Retrieve delivered service hours for a line over a date range.

Parameters for the /api/service_hours endpoint.

Attributes: line_id: Optional line filter. None returns all lines. start_date: Start of date range. end_date: End of date range. agg: Aggregation level — daily, weekly, or monthly.

Response for /api/service_hours — scheduled vs. delivered service hours.

Attributes: data: Service hours comparison data.