GenerateAddresses: skip already used address or subaddress index

app/Console/Commands/GenerateAddresses.php

@@ -46,9 +46,18 @@ class GenerateAddresses extends Command
         $projects = Project::whereNotNull('filename')->whereNull('address')->where('state', 'FUNDING-REQUIRED')->get();
         foreach ($projects as $project) {
             $addressDetails = $wallet->getPaymentAddress();
+
+            $address = $addressDetails['address'];
+            $subaddr_index = $coin->subaddrIndex($addressDetails, $project);
+            if (Project::where('address', $address)->orWhere('subaddr_index', $subaddr_index)->first())
+            {
+                $this->error('Skipping already used address ' . $address . ' or subaddr_index ' . $subaddr_index);
+                continue;
+            }
+
             $project->address_uri = $wallet->createQrCodeString($addressDetails['address']);
-            $project->address = $addressDetails['address'];
-            $project->subaddr_index = $coin->subaddrIndex($addressDetails, $project);
+            $project->address = $address;
+            $project->subaddr_index = $subaddr_index;
             Storage::disk('public')->put("/img/qrcodes/{$project->subaddr_index}.png", $project->generateQrcode());
             $project->qr_code = "img/qrcodes/{$project->subaddr_index}.png";
             $project->raised_amount = 0;