diff --git a/sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/sync/ProductSyncService.java b/sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/sync/ProductSyncService.java
index 33deaae..94e07b9 100644
--- a/sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/sync/ProductSyncService.java
+++ b/sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/sync/ProductSyncService.java
@@ -94,34 +94,37 @@ public class ProductSyncService {
 
     private void pushProduct(DolibarrProductDto dolProduct) {
         String sku = dolProduct.ref();
-        Optional<ProductMapping> existing = productMappingRepository.findBySku(sku);
 
-        if (existing.isEmpty()) {
+        // PS is source of truth: local mapping may be stale if PS products were deleted
+        Optional<PrestashopProductDto> existingPs = prestashopClient.getProductByReference(sku);
+
+        if (existingPs.isPresent()) {
+            Integer psId = existingPs.get().id();
+            prestashopClient.updateProduct(psId, toPrestashopDto(dolProduct, psId));
+            upsertMapping(sku, dolProduct.id(), psId);
+            log.debug("ProductSync: updated PS product reference={} id={}", sku, psId);
+        } else {
             PrestashopProductDto created = prestashopClient.createProduct(toPrestashopDto(dolProduct, null));
             if (created == null) {
                 throw new PrestashopApiException(
                         "Product created in PS but not found via GET (reference=" + sku + ")");
             }
-            productMappingRepository.save(ProductMapping.builder()
-                    .sku(sku)
-                    .dolibarrId(dolProduct.id())
-                    .prestashopId(created.id())
-                    .lastSyncedAt(Instant.now())
-                    .syncStatus(SyncStatus.SYNCED)
-                    .build());
+            upsertMapping(sku, dolProduct.id(), created.id());
             log.debug("ProductSync: created PS product reference={} id={}", sku, created.id());
-        } else {
-            ProductMapping mapping = existing.get();
-            prestashopClient.updateProduct(mapping.getPrestashopId(),
-                    toPrestashopDto(dolProduct, mapping.getPrestashopId()));
-            mapping.setLastSyncedAt(Instant.now());
-            mapping.setSyncStatus(SyncStatus.SYNCED);
-            mapping.setErrorMessage(null);
-            productMappingRepository.save(mapping);
-            log.debug("ProductSync: updated PS product reference={}", sku);
         }
     }
 
+    private void upsertMapping(String sku, Integer dolibarrId, Integer prestashopId) {
+        ProductMapping mapping = productMappingRepository.findBySku(sku)
+                .orElseGet(() -> ProductMapping.builder().sku(sku).build());
+        mapping.setDolibarrId(dolibarrId);
+        mapping.setPrestashopId(prestashopId);
+        mapping.setLastSyncedAt(Instant.now());
+        mapping.setSyncStatus(SyncStatus.SYNCED);
+        mapping.setErrorMessage(null);
+        productMappingRepository.save(mapping);
+    }
+
     private void markError(String sku, String message) {
         productMappingRepository.findBySku(sku).ifPresent(m -> {
             m.setSyncStatus(SyncStatus.ERROR);
@@ -140,7 +143,7 @@ public class ProductSyncService {
         String categoryId = String.valueOf(integrationProperties.prestashop().defaultCategoryId());
         String label = src.label() != null ? src.label() : "";
         String description = src.description() != null ? src.description() : "";
-        String active = (src.toSell() != null && src.toSell() == 1) ? "1" : "0";
+        String active = (src.toSell() != null && src.toSell() == 0) ? "0" : "1";
 
         return new PrestashopProductDto(
                 prestashopId,
diff --git a/sync-service/src/main/resources/application.yml b/sync-service/src/main/resources/application.yml
index 68f4702..d4c7146 100644
--- a/sync-service/src/main/resources/application.yml
+++ b/sync-service/src/main/resources/application.yml
@@ -4,6 +4,9 @@ spring:
   profiles:
     active: dev
 
+server:
+  forward-headers-strategy: framework
+
 integration:
   dolibarr:
     base-url: ${DOLIBARR_BASE_URL:https://prestashop.loading.net/dolibarr/api/index.php}