Fix tests: add data_transfer_bytes to expected API responses

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Andrey Cheptsov

src/dstack/_internal/server/migrations/versions/2026/03_25_1200_a1b2c3d4e5f6_add_data_transfer_bytes_to_instances.py

@@ -1,7 +1,7 @@
 """Add data_transfer_bytes to instances
 
 Revision ID: a1b2c3d4e5f6
-Revises: 8b6d5d8c1b9a
+Revises: c1c2ecaee45c
 Create Date: 2026-03-25 12:00:00.000000+00:00
 
 """
@@ -11,7 +11,7 @@
 
 # revision identifiers, used by Alembic.
 revision = "a1b2c3d4e5f6"
-down_revision = "8b6d5d8c1b9a"
+down_revision = "c1c2ecaee45c"
 branch_labels = None
 depends_on = None
 

src/dstack/_internal/server/services/instances.py

@@ -241,7 +241,7 @@ def instance_model_to_instance(instance_model: InstanceModel) -> Instance:
         finished_at=instance_model.finished_at,
         total_blocks=instance_model.total_blocks,
         busy_blocks=instance_model.busy_blocks,
-        data_transfer_bytes=instance_model.data_transfer_bytes,
+        data_transfer_bytes=instance_model.data_transfer_bytes or 0,
     )
 
     offer = get_instance_offer(instance_model)

src/tests/_internal/server/routers/test_fleets.py

@@ -1025,6 +1025,7 @@ async def test_creates_fleet(self, test_db, session: AsyncSession, client: Async
                     "price": None,
                     "total_blocks": 1,
                     "busy_blocks": 0,
+                    "data_transfer_bytes": 0,
                 }
             ],
         }
@@ -1167,6 +1168,7 @@ async def test_creates_ssh_fleet(self, test_db, session: AsyncSession, client: A
                     "price": 0.0,
                     "total_blocks": 1,
                     "busy_blocks": 0,
+                    "data_transfer_bytes": 0,
                 }
             ],
         }
@@ -1347,6 +1349,7 @@ async def test_updates_ssh_fleet(self, test_db, session: AsyncSession, client: A
                     "price": 0.0,
                     "total_blocks": 1,
                     "busy_blocks": 0,
+                    "data_transfer_bytes": 0,
                 },
                 {
                     "id": SomeUUID4Str(),
@@ -1382,6 +1385,7 @@ async def test_updates_ssh_fleet(self, test_db, session: AsyncSession, client: A
                     "price": 0.0,
                     "total_blocks": 1,
                     "busy_blocks": 0,
+                    "data_transfer_bytes": 0,
                 },
             ],
         }