diff --git a/database/migrations/0001_01_01_000000_create_users_table.php b/database/migrations/0001_01_01_000000_create_users_table.php
index d8e79aa..2978fe3 100644
--- a/database/migrations/0001_01_01_000000_create_users_table.php
+++ b/database/migrations/0001_01_01_000000_create_users_table.php
@@ -21,7 +21,7 @@ public function up(): void
             $table->rememberToken();
             $table->foreignId('current_team_id')->nullable();
             $table->string('profile_photo_path', 2048)->nullable();
-            $table->foreignIdFor(Site::class, 'site_id')->nullable();
+            $table->foreignIdFor(Site::class)->nullable()->index();
             $table->timestamps();
         });
 
diff --git a/database/migrations/2024_12_27_060234_create_studies_table.php b/database/migrations/2024_12_27_060234_create_studies_table.php
index 684e42e..71a738a 100644
--- a/database/migrations/2024_12_27_060234_create_studies_table.php
+++ b/database/migrations/2024_12_27_060234_create_studies_table.php
@@ -27,8 +27,9 @@ public function up(): void
             $table->dateTime('upload_date')->index();
             $table->foreignIdFor(Site::class)->constrained()->onDelete('cascade');
             $table->tinyInteger('report_status')->default(0);
-            $table->string('study_modality');
-            $table->foreignIdFor(User::class, 'assigned_radiologist_id')->nullable()->constrained()->onDelete('set null');
+            $table->string('study_modality',4);
+            $table->foreignIdFor(User::class, 'assigned_physician_id')->nullable()->constrained()->onDelete('set null');
+            $table->foreignIdFor(User::class, 'interpreting_physician_id')->nullable()->constrained()->onDelete('set null');
             $table->timestamps();
 
             $table->index(['site_id', 'upload_date']);