fix(dashboard): bound recent deployments query per application

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

database/migrations/2026_10_28_224423_add_index_for_dashboard_recent_deployments.php

@@ -0,0 +1,41 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public $withinTransaction = false;
+
+    public function up(): void
+    {
+        if (DB::getDriverName() === 'pgsql') {
+            DB::statement('CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_deployment_queues_app_id ON application_deployment_queues (application_id, id)');
+
+            return;
+        }
+
+        if (! Schema::hasIndex('application_deployment_queues', 'idx_deployment_queues_app_id')) {
+            Schema::table('application_deployment_queues', function (Blueprint $table) {
+                $table->index(['application_id', 'id'], 'idx_deployment_queues_app_id');
+            });
+        }
+    }
+
+    public function down(): void
+    {
+        if (DB::getDriverName() === 'pgsql') {
+            DB::statement('DROP INDEX CONCURRENTLY IF EXISTS idx_deployment_queues_app_id');
+
+            return;
+        }
+
+        if (Schema::hasIndex('application_deployment_queues', 'idx_deployment_queues_app_id')) {
+            Schema::table('application_deployment_queues', function (Blueprint $table) {
+                $table->dropIndex('idx_deployment_queues_app_id');
+            });
+        }
+    }
+};