feat: keep qty=0 instead of auto-delete, ask user to confirm via banner

- useFromInventory: replace DELETE with UPDATE qty=0 when stock hits 0
  (both normal path and use-all-locations path)
- listInventory: add WHERE quantity > 0 so qty=0 rows are invisible in
  the regular inventory list
- New API actions: inventory_finished_items (query) and
  inventory_confirm_finished (delete after user confirms)
- Banner: new 'finished' type (priority 600, above anomalies)
  Shows: '{name} — è finito?' with two buttons
  'Sì, è finito' → permanently deletes the qty=0 row
  'No, ne ho ancora' → navigates to add-inventory form
- i18n: banner_finished_* and toast.product_finished_confirmed (it/en/de)
- DB migration: restored 75 auto-deleted products (last 30 days) as
  qty=0 inventory rows so they appear in the banner queue

api/index.php

@@ -180,6 +180,12 @@ try {
         case 'inventory_delete':
             deleteInventory($db);
             break;
+        case 'inventory_finished_items':
+            getFinishedItems($db);
+            break;
+        case 'inventory_confirm_finished':
+            confirmFinished($db);
+            break;
         case 'inventory_summary':
             inventorySummary($db);
             break;
@@ -701,10 +707,11 @@ function listInventory(PDO $db): void {
                COALESCE(i.vacuum_sealed, 0) as vacuum_sealed, i.opened_at
         FROM inventory i
         JOIN products p ON i.product_id = p.id
+        WHERE i.quantity > 0
     ";
     $params = [];
     if (!empty($location)) {
-        $query .= " WHERE i.location = ?";
+        $query .= " AND i.location = ?";
         $params[] = $location;
     }
     $query .= " ORDER BY p.name ASC";
@@ -893,7 +900,7 @@ function useFromInventory(PDO $db): void {
         $totalRemoved = 0;
         foreach ($allItems as $item) {
             $totalRemoved += $item['quantity'];
-            $stmt = $db->prepare("DELETE FROM inventory WHERE id = ?");
+            $stmt = $db->prepare("UPDATE inventory SET quantity = 0, updated_at = CURRENT_TIMESTAMP WHERE id = ?");
             $stmt->execute([$item['id']]);
             $type = ($notes === 'Buttato') ? 'waste' : 'out';
             $stmt = $db->prepare("INSERT INTO transactions (product_id, type, quantity, location, notes) VALUES (?, ?, ?, ?, ?)");
@@ -971,7 +978,7 @@ function useFromInventory(PDO $db): void {
     $actualDeducted = min($quantity, $existing['quantity']);
     
     if ($newQty <= 0) {
-        $stmt = $db->prepare("DELETE FROM inventory WHERE id = ?");
+        $stmt = $db->prepare("UPDATE inventory SET quantity = 0, updated_at = CURRENT_TIMESTAMP WHERE id = ?");
         $stmt->execute([$existing['id']]);
     } else {
         // Check if item is now opened (first use reduces quantity)
@@ -1149,6 +1156,41 @@ function deleteInventory(PDO $db): void {
     echo json_encode(['success' => true]);
 }
 
+/**
+ * Returns products whose entire inventory is at quantity = 0
+ * (auto-set when stock ran out, pending user confirmation to permanently remove).
+ */
+function getFinishedItems(PDO $db): void {
+    $rows = $db->query("
+        SELECT p.id AS product_id, p.name, p.brand, p.unit, p.default_quantity, p.package_unit, p.image_url,
+               MIN(i.location) AS location,
+               MAX(i.updated_at) AS updated_at
+        FROM products p
+        JOIN inventory i ON i.product_id = p.id
+        WHERE NOT EXISTS (
+            SELECT 1 FROM inventory i2 WHERE i2.product_id = p.id AND i2.quantity > 0
+        )
+        GROUP BY p.id
+        ORDER BY MAX(i.updated_at) DESC
+    ")->fetchAll(PDO::FETCH_ASSOC);
+    echo json_encode(['success' => true, 'finished' => $rows], JSON_UNESCAPED_UNICODE);
+}
+
+/**
+ * Permanently delete all qty=0 inventory rows for a product after user confirms it is finished.
+ */
+function confirmFinished(PDO $db): void {
+    $input = json_decode(file_get_contents('php://input'), true);
+    $productId = (int)($input['product_id'] ?? 0);
+    if (!$productId) {
+        http_response_code(400);
+        echo json_encode(['error' => 'product_id required']);
+        return;
+    }
+    $db->prepare("DELETE FROM inventory WHERE product_id = ? AND quantity = 0")->execute([$productId]);
+    echo json_encode(['success' => true]);
+}
+
 function inventorySummary(PDO $db): void {
     $stmt = $db->query("
         SELECT i.location, COUNT(DISTINCT i.product_id) as product_count, 

