feat: notification center backend core (PR-1)

- Add notifications table with Alembic migration
- Notification model with user-scoped indexing and partial index on unread
- NotificationService singleton with create/list/count/mark-read/dismiss
- FastAPI router: GET /notifications, GET /unread, PATCH /{id}/read,
  POST /mark-all-read, DELETE /{id}
- Mute categories filtering from UserConfig
- 13 unit tests for NotificationService
- 10 integration tests for API endpoints
- Updated test_models.py with new table registration

Quality gates: pytest 23 new passed, ruff clean

apps/api/tests/integration/test_models.py

@@ -16,7 +16,6 @@ def test_base_metadata_collects_declared_tables() -> None:
 
 
 @pytest.mark.integration
-
 def test_shared_mixins_define_expected_columns() -> None:
     assert "id" in UUIDPrimaryKeyMixin.__dict__
     assert "created_at" in TimestampMixin.__dict__
@@ -24,20 +23,26 @@ def test_shared_mixins_define_expected_columns() -> None:
 
 
 @pytest.mark.integration
-
 def test_expected_tables_are_registered() -> None:
     assert set(Base.metadata.tables) == {
-        "refresh_tokens",
+        "config_profile_includes",
+        "config_profiles",
         "git_repositories",
+        "health_checks",
+        "instance_events",
+        "notifications",
         "projects",
         "ssh_keys",
+        "terminal_sessions",
+        "tool_definition_manifests",
+        "tool_instances",
+        "tool_types",
         "user_configs",
         "users",
     }
 
 
 @pytest.mark.integration
-
 def test_user_table_has_required_columns() -> None:
     columns = User.__table__.columns
 
@@ -56,7 +61,6 @@ def test_user_table_has_required_columns() -> None:
 
 
 @pytest.mark.integration
-
 def test_project_relationships_point_to_owner_and_default_ssh_key() -> None:
     owner_fk = next(iter(Project.__table__.c.owner_id.foreign_keys))
     ssh_fk = next(iter(Project.__table__.c.default_ssh_key_id.foreign_keys))
@@ -68,7 +72,6 @@ def test_project_relationships_point_to_owner_and_default_ssh_key() -> None:
 
 
 @pytest.mark.integration
-
 def test_repository_and_user_config_relationships_are_registered() -> None:
     project_fk = next(iter(GitRepository.__table__.c.project_id.foreign_keys))
     owner_fk = next(iter(GitRepository.__table__.c.owner_id.foreign_keys))
@@ -84,9 +87,13 @@ def test_repository_and_user_config_relationships_are_registered() -> None:
 
 @pytest.mark.asyncio
 @pytest.mark.integration
-
 async def test_async_session_can_insert_and_load_user(db_session: AsyncSession) -> None:
-    user = User(email="dev@headquarter.local", name="Dev User", authentik_id="dev-user", avatar_url=None)
+    user = User(
+        email="dev@headquarter.local",
+        name="Dev User",
+        authentik_id="dev-user",
+        avatar_url=None,
+    )
 
     db_session.add(user)
     await db_session.commit()

