diff --git a/VERSION b/VERSION
index eea55cf..f60acf7 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.9.17
+1.9.18
diff --git a/changelog.json b/changelog.json
index 3861db5..3378e16 100644
--- a/changelog.json
+++ b/changelog.json
@@ -1,5 +1,18 @@
 {
   "versions": [
+    {
+      "version": "1.9.18",
+      "date": "2026-06-01",
+      "changes": {
+        "features": [],
+        "improvements": [],
+        "fixes": [
+          "OTA update: appel manquant à sqlite/create_db.py dans update_firmware.sh et update_firmware_from_file.sh. Conséquence: les MAJ qui ajoutaient une nouvelle table (data_S88, data_NOISE.noise_status, etc.) laissaient les timers tourner mais chaque écriture échouait silencieusement avec 'no such table'. Désormais create_db.py est appelé en step 2 juste avant set_config.py — idempotent (CREATE IF NOT EXISTS + ALTER ADD COLUMN in try/except), safe à chaque OTA."
+        ],
+        "compatibility": []
+      },
+      "notes": "Fix self-bootstrap: dès qu'un capteur fait une OTA après cette version, create_db.py s'exécute et crée toutes les tables manquantes. Pour les capteurs déjà sur v1.9.13–v1.9.17 qui ont activé S88 sans table data_S88, la prochaine OTA résoudra automatiquement."
+    },
     {
       "version": "1.9.17",
       "date": "2026-06-01",
diff --git a/update_firmware.sh b/update_firmware.sh
index dd8f127..12d083f 100755
--- a/update_firmware.sh
+++ b/update_firmware.sh
@@ -62,9 +62,16 @@ if [ -f "/var/www/nebuleair_pro_4g/VERSION" ]; then
     print_status "Firmware version: $(cat /var/www/nebuleair_pro_4g/VERSION)"
 fi
 
-# Step 2: Update database configuration
+# Step 2: Update database (schema migration + config keys)
+# create_db.py is idempotent (CREATE TABLE IF NOT EXISTS + ALTER TABLE ADD COLUMN
+# wrapped in try/except). Required to add tables introduced after the sensor was
+# initially provisioned (e.g. data_S88, data_NOISE.noise_status, ...).
+# Without this step, OTA updates that add a new sensor table leave the timer running
+# but every write fails with "no such table".
 print_status ""
-print_status "Step 2: Updating database configuration..."
+print_status "Step 2: Updating database (schema migration + config keys)..."
+/usr/bin/python3 /var/www/nebuleair_pro_4g/sqlite/create_db.py
+check_status "Database schema migration"
 /usr/bin/python3 /var/www/nebuleair_pro_4g/sqlite/set_config.py
 check_status "Database configuration update"
 
diff --git a/update_firmware_from_file.sh b/update_firmware_from_file.sh
index 32bd08e..8f6d030 100644
--- a/update_firmware_from_file.sh
+++ b/update_firmware_from_file.sh
@@ -98,9 +98,14 @@ print_status "Fixing ownership..."
 chown -R www-data:www-data "$TARGET_DIR/"
 check_status "Ownership fix (chown)"
 
-# Step 3: Update database configuration
+# Step 3: Update database (schema migration + config keys)
+# create_db.py is idempotent; required to add tables introduced after the sensor
+# was provisioned. Without it, OTA leaves new-sensor timers running but every
+# write fails with "no such table".
 print_status ""
-print_status "Step 3: Updating database configuration..."
+print_status "Step 3: Updating database (schema migration + config keys)..."
+/usr/bin/python3 "$TARGET_DIR/sqlite/create_db.py"
+check_status "Database schema migration"
 /usr/bin/python3 "$TARGET_DIR/sqlite/set_config.py"
 check_status "Database configuration update"