assets/js/app.js

@@ -2354,10 +2354,11 @@ async function loadBannerAlerts() {
     if (!banner) { console.warn('[Banner] #alert-banner not found'); return; }
 
     try {
-        const [invData, predData, anomalyData] = await Promise.all([
+        const [invData, predData, anomalyData, finishedData] = await Promise.all([
             api('inventory_list'),
             api('consumption_predictions').catch(err => { console.warn('[Banner] predictions fetch failed:', err); return { predictions: [] }; }),
             api('inventory_anomalies').catch(err => { console.warn('[Banner] anomalies fetch failed:', err); return { anomalies: [] }; }),
+            api('inventory_finished_items').catch(err => { console.warn('[Banner] finished_items fetch failed:', err); return { finished: [] }; }),
         ]);
         const items = invData.inventory || [];
         const confirmed = getReviewConfirmed();
@@ -2400,6 +2401,13 @@ async function loadBannerAlerts() {
             _bannerQueue.push({ type: 'anomaly', data: an });
         });
 
+        // 6. Finished products: inventory hit 0, waiting for user confirmation
+        const finished = finishedData.finished || [];
+        finished.forEach(fin => {
+            if (confirmed['fin_' + fin.product_id]) return;
+            _bannerQueue.push({ type: 'finished', data: fin });
+        });
+
         // Sort by priority (highest first)
         _bannerQueue.sort((a, b) => _bannerPriority(b) - _bannerPriority(a));
 
@@ -2451,6 +2459,8 @@ function _bannerPriority(entry) {
             // Phantom (inflated qty) = 250, Missing = 260 (slightly higher, means data is clearly wrong)
             return entry.data.direction === 'missing' ? 260 : 250;
         }
+        case 'finished':
+            return 600; // product ran out — confirm before removing from DB
         default:
             return 0;
     }
@@ -2542,6 +2552,16 @@ function renderBannerItem() {
         }
         actionsEl.innerHTML = btns;
 
+    } else if (entry.type === 'finished') {
+        const fin = entry.data;
+        banner.className = 'alert-banner banner-finished';
+        iconEl.textContent = '📦';
+        titleEl.textContent = `${fin.name}${fin.brand ? ' (' + fin.brand + ')' : ''} — ${t('dashboard.banner_finished_title')}`;
+        detailEl.textContent = t('dashboard.banner_finished_detail', { name: fin.name });
+        let btns = `<button class="btn-banner btn-banner-ok" onclick="confirmBannerFinished()">${t('dashboard.banner_finished_action_yes')}</button>`;
+        btns += `<button class="btn-banner btn-banner-edit" onclick="notFinishedBannerAction()">${t('dashboard.banner_finished_action_no')}</button>`;
+        actionsEl.innerHTML = btns;
+
     } else if (entry.type === 'anomaly') {
         const an = entry.data;
         const isPhantom = an.direction === 'phantom';
@@ -2699,6 +2719,40 @@ function dismissBannerExpiring() {
     dismissBannerItem();
 }
 