apps/api/tests/integration/test_notifications_api.py

@@ -0,0 +1,326 @@
+"""Integration tests for notifications API."""
+
+import uuid
+from datetime import datetime, timedelta, timezone
+
+import pytest
+from fastapi.testclient import TestClient
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from src.models.user import User
+from src.models.user_config import UserConfig
+from src.services.notification_service import NotificationService
+
+
+@pytest.fixture
+def notification_service() -> NotificationService:
+    return NotificationService()
+
+
+@pytest.fixture
+async def user_a(db_session: AsyncSession) -> User:
+    user = User(
+        id=uuid.uuid4(),
+        email="user-a@headquarter.local",
+        name="User A",
+        authentik_id=f"authentik-{uuid.uuid4()}",
+        avatar_url=None,
+    )
+    db_session.add(user)
+    await db_session.commit()
+    return user
+
+
+@pytest.fixture
+async def user_b(db_session: AsyncSession) -> User:
+    user = User(
+        id=uuid.uuid4(),
+        email="user-b@headquarter.local",
+        name="User B",
+        authentik_id=f"authentik-{uuid.uuid4()}",
+        avatar_url=None,
+    )
+    db_session.add(user)
+    await db_session.commit()
+    return user
+
+
+def _mint_cookie_for_user(test_client: TestClient, user_id: uuid.UUID) -> None:
+    from src.auth.session import create_session_cookie
+    from src.config import Settings
+
+    settings = Settings()
+    cookie = create_session_cookie(
+        settings=settings,
+        user_id=str(user_id),
+    )
+    test_client.cookies.set("session", cookie)
+
+
+@pytest.mark.integration
+def test_list_requires_auth(test_client: TestClient) -> None:
+    response = test_client.get("/notifications")
+    assert response.status_code == 401
+
+
+@pytest.mark.integration
+def test_list_returns_only_own_notifications(
+    authenticated_client: TestClient,
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+    user_b: User,
+) -> None:
+    async def create_notifications() -> None:
+        await notification_service.create_notification(
+            db_session, user_a.id, category="instance", severity="info", title="A"
+        )
+        await notification_service.create_notification(
+            db_session, user_b.id, category="instance", severity="info", title="B"
+        )
+
+    import asyncio
+
+    asyncio.run(create_notifications())
+
+    _mint_cookie_for_user(authenticated_client, user_a.id)
+    response = authenticated_client.get("/notifications")
+    assert response.status_code == 200
+    data = response.json()
+    assert len(data["items"]) == 1
+    assert data["items"][0]["title"] == "A"
+
+
+@pytest.mark.integration
+def test_list_pagination(
+    authenticated_client: TestClient,
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    async def create_many() -> None:
+        for i in range(25):
+            n = await notification_service.create_notification(
+                db_session,
+                user_a.id,
+                category="instance",
+                severity="info",
+                title=f"Notification {i}",
+            )
+            n.created_at = datetime.now(timezone.utc) - timedelta(seconds=i)
+            await db_session.commit()
+            await db_session.refresh(n)
+
+    import asyncio
+
+    asyncio.run(create_many())
+
+    _mint_cookie_for_user(authenticated_client, user_a.id)
+    response = authenticated_client.get("/notifications?limit=10&offset=10")
+    assert response.status_code == 200
+    data = response.json()
+    assert len(data["items"]) == 10
+    assert data["total"] == 25
+    assert data["limit"] == 10
+    assert data["offset"] == 10
+
+
+@pytest.mark.integration
+def test_unread_count_endpoint(
+    authenticated_client: TestClient,
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    async def create_unread() -> None:
+        for _ in range(3):
+            await notification_service.create_notification(
+                db_session,
+                user_a.id,
+                category="instance",
+                severity="info",
+                title="Unread",
+            )
+
+    import asyncio
+
+    asyncio.run(create_unread())
+
+    _mint_cookie_for_user(authenticated_client, user_a.id)
+    response = authenticated_client.get("/notifications/unread")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["count"] == 3
+
+
+@pytest.mark.integration
+def test_mark_read_endpoint(
+    authenticated_client: TestClient,
