diff --git a/backend/app/models/import_settings.py b/backend/app/models/import_settings.py
index b8d0d83..9af4ed0 100644
--- a/backend/app/models/import_settings.py
+++ b/backend/app/models/import_settings.py
@@ -12,7 +12,9 @@ from .base import Base
 
 class ImportSettings(Base):
     __tablename__ = "import_settings"
-    __table_args__ = (CheckConstraint("id = 1", name="ck_import_settings_singleton"),)
+    # Bare constraint name — Base.metadata's naming convention applies the
+    # ck_<table>_<name> prefix, producing the final ck_import_settings_singleton.
+    __table_args__ = (CheckConstraint("id = 1", name="singleton"),)
 
     id: Mapped[int] = mapped_column(Integer, primary_key=True)
     import_scan_path: Mapped[str] = mapped_column(Text, nullable=False, default="/import")
diff --git a/tests/test_health.py b/tests/test_health.py
index d4eb411..b8f9b2a 100644
--- a/tests/test_health.py
+++ b/tests/test_health.py
@@ -1,11 +1,12 @@
 """Health endpoint smoke test."""
 
 import pytest
+import pytest_asyncio
 
 from backend.app import create_app
 
 
-@pytest.fixture
+@pytest_asyncio.fixture
 async def client():
     app = create_app()
     async with app.test_client() as c:
diff --git a/tests/test_tasks_register.py b/tests/test_tasks_register.py
index 5d4e941..a8d4f72 100644
--- a/tests/test_tasks_register.py
+++ b/tests/test_tasks_register.py
@@ -1,5 +1,15 @@
-"""Confirms every FC-2a task module imports cleanly and registers with Celery."""
+"""Confirms every FC-2a task module imports cleanly and registers with Celery.
 
+Celery's `include=[...]` parameter on the Celery() constructor is lazy — it
+only imports those modules when a worker boots. To assert task registration
+in a plain pytest run we explicitly import the task modules ourselves.
+"""
+
+# Importing for side-effect: each module's @celery.task decorators register
+# the task with the global Celery instance at module import time.
+import backend.app.tasks.import_file  # noqa: F401
+import backend.app.tasks.scan  # noqa: F401
+import backend.app.tasks.thumbnail  # noqa: F401
 from backend.app.celery_app import celery