perf(database): add indexes for timestamps and JSON brand code in migrations

database/migrations/2026_08_11_000000_create_employees_table.php

@@ -33,6 +33,8 @@ return new class () extends Migration
             $table->index('site');
             $table->index('service');
             $table->index('establishment');
+            $table->index('created_at');
+            $table->index('updated_at');
         });
     }
 

database/migrations/2026_08_14_000001_create_inco_sheets_table.php

@@ -42,6 +42,9 @@ return new class () extends Migration
 
             $table->index('name');
             $table->index('compo_id');
+            $table->index('created_at');
+            $table->index('updated_at');
+            $table->index('brand->code');
         });
     }