainAfterExit=yes
 WantedBy=multi-user.target
 EOL
 
+# Create service file for RTC Save to DB (long-running service, no timer)
+# Unmask first in case it was previously masked (symlink to /dev/null)
+# so the cat below writes a real file, not into /dev/null.
+systemctl unmask rtc_save_to_db.service 2>/dev/null || true
+cat > /etc/systemd/system/rtc_save_to_db.service << 'EOL'
+[Unit]
+Description=RTC Save to DB Script
+After=network.target
+
+[Service]
+ExecStart=/usr/bin/python3 /var/www/nebuleair_pro_4g/RTC/save_to_db.py
+Restart=always
+RestartSec=1
+User=root
+WorkingDirectory=/var/www/nebuleair_pro_4g
+StandardOutput=append:/var/www/nebuleair_pro_4g/logs/rtc_save_to_db.log
+StandardError=append:/var/www/nebuleair_pro_4g/logs/rtc_save_to_db_errors.log
+
+[Install]
+WantedBy=multi-user.target
+EOL
+
 # Reload systemd to recognize new services
 systemctl daemon-reload
 
@@ -342,6 +364,13 @@ systemctl enable nebuleair-cpu-power.service
 systemctl start nebuleair-cpu-power.service
 echo "Started nebuleair-cpu-power service"
 
+# Enable and start RTC Save to DB service (long-running, no timer)
+# Use restart instead of start to pick up new content if the service was
+# already running with an older version of the file.
+systemctl enable rtc_save_to_db.service
+systemctl restart rtc_save_to_db.service
+echo "Started rtc_save_to_db service"
+
 echo "Checking status of all timers..."
 systemctl list-timers | grep nebuleair
 
diff --git a/update_firmware.sh b/update_firmware.sh
index 658ea6f..6cf2a35 100755
--- a/update_firmware.sh
+++ b/update_firmware.sh
@@ -107,6 +107,20 @@ if [ "${APACHE_CHANGED:-false}" = true ]; then
     print_status "✓ Apache reloaded"
 fi
 
+# Step 3c: Reconcile systemd services with the repo (self-heal)
+# Re-running setup_services.sh ensures any service that was removed,
+# masked, or never installed gets recreated from the canonical source.
+# Idempotent: rewriting an existing service file with the same content
+# is a no-op for already-running services.
+print_status ""
+print_status "Step 3c: Reconciling systemd services with setup_services.sh..."
+if [ -x /var/www/nebuleair_pro_4g/services/setup_services.sh ]; then
+    sudo /var/www/nebuleair_pro_4g/services/setup_services.sh
+    check_status "Setup services reconciliation"
+else
+    print_status "⚠ setup_services.sh not found or not executable, skipping"
+fi
+
 # Step 4: Restart critical services if they exist
 print_status ""
 print_status "Step 4: Managing system services..."