Fix big_gap_in_service in GTFS

Diagnosis

What this notice means

The calendar for the reported serviceId has a long break between active dates.

Operational effect

This may be an intentional seasonal break or a missing part of the timetable.

Scope

Report field	Type	Meaning
`gapDurationDays`	number	The number of days in the gap.
`gapEndDate`	string	The last day of the gap.
`gapStartDate`	string	The first day of the gap.
`serviceId`	string	The service_id that has the gap.

Repair

1
Check the reported gap against calendar.txt and the added or removed dates in calendar_dates.txt.
2
Restore missing service dates if the service should run. Keep an intentional break; do not add departures that are not operated.
3
Check the result
After a repair, rebuild the archive and validate it again. Confirm that the affected records are correct and that no new related notices appeared. A reviewed warning or informational notice may remain when it describes intentional, supported data.

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Sources