Creates availability schedule for an artist
ID of the artist this availability belongs to
Weekly schedule with days as keys (e.g., 'Sunday', 'Monday')
Type of date range for this availability
indefinitely, specific, rolling UTC timestamp in milliseconds when this availability becomes effective
Optional UTC timestamp in milliseconds when this availability ends
Optional number of days to roll over when dateRangeType is 'rolling'