feat: implement billing system with credit tracking and RevenueCat integration

server/lib/billing.js

@@ -403,6 +403,19 @@ const syncRevenueCatCustomerInfo = async (db, userId, customerInfo, options = {}
       );
     }
 
+    // Fallback: also check active entitlements for topup products.
+    // This handles cases where a topup product is misconfigured in RevenueCat
+    // to grant an entitlement instead of being treated as a consumable.
+    const rawActiveEntitlements = Object.values(customerInfo?.entitlements?.active || {});
+    for (const entitlement of rawActiveEntitlements) {
+      const productId = entitlement?.productIdentifier;
+      if (isSupportedTopupProduct(productId)) {
+        const purchaseDate = entitlement?.latestPurchaseDate || entitlement?.originalPurchaseDate;
+        const txId = purchaseDate ? `entitlement:${productId}:${purchaseDate}` : null;
+        await grantRevenueCatTopupIfNeeded(tx, account, txId, productId);
+      }
+    }
+
     account.updatedAt = nowIso();
     await upsertAccount(tx, account);
     return {