Improve how the application starts to ensure environment variables are loaded correctly

Modify deployment/check_frontend.sh to use `env $(cat .env | grep -v '^#' | xargs) npm run dev` to inject environment variables into the npm process, resolving issues where `nohup` did not inherit exported variables. Update replit.md to reflect the corrected fix details.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 7a657272-55ba-4a79-9a2e-f1ed9bc7a528
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 602cd9af-422f-4b1d-ab37-5fd3e0bd016f
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/449cf7c4-c97a-45ae-8234-e5c5b8d6a84f/7a657272-55ba-4a79-9a2e-f1ed9bc7a528/dI1I79r

attached_assets/Pasted-cat-opt-ids-env-grep-DATABASE-URL-DATABASE-URL-postgresql-ids-user-TestPassword123-127-0-0-1-5-1763740601496_1763740601496.txt

@@ -0,0 +1,132 @@
+cat /opt/ids/.env | grep DATABASE_URL
+DATABASE_URL=postgresql://ids_user:TestPassword123@127.0.0.1:5432/ids_database
+[root@ids ids]# psql "$(grep DATABASE_URL /opt/ids/.env | cut -d= -f2)"
+psql (13.22)
+Type "help" for help.
+
+ids_database=>
+ABORT                      CLUSTER                    DELETE FROM                FETCH                      MOVE                       RESET                      SHOW                       VALUES
+ALTER                      COMMENT                    DISCARD                    GRANT                      NOTIFY                     REVOKE                     START                      WITH
+ANALYZE                    COMMIT                     DO                         IMPORT                     PREPARE                    ROLLBACK                   TABLE
+BEGIN                      COPY                       DROP                       INSERT                     REASSIGN                   SAVEPOINT                  TRUNCATE
+CALL                       CREATE                     END                        LISTEN                     REFRESH MATERIALIZED VIEW  SECURITY LABEL             UNLISTEN
+CHECKPOINT                 DEALLOCATE                 EXECUTE                    LOAD                       REINDEX                    SELECT                     UPDATE
+CLOSE                      DECLARE                    EXPLAIN                    LOCK                       RELEASE                    SET                        VACUUM
+ids_database=> close
+ids_database-> ^Z
+[3]+  Stopped                 psql "$(grep DATABASE_URL /opt/ids/.env | cut -d= -f2)"
+[root@ids ids]# nano .env
+[root@ids ids]# psql "$(grep DATABASE_URL /opt/ids/.env | cut -d= -f2)"
+psql (13.22)
+Type "help" for help.
+
+ids_database=> ^Z
+[4]+  Stopped                 psql "$(grep DATABASE_URL /opt/ids/.env | cut -d= -f2)"
+[root@ids ids]# tail -100 /var/log/ids/frontend.log
+4:46:58 PM [express] serving on port 5000
+
+A PostCSS plugin did not pass the `from` option to `postcss.parse`. This may cause imported assets to be incorrectly transformed. If you've recently added a PostCSS plugin that raised this warning, please contact the package author to fix the issue.
+4:49:03 PM [express] GET /api/stats 500 in 39ms :: {"error":"Failed to fetch stats"}
+4:49:03 PM [express] GET /api/detections 500 in 13ms :: {"error":"Failed to fetch detections"}
+4:49:03 PM [express] GET /api/routers 500 in 11ms :: {"error":"Failed to fetch routers"}
+4:49:06 PM [express] GET /api/stats 500 in 11ms :: {"error":"Failed to fetch stats"}
+4:49:06 PM [express] GET /api/detections 500 in 8ms :: {"error":"Failed to fetch detections"}
+4:49:06 PM [express] GET /api/routers 500 in 6ms :: {"error":"Failed to fetch routers"}
+4:49:08 PM [express] GET /api/detections 500 in 4ms :: {"error":"Failed to fetch detections"}
+4:49:10 PM [express] GET /api/training-history 500 in 42ms :: {"error":"Failed to fetch training his…
+4:49:10 PM [express] GET /api/ml/stats 200 in 70ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:49:15 PM [express] POST /api/ml/train 200 in 10ms :: {"message":"Training avviato in background","…
+4:49:15 PM [express] GET /api/training-history 500 in 6ms :: {"error":"Failed to fetch training hist…
+4:49:15 PM [express] GET /api/ml/stats 200 in 14ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:49:21 PM [express] GET /api/training-history 500 in 7ms :: {"error":"Failed to fetch training hist…
+4:49:21 PM [express] GET /api/ml/stats 200 in 20ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:49:27 PM [express] GET /api/training-history 500 in 6ms :: {"error":"Failed to fetch training hist…
+4:49:27 PM [express] GET /api/ml/stats 200 in 20ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:49:31 PM [express] GET /api/training-history 500 in 5ms :: {"error":"Failed to fetch training hist…
+4:49:31 PM [express] GET /api/ml/stats 200 in 15ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:49:33 PM [express] GET /api/routers 500 in 5ms :: {"error":"Failed to fetch routers"}
+4:49:36 PM [express] GET /api/whitelist 500 in 4ms :: {"error":"Failed to fetch whitelist"}
+4:49:38 PM [express] GET /api/routers 500 in 4ms :: {"error":"Failed to fetch routers"}
+4:49:39 PM [express] GET /api/training-history 500 in 7ms :: {"error":"Failed to fetch training hist…
+4:49:39 PM [express] GET /api/ml/stats 200 in 20ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:49:41 PM [express] GET /api/detections 500 in 4ms :: {"error":"Failed to fetch detections"}
+4:49:42 PM [express] GET /api/stats 500 in 4ms :: {"error":"Failed to fetch stats"}
+4:49:43 PM [express] GET /api/detections 500 in 6ms :: {"error":"Failed to fetch detections"}
+4:49:43 PM [express] GET /api/routers 500 in 4ms :: {"error":"Failed to fetch routers"}
+4:49:44 PM [express] GET /api/training-history 500 in 5ms :: {"error":"Failed to fetch training hist…
+4:49:44 PM [express] GET /api/ml/stats 200 in 19ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:49:54 PM [express] GET /api/training-history 500 in 8ms :: {"error":"Failed to fetch training hist…
+4:49:54 PM [express] GET /api/ml/stats 304 in 20ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:49:57 PM [express] GET /api/detections 500 in 4ms :: {"error":"Failed to fetch detections"}
+4:49:59 PM [express] GET /api/training-history 500 in 5ms :: {"error":"Failed to fetch training hist…
+4:49:59 PM [express] GET /api/ml/stats 304 in 19ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:50:00 PM [express] GET /api/routers 500 in 3ms :: {"error":"Failed to fetch routers"}
