Add UserRepository.dashboard_row for single-row refresh

Extracts the dashboard_rows() loop body into a shared
_build_dashboard_row helper so a single rider's row can be re-queried
after a sync action, without changing dashboard_rows()'s behavior.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/db/repositories.py

@@ -67,16 +67,22 @@ class UserRepository:
         return user
 
     def dashboard_rows(self) -> list[UserDashboardRow]:
-        users = self.list_all()
+        return [self._build_dashboard_row(user) for user in self.list_all()]
-        rows = []
+
-        for user in users:
+    def dashboard_row(self, user_id: int) -> UserDashboardRow | None:
+        user = self.get(user_id)
+        if user is None:
+            return None
+        return self._build_dashboard_row(user)
+
+    def _build_dashboard_row(self, user: SyncUser) -> UserDashboardRow:
         last_run = self.session.scalar(
             select(SyncRun).where(SyncRun.user_id == user.id).order_by(SyncRun.started_at.desc()).limit(1)
         )
         last_activity = self.session.scalar(
             select(Activity).where(Activity.user_id == user.id).order_by(Activity.created_at.desc()).limit(1)
         )
-            rows.append(UserDashboardRow(
+        return UserDashboardRow(
             id=user.id,
             name=user.name,
             enabled=user.enabled,
@@ -85,8 +91,7 @@ class UserRepository:
             last_sync_at=last_run.finished_at if last_run else None,
             last_activity_name=last_activity.activity_name if last_activity else None,
             last_activity_status=last_activity.status.value if last_activity else None,
-            ))
+        )
-        return rows
 
     def dashboard_summary(self, *, since: datetime) -> DashboardSummary:
         rider_total = self.session.scalar(select(func.count()).select_from(SyncUser)) or 0

tests/db/test_repositories.py

@@ -207,3 +207,19 @@ def test_dashboard_summary_success_rate_is_none_without_finished_runs_in_window(
     summary = user_repository.dashboard_summary(since=datetime.now(timezone.utc) - timedelta(days=7))
 
     assert summary.success_rate_recent is None
+
+
+def test_dashboard_row_returns_row_for_known_user(user_repository) -> None:
+    user = _make_user(user_repository, "Alex")
+
+    row = user_repository.dashboard_row(user.id)
+
+    assert row is not None
+    assert row.id == user.id
+    assert row.name == "Alex"
+
+
+def test_dashboard_row_returns_none_for_unknown_user(user_repository) -> None:
+    row = user_repository.dashboard_row(999)
+
+    assert row is None