feat : add DatabaseInfo API resource and provider

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/State/DatabaseInfoProvider.php

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProviderInterface;
+use App\ApiResource\DatabaseInfo;
+use App\Repository\EnvironmentRepository;
+use App\Service\DatabaseService;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+final readonly class DatabaseInfoProvider implements ProviderInterface
+{
+    public function __construct(
+        private EnvironmentRepository $environmentRepository,
+        private DatabaseService $databaseService,
+    ) {}
+
+    public function provide(Operation $operation, array $uriVariables = [], array $context = []): DatabaseInfo
+    {
+        $id = $uriVariables['id'] ?? null;
+        $environment = $id ? $this->environmentRepository->find($id) : null;
+
+        if (null === $environment) {
+            throw new NotFoundHttpException(sprintf('Environment "%s" not found.', $id));
+        }
+
+        $databaseName = $environment->getDatabaseName();
+
+        if (null === $databaseName || '' === $databaseName) {
+            throw new NotFoundHttpException('No database configured for this environment.');
+        }
+
+        $info = $this->databaseService->getDatabaseInfo($databaseName);
+
+        $dto = new DatabaseInfo();
+        $dto->connected = $info['connected'];
+        $dto->name = $info['name'];
+        $dto->size = $info['size'];
+        $dto->tableCount = $info['tableCount'];
+        $dto->activeConnections = $info['activeConnections'];
+        $dto->cacheHitRatio = $info['cacheHitRatio'];
+        $dto->largestTable = $info['largestTable'];
+
+        return $dto;
+    }
+}