+4:50:01 PM [express] GET /api/whitelist 500 in 4ms :: {"error":"Failed to fetch whitelist"}
+4:50:02 PM [express] GET /api/training-history 500 in 6ms :: {"error":"Failed to fetch training hist…
+4:50:02 PM [express] GET /api/ml/stats 304 in 17ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:50:12 PM [express] GET /api/training-history 500 in 5ms :: {"error":"Failed to fetch training hist…
+4:50:12 PM [express] GET /api/ml/stats 304 in 18ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:50:22 PM [express] GET /api/training-history 500 in 4ms :: {"error":"Failed to fetch training hist…
+4:50:22 PM [express] GET /api/ml/stats 304 in 17ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:50:32 PM [express] GET /api/training-history 500 in 3ms :: {"error":"Failed to fetch training hist…
+4:50:33 PM [express] GET /api/ml/stats 304 in 17ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:50:42 PM [express] GET /api/training-history 500 in 3ms :: {"error":"Failed to fetch training hist…
+4:50:43 PM [express] GET /api/ml/stats 304 in 17ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:50:52 PM [express] GET /api/training-history 500 in 5ms :: {"error":"Failed to fetch training hist…
+4:50:53 PM [express] GET /api/ml/stats 304 in 17ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:51:02 PM [express] GET /api/training-history 500 in 4ms :: {"error":"Failed to fetch training hist…
+4:51:03 PM [express] GET /api/ml/stats 304 in 16ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:51:12 PM [express] GET /api/training-history 500 in 3ms :: {"error":"Failed to fetch training hist…
+4:51:13 PM [express] GET /api/ml/stats 304 in 17ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:51:23 PM [express] GET /api/training-history 500 in 4ms :: {"error":"Failed to fetch training hist…
+4:51:23 PM [express] GET /api/ml/stats 304 in 17ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:51:33 PM [express] GET /api/training-history 500 in 3ms :: {"error":"Failed to fetch training hist…
+4:51:33 PM [express] GET /api/ml/stats 304 in 17ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:51:37 PM [express] GET /api/detections 500 in 4ms :: {"error":"Failed to fetch detections"}
+4:51:39 PM [express] GET /api/training-history 500 in 3ms :: {"error":"Failed to fetch training hist…
+4:51:39 PM [express] GET /api/ml/stats 304 in 16ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:51:40 PM [express] GET /api/routers 500 in 4ms :: {"error":"Failed to fetch routers"}
+4:51:42 PM [express] GET /api/whitelist 500 in 4ms :: {"error":"Failed to fetch whitelist"}
+4:51:43 PM [express] GET /api/training-history 500 in 7ms :: {"error":"Failed to fetch training hist…
+4:51:43 PM [express] GET /api/ml/stats 304 in 16ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:51:53 PM [express] GET /api/training-history 500 in 5ms :: {"error":"Failed to fetch training hist…
+4:51:53 PM [express] GET /api/ml/stats 304 in 18ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:52:03 PM [express] GET /api/training-history 500 in 3ms :: {"error":"Failed to fetch training hist…
+4:52:03 PM [express] GET /api/ml/stats 304 in 17ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:52:13 PM [express] GET /api/training-history 500 in 4ms :: {"error":"Failed to fetch training hist…
+4:52:13 PM [express] GET /api/ml/stats 304 in 18ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:52:23 PM [express] GET /api/training-history 500 in 4ms :: {"error":"Failed to fetch training hist…
+4:52:23 PM [express] GET /api/ml/stats 304 in 16ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:52:33 PM [express] GET /api/training-history 500 in 4ms :: {"error":"Failed to fetch training hist…
+4:52:33 PM [express] GET /api/ml/stats 304 in 15ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:52:43 PM [express] GET /api/training-history 500 in 4ms :: {"error":"Failed to fetch training hist…
+4:52:43 PM [express] GET /api/ml/stats 304 in 15ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:52:53 PM [express] GET /api/training-history 500 in 5ms :: {"error":"Failed to fetch training hist…
+4:52:53 PM [express] GET /api/ml/stats 304 in 16ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:53:03 PM [express] GET /api/training-history 500 in 3ms :: {"error":"Failed to fetch training hist…
+4:53:03 PM [express] GET /api/ml/stats 304 in 16ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:53:13 PM [express] GET /api/training-history 500 in 3ms :: {"error":"Failed to fetch training hist…
+4:53:13 PM [express] GET /api/ml/stats 304 in 16ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:53:23 PM [express] GET /api/training-history 500 in 3ms :: {"error":"Failed to fetch training hist…
+4:53:23 PM [express] GET /api/ml/stats 304 in 16ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:53:33 PM [express] GET /api/training-history 500 in 3ms :: {"error":"Failed to fetch training hist…
+4:53:33 PM [express] GET /api/ml/stats 304 in 19ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:53:43 PM [express] GET /api/training-history 500 in 4ms :: {"error":"Failed to fetch training hist…
+4:53:43 PM [express] GET /api/ml/stats 304 in 18ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:53:53 PM [express] GET /api/training-history 500 in 4ms :: {"error":"Failed to fetch training hist…
+4:53:53 PM [express] GET /api/ml/stats 304 in 17ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:54:03 PM [express] GET /api/training-history 500 in 3ms :: {"error":"Failed to fetch training hist…
+4:54:03 PM [express] GET /api/ml/stats 304 in 15ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:54:13 PM [express] GET /api/training-history 500 in 4ms :: {"error":"Failed to fetch training hist…
+4:54:13 PM [express] GET /api/ml/stats 304 in 16ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:54:23 PM [express] GET /api/training-history 500 in 3ms :: {"error":"Failed to fetch training hist…
+4:54:23 PM [express] GET /api/ml/stats 304 in 20ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+4:54:33 PM [express] GET /api/training-history 500 in 4ms :: {"error":"Failed to fetch training hist…
+4:54:33 PM [express] GET /api/ml/stats 304 in 16ms :: {"logs":{"total":0,"last_hour":0},"detections"…
+[root@ids ids]# psql -h 127.0.0.1 -U ids_user -d ids_database
+Password for user ids_user:
+psql (13.22)
+Type "help" for help.
+
+ids_database=> ^Z
+[5]+  Stopped                 psql -h 127.0.0.1 -U ids_user -d ids_database