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    async def create_and_get() -> uuid.UUID:
+        n = await notification_service.create_notification(
+            db_session, user_a.id, category="instance", severity="info", title="To read"
+        )
+        return n.id
+
+    import asyncio
+
+    nid = asyncio.run(create_and_get())
+
+    _mint_cookie_for_user(authenticated_client, user_a.id)
+    response = authenticated_client.patch(f"/notifications/{nid}/read")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["read_at"] is not None
+
+
+@pytest.mark.integration
+def test_mark_read_404_for_other_user(
+    authenticated_client: TestClient,
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+    user_b: User,
+) -> None:
+    async def create_and_get() -> uuid.UUID:
+        n = await notification_service.create_notification(
+            db_session,
+            user_a.id,
+            category="instance",
+            severity="info",
+            title="Owned by A",
+        )
+        return n.id
+
+    import asyncio
+
+    nid = asyncio.run(create_and_get())
+
+    _mint_cookie_for_user(authenticated_client, user_b.id)
+    response = authenticated_client.patch(f"/notifications/{nid}/read")
+    assert response.status_code == 404
+
+
+@pytest.mark.integration
+def test_mark_all_read_endpoint(
+    authenticated_client: TestClient,
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    async def create_unread() -> None:
+        for _ in range(4):
+            await notification_service.create_notification(
+                db_session,
+                user_a.id,
+                category="instance",
+                severity="info",
+                title="Unread",
+            )
+
+    import asyncio
+
+    asyncio.run(create_unread())
+
+    _mint_cookie_for_user(authenticated_client, user_a.id)
+    response = authenticated_client.post("/notifications/mark-all-read")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["marked_count"] == 4
+
+
+@pytest.mark.integration
+def test_dismiss_endpoint(
+    authenticated_client: TestClient,
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    async def create_and_get() -> uuid.UUID:
+        n = await notification_service.create_notification(
+            db_session,
+            user_a.id,
+            category="instance",
+            severity="info",
+            title="To dismiss",
+        )
+        return n.id
+
+    import asyncio
+
+    nid = asyncio.run(create_and_get())
+
+    _mint_cookie_for_user(authenticated_client, user_a.id)
+    response = authenticated_client.delete(f"/notifications/{nid}")
+    assert response.status_code == 204
+
+    response = authenticated_client.get("/notifications")
+    data = response.json()
+    assert len(data["items"]) == 0
+
+
+@pytest.mark.integration
+def test_dismiss_404_for_other_user(
+    authenticated_client: TestClient,
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+    user_b: User,
+) -> None:
+    async def create_and_get() -> uuid.UUID:
+        n = await notification_service.create_notification(
+            db_session,
+            user_a.id,
+            category="instance",
+            severity="info",
+            title="Owned by A",
+        )
+        return n.id
+
+    import asyncio
+
+    nid = asyncio.run(create_and_get())
+
+    _mint_cookie_for_user(authenticated_client, user_b.id)
+    response = authenticated_client.delete(f"/notifications/{nid}")
+    assert response.status_code == 404
+
+
+@pytest.mark.integration
+def test_mute_categories_filter_in_list(
+    authenticated_client: TestClient,
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    async def setup() -> None:
+        config = UserConfig(
+            user_id=user_a.id, config={"notification_mute_categories": ["instance"]}
+        )
+        db_session.add(config)
+        await db_session.commit()
+
+        await notification_service.create_notification(
+            db_session,
+            user_a.id,
+            category="instance",
+            severity="info",
+            title="Instance",
+        )
+        await notification_service.create_notification(
+            db_session, user_a.id, category="system", severity="info", title="System"
+        )
+
+    import asyncio
+
+    asyncio.run(setup())
+
+    _mint_cookie_for_user(authenticated_client, user_a.id)
+    response = authenticated_client.get("/notifications")
+    assert response.status_code == 200
+    data = response.json()
+    assert len(data["items"]) == 1
+    assert data["items"][0]["title"] == "System"