+async function confirmBannerFinished() {
+    const entry = _bannerQueue[_bannerIndex];
+    if (!entry || entry.type !== 'finished') return;
+    const productId = entry.data.product_id;
+    try {
+        await api('inventory_confirm_finished', {}, 'POST', { product_id: productId });
+    } catch(e) {}
+    setReviewConfirmed('fin_' + productId);
+    showToast(t('toast.product_finished_confirmed'), 'success');
+    dismissBannerItem();
+}
+
+async function notFinishedBannerAction() {
+    const entry = _bannerQueue[_bannerIndex];
+    if (!entry || entry.type !== 'finished') return;
+    const productId = entry.data.product_id;
+    // Remove from this session's queue (will re-appear next load if still at qty=0)
+    dismissBannerItem();
+    showLoading(true);
+    try {
+        const data = await api('product_get', { id: productId });
+        showLoading(false);
+        if (data.product) {
+            currentProduct = data.product;
+            showAddForm();
+        } else {
+            showToast(t('error.not_found'), 'error');
+        }
+    } catch(e) {
+        showLoading(false);
+        showToast(t('error.connection'), 'error');
+    }
+}
+
 // --- Banner swipe navigation ---
 let _bannerTouchStartX = 0;
 let _bannerTouchStartY = 0;

translations/de.json

@@ -105,7 +105,11 @@
         "banner_expiring_today": "Läuft heute ab!",
         "banner_expiring_tomorrow": "Läuft morgen ab",
         "banner_expiring_days": "Läuft in {days} Tagen ab",
-        "banner_expiring_action_use": "Jetzt verwenden"
+        "banner_expiring_action_use": "Jetzt verwenden",
+        "banner_finished_title": "aufgebraucht?",
+        "banner_finished_detail": "Ich habe vermerkt, dass {name} auf null gesunken ist. Ist es wirklich leer, oder hast du noch welches?",
+        "banner_finished_action_yes": "Ja, aufgebraucht",
+        "banner_finished_action_no": "Nein, ich habe noch welches"
     },
     "inventory": {
         "title": "Vorrat",
@@ -426,6 +430,7 @@
         "finished_to_bring": "🛒 Produkt aufgebraucht → zu Bring! hinzugefügt",
         "thrown_away": "🗑️ {name} weggeworfen!",
         "thrown_away_partial": "🗑️ {qty} {unit} von {name} weggeworfen",
+        "product_finished_confirmed": "✅ Entfernt — wieder hinzufügen, wenn du nachkaufst",
         "appliance_added": "Gerät hinzugefügt",
         "item_added": "{name} hinzugefügt"
     },

translations/en.json

@@ -105,7 +105,11 @@
         "banner_expiring_today": "Expires today!",
         "banner_expiring_tomorrow": "Expires tomorrow",
         "banner_expiring_days": "Expires in {days} days",
-        "banner_expiring_action_use": "Use now"
+        "banner_expiring_action_use": "Use now",
+        "banner_finished_title": "finished?",
+        "banner_finished_detail": "I recorded that {name} reached zero stock. Is it really gone, or do you still have some?",
+        "banner_finished_action_yes": "Yes, it's done",
+        "banner_finished_action_no": "No, I still have some"
     },
     "inventory": {
         "title": "Pantry",
@@ -426,6 +430,7 @@
         "finished_to_bring": "🛒 Product finished → added to Bring!",
         "thrown_away": "🗑️ {name} thrown away!",
         "thrown_away_partial": "🗑️ Thrown away {qty} {unit} of {name}",
+        "product_finished_confirmed": "✅ Removed — add it again when you restock",
         "appliance_added": "Appliance added",
         "item_added": "{name} added"
     },

translations/it.json

@@ -105,7 +105,11 @@
         "banner_expiring_today": "Scade oggi!",
         "banner_expiring_tomorrow": "Scade domani",
         "banner_expiring_days": "Scade tra {days} giorni",
-        "banner_expiring_action_use": "Usa ora"
+        "banner_expiring_action_use": "Usa ora",
+        "banner_finished_title": "è finito?",
+        "banner_finished_detail": "Ho registrato che {name} ha toccato quota zero. È davvero finito o hai ancora delle scorte?",
+        "banner_finished_action_yes": "Sì, è finito",
+        "banner_finished_action_no": "No, ne ho ancora"
     },
     "inventory": {
         "title": "Dispensa",
@@ -426,6 +430,7 @@
         "finished_to_bring": "🛒 Prodotto finito → aggiunto a Bring!",
         "thrown_away": "🗑️ {name} buttato!",
         "thrown_away_partial": "🗑️ Buttato {qty} {unit} di {name}",
+        "product_finished_confirmed": "✅ Rimosso — riaggiungi quando ne ricompri",
         "appliance_added": "Elettrodomestico aggiunto",
         "item_added": "{name} aggiunto"
     },