feat: implement database management service layer and frontend SQL import/export utility

backend/app/Contracts/DatabaseDriverInterface.php

@@ -37,7 +37,7 @@ interface DatabaseDriverInterface
     /**
      * Export the database.
      */
-    public function export(array $config, array $filters = []): string;
+    public function export(array $config, array $filters = [], array $options = []): string;
 
     /**
      * Import the database.

backend/app/Http/Controllers/Api/SchemaController.php

@@ -112,8 +112,11 @@ class SchemaController extends Controller
             $this->initializeDriver($request);
             $config = $request->only(['host', 'username', 'password', 'database', 'port', 'table']);
             $filters = json_decode($request->get('filters', '[]'), true);
+            $options = [
+                'structureOnly' => filter_var($request->get('structureOnly'), FILTER_VALIDATE_BOOLEAN)
+            ];
             
-            $filePath = $this->databaseService->export($config, $filters);
+            $filePath = $this->databaseService->export($config, $filters, $options);
             
             return Response::download($filePath)->deleteFileAfterSend(true);
         } catch (\Exception $e) {

backend/app/Services/Database/MySqlDriver.php

@@ -147,7 +147,7 @@ class MySqlDriver implements DatabaseDriverInterface, SchemaDiscoveryInterface
         return $this->query($sql, [$table, $dbName]);
     }
 
-    public function export(array $config, array $filters = []): string
+    public function export(array $config, array $filters = [], array $options = []): string
     {
         $database = $config['database'] ?? '';
         $table = $config['table'] ?? '';
@@ -157,9 +157,11 @@ class MySqlDriver implements DatabaseDriverInterface, SchemaDiscoveryInterface
             return $this->exportFilteredTable($database, $table, $filters);
         }
 
+        $isStructureOnly = $options['structureOnly'] ?? false;
+
         $filename = !empty($table) 
-            ? "{$table}-" . date('Y-m-d') . ".sql" 
-            : "backup-" . ($database ?: 'all') . "-" . date('Y-m-d') . ".sql";
+            ? "{$table}-" . ($isStructureOnly ? 'schema-' : '') . date('Y-m-d') . ".sql" 
+            : "backup-" . ($database ?: 'all') . "-" . ($isStructureOnly ? 'schema-' : '') . date('Y-m-d') . ".sql";
 
         $directory = storage_path('app/backups');
         if (!is_dir($directory)) {
@@ -191,6 +193,10 @@ class MySqlDriver implements DatabaseDriverInterface, SchemaDiscoveryInterface
         // --quick: useful for large tables
         $flags = "--single-transaction --skip-lock-tables --routines --triggers --events --quick";
 
+        if ($isStructureOnly) {
+            $flags .= " --no-data";
+        }
+
         $command = sprintf(
             '%s -u %s %s -h %s -P %s %s %s > %s 2> %s',
             $mysqldumpPath === 'mysqldump' ? 'mysqldump' : escapeshellarg($mysqldumpPath),

backend/app/Services/DatabaseService.php

@@ -102,9 +102,9 @@ class DatabaseService
     /**
      * Export the database.
      */
-    public function export(array $config, array $filters = []): string
+    public function export(array $config, array $filters = [], array $options = []): string
     {
-        return $this->getDriver()->export($config, $filters);
+        return $this->getDriver()->export($config, $filters, $options);
     }
 
     /**