diff --git a/apps/terminal/migrations/0009_session_replay_size.py b/apps/terminal/migrations/0009_session_replay_size.py
new file mode 100644
index 000000000..895a7c600
--- /dev/null
+++ b/apps/terminal/migrations/0009_session_replay_size.py
@@ -0,0 +1,18 @@
+# Generated by Django 4.1.13 on 2025-07-07 06:58
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('terminal', '0008_endpoint_mongodb_port'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='session',
+            name='replay_size',
+            field=models.BigIntegerField(default=0, verbose_name='Replay size'),
+        ),
+    ]
diff --git a/apps/terminal/models/session/session.py b/apps/terminal/models/session/session.py
index 8c6897238..f47d28243 100644
--- a/apps/terminal/models/session/session.py
+++ b/apps/terminal/models/session/session.py
@@ -50,6 +50,7 @@ class Session(OrgModelMixin):
     comment = models.TextField(blank=True, null=True, verbose_name=_("Comment"))
     cmd_amount = models.IntegerField(default=-1, verbose_name=_("Command amount"))
     error_reason = models.CharField(max_length=128, blank=True, verbose_name=_("Error reason"))
+    replay_size = models.BigIntegerField(default=0, verbose_name=_("Replay size"))
 
     upload_to = 'replay'
     ACTIVE_CACHE_KEY_PREFIX = 'SESSION_ACTIVE_{}'
diff --git a/apps/terminal/serializers/session.py b/apps/terminal/serializers/session.py
index 2922187c8..f06231115 100644
--- a/apps/terminal/serializers/session.py
+++ b/apps/terminal/serializers/session.py
@@ -48,7 +48,7 @@ class SessionSerializer(BulkOrgResourceModelSerializer):
             "protocol", 'type', "login_from", "remote_addr",
             "is_success", "is_finished", "has_replay", "has_command",
             "date_start", "date_end", "duration", "comment", "terminal_display", "is_locked",
-            'command_amount', 'error_reason'
+            'command_amount', 'error_reason', 'replay_size',
         ]
         fields_fk = ["terminal", ]
         fields_custom = ["can_replay", "can_join", "can_terminate"]