diff --git a/database/migrations/2024_12_30_152300_create_audit_logs_table.php b/database/migrations/2024_12_30_152300_create_audit_logs_table.php
index 3ad245b..65d6a83 100644
--- a/database/migrations/2024_12_30_152300_create_audit_logs_table.php
+++ b/database/migrations/2024_12_30_152300_create_audit_logs_table.php
@@ -17,9 +17,11 @@ public function up(): void
             $table->ipAddress('ip_addr')->nullable();
             $table->unsignedBigInteger('user_agent_id')->nullable();
             $table->string('orthanc_uuid')->nullable();
-            $table->text('url')->nullable();
+            $table->string('url')->nullable();
             $table->text('notes')->nullable();
             $table->timestamp('created_at');
+
+            $table->index(['study_id', 'created_at']);
         });
     }