diff --git a/scripts/deploy-prod.sh b/scripts/deploy-prod.sh
index 5e0df19..ff83d12 100755
--- a/scripts/deploy-prod.sh
+++ b/scripts/deploy-prod.sh
@@ -81,8 +81,23 @@ for i in $(seq 1 24); do
   if [ "$ACTUAL" = "$GIT_COMMIT" ]; then
     echo "OK build-info commit=$ACTUAL"
     if docker ps --format '{{.Names}}' | grep -q "^memento-grafana$"; then
-      echo "=== Recreating Grafana and Prometheus to load new configurations ==="
-      docker compose -f monitoring/docker-compose.monitoring.yml up -d --force-recreate grafana prometheus
+      # Ne recréer Prometheus que si sa config a changé (préserve l'historique TSDB)
+      PROM_CHANGED=$(git diff --name-only HEAD~1 HEAD 2>/dev/null | grep -E '^monitoring/(prometheus\.yml|alerts\.yml)' || true)
+      GRAFANA_CHANGED=$(git diff --name-only HEAD~1 HEAD 2>/dev/null | grep -E '^monitoring/' || true)
+      if [ -n "$PROM_CHANGED" ]; then
+        echo "=== Prometheus config changed — recreating ==="
+        docker compose -f monitoring/docker-compose.monitoring.yml up -d --force-recreate prometheus
+      else
+        echo "=== Prometheus config unchanged — keeping TSDB history ==="
+        docker compose -f monitoring/docker-compose.monitoring.yml up -d prometheus
+      fi
+      if [ -n "$GRAFANA_CHANGED" ]; then
+        echo "=== Grafana config changed — recreating ==="
+        docker compose -f monitoring/docker-compose.monitoring.yml up -d --force-recreate grafana
+      else
+        echo "=== Grafana config unchanged — keeping state ==="
+        docker compose -f monitoring/docker-compose.monitoring.yml up -d grafana
+      fi
     fi
     docker compose ps
     exit 0