apps/api/tests/unit/test_notification_service.py

@@ -0,0 +1,334 @@
+"""Unit tests for NotificationService."""
+
+import uuid
+from datetime import datetime, timedelta, timezone
+
+import pytest
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from src.models.notification import Notification
+from src.models.user import User
+from src.services.notification_service import NotificationService
+
+
+@pytest.fixture
+def notification_service() -> NotificationService:
+    return NotificationService()
+
+
+@pytest.fixture
+async def user_a(db_session: AsyncSession) -> User:
+    user = User(
+        id=uuid.uuid4(),
+        email="user-a@headquarter.local",
+        name="User A",
+        authentik_id=f"authentik-{uuid.uuid4()}",
+        avatar_url=None,
+    )
+    db_session.add(user)
+    await db_session.commit()
+    return user
+
+
+@pytest.fixture
+async def user_b(db_session: AsyncSession) -> User:
+    user = User(
+        id=uuid.uuid4(),
+        email="user-b@headquarter.local",
+        name="User B",
+        authentik_id=f"authentik-{uuid.uuid4()}",
+        avatar_url=None,
+    )
+    db_session.add(user)
+    await db_session.commit()
+    return user
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_create_notification(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    notification = await notification_service.create_notification(
+        db_session,
+        user_a.id,
+        category="instance",
+        severity="info",
+        title="Container started",
+        message="Instance is running",
+        source_type="tool_instances",
+        source_id=uuid.uuid4(),
+        metadata={"key": "value"},
+    )
+
+    assert notification.user_id == user_a.id
+    assert notification.category == "instance"
+    assert notification.severity == "info"
+    assert notification.title == "Container started"
+    assert notification.message == "Instance is running"
+    assert notification.source_type == "tool_instances"
+    assert notification.notification_metadata == {"key": "value"}
+    assert notification.read_at is None
+    assert notification.dismissed_at is None
+    assert notification.created_at is not None
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_list_notifications_orders_by_created_at_desc(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    n1 = await notification_service.create_notification(
+        db_session, user_a.id, category="instance", severity="info", title="First"
+    )
+    n1.created_at = datetime.now(timezone.utc) - timedelta(seconds=2)
+    await db_session.commit()
+    await db_session.refresh(n1)
+
+    n2 = await notification_service.create_notification(
+        db_session, user_a.id, category="instance", severity="info", title="Second"
+    )
+    n2.created_at = datetime.now(timezone.utc) - timedelta(seconds=1)
+    await db_session.commit()
+    await db_session.refresh(n2)
+
+    n3 = await notification_service.create_notification(
+        db_session, user_a.id, category="instance", severity="info", title="Third"
+    )
+
+    items, total = await notification_service.list_notifications(db_session, user_a.id)
+
+    assert total == 3
+    assert [item.id for item in items] == [n3.id, n2.id, n1.id]
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_list_notifications_excludes_dismissed(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    n1 = await notification_service.create_notification(
+        db_session, user_a.id, category="instance", severity="info", title="Visible"
+    )
+    n2 = await notification_service.create_notification(
+        db_session, user_a.id, category="instance", severity="info", title="Dismissed"
+    )
+    await notification_service.dismiss(db_session, n2.id, user_a.id)
+
+    items, total = await notification_service.list_notifications(db_session, user_a.id)
+
+    assert total == 1
+    assert items[0].id == n1.id
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_list_notifications_unread_only(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    n1 = await notification_service.create_notification(
+        db_session, user_a.id, category="instance", severity="info", title="Unread"
+    )
+    n2 = await notification_service.create_notification(
+        db_session, user_a.id, category="instance", severity="info", title="Read"
+    )
+    await notification_service.mark_read(db_session, n2.id, user_a.id)
+
+    items, total = await notification_service.list_notifications(
+        db_session, user_a.id, unread_only=True
+    )
+
+    assert total == 1
+    assert items[0].id == n1.id
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_get_unread_count(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    for i in range(5):
+        n = await notification_service.create_notification(
+            db_session,
+            user_a.id,
+            category="instance",
+            severity="info",
+            title=f"Notification {i}",
+        )
+        if i >= 3:
+            await notification_service.mark_read(db_session, n.id, user_a.id)
+
+    count = await notification_service.get_unread_count(db_session, user_a.id)
+
+    assert count == 3
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_mark_read_sets_read_at(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    n = await notification_service.create_notification(
+        db_session, user_a.id, category="instance", severity="info", title="Unread"
+    )
+
+    updated = await notification_service.mark_read(db_session, n.id, user_a.id)
+
+    assert updated.read_at is not None
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_mark_all_read_affects_all_unread(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    for i in range(4):
+        await notification_service.create_notification(
+            db_session,
+            user_a.id,
+            category="instance",
+            severity="info",
+            title=f"Notification {i}",
+        )
+
+    marked = await notification_service.mark_all_read(db_session, user_a.id)
+
+    assert marked == 4
+    count = await notification_service.get_unread_count(db_session, user_a.id)
+    assert count == 0
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_dismiss_sets_dismissed_at(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    n = await notification_service.create_notification(
+        db_session, user_a.id, category="instance", severity="info", title="To dismiss"
+    )
+
+    await notification_service.dismiss(db_session, n.id, user_a.id)
+
+    result = await db_session.execute(
+        select(Notification).where(Notification.id == n.id)
+    )
+    row = result.scalar_one()
+    assert row.dismissed_at is not None
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_mark_read_wrong_owner_raises(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+    user_b: User,
+) -> None:
+    n = await notification_service.create_notification(
+        db_session, user_a.id, category="instance", severity="info", title="Owned by A"
+    )
+
+    with pytest.raises(ValueError, match="Notification not found"):
+        await notification_service.mark_read(db_session, n.id, user_b.id)
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_dismiss_wrong_owner_raises(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+    user_b: User,
+) -> None:
+    n = await notification_service.create_notification(
+        db_session, user_a.id, category="instance", severity="info", title="Owned by A"
+    )
+
+    with pytest.raises(ValueError, match="Notification not found"):
+        await notification_service.dismiss(db_session, n.id, user_b.id)
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_list_notifications_mute_categories(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    await notification_service.create_notification(
+        db_session, user_a.id, category="instance", severity="info", title="Instance"
+    )
+    n2 = await notification_service.create_notification(
+        db_session, user_a.id, category="system", severity="info", title="System"
+    )
+
+    items, total = await notification_service.list_notifications(
+        db_session, user_a.id, mute_categories=["instance"]
+    )
+
+    assert total == 1
+    assert items[0].id == n2.id
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_get_unread_count_excludes_dismissed(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+) -> None:
+    n = await notification_service.create_notification(
+        db_session,
+        user_a.id,
+        category="instance",
+        severity="info",
+        title="Unread dismissed",
+    )
+    await notification_service.dismiss(db_session, n.id, user_a.id)
+
+    count = await notification_service.get_unread_count(db_session, user_a.id)
+
+    assert count == 0
+
+
+@pytest.mark.unit
+@pytest.mark.asyncio
+async def test_mark_all_read_affects_only_caller(
+    db_session: AsyncSession,
+    notification_service: NotificationService,
+    user_a: User,
+    user_b: User,
+) -> None:
+    for i in range(3):
+        await notification_service.create_notification(
+            db_session, user_a.id, category="instance", severity="info", title=f"A-{i}"
+        )
+    for i in range(2):
+        await notification_service.create_notification(
+            db_session, user_b.id, category="instance", severity="info", title=f"B-{i}"
+        )
+
+    marked = await notification_service.mark_all_read(db_session, user_a.id)
+
+    assert marked == 3
+    count_a = await notification_service.get_unread_count(db_session, user_a.id)
+    count_b = await notification_service.get_unread_count(db_session, user_b.id)
+    assert count_a == 0
+    assert count_b == 2