deployment/check_frontend.sh

@@ -25,14 +25,15 @@ else
     # Wait a moment
     sleep 2
     
-    # Load environment variables from .env file
+    # Start frontend with environment variables from .env
-    set -a
-    source "$WORK_DIR/.env" 2>/dev/null || true
-    set +a
-    
-    # Start frontend
     cd "$WORK_DIR"
+    if [ -f "$WORK_DIR/.env" ]; then
+        # Load .env and start npm with those variables
+        nohup env $(cat "$WORK_DIR/.env" | grep -v '^#' | xargs) npm run dev >> "$LOG_FILE" 2>&1 &
+    else
+        # Fallback: start without .env (will use system env vars)
         nohup npm run dev >> "$LOG_FILE" 2>&1 &
+    fi
     NEW_PID=$!
     echo $NEW_PID > "$PID_FILE"
     

replit.md

@@ -43,12 +43,13 @@ Sistema di rilevamento intrusioni per router MikroTik basato su Machine Learning
 
 ## Fix Recenti (Novembre 2025)
 
-### ✅ Frontend Environment Variables Fix (21 Nov 2025 - 16:30)
+### ✅ Frontend Environment Variables Fix (21 Nov 2025 - 17:00)
 - **Problema**: Frontend Node.js non si avviava su server AlmaLinux con errore `DATABASE_URL must be set`
-- **Causa**: Script `check_frontend.sh` non caricava variabili d'ambiente dal file `.env`
+- **Causa 1**: Script `check_frontend.sh` non caricava variabili d'ambiente dal file `.env`
+- **Causa 2**: Il comando `nohup` crea un nuovo processo che non eredita variabili esportate con `source`
 - **Soluzione**: 
-  - Modificato `deployment/check_frontend.sh` per caricare `.env` prima di eseguire `npm run dev`
+  - Modificato `deployment/check_frontend.sh` per passare variabili direttamente al comando npm
-  - Usato `set -a; source .env; set +a` per esportare tutte le variabili
+  - Usato `env $(cat .env | grep -v '^#' | xargs) npm run dev` per iniettare variabili nel processo
 - **Risultato**: Frontend si avvia correttamente leggendo `DATABASE_URL` e altre variabili da `.env`
 
 ### ✅ Form Validation Migliorata (21 Nov 2025 - 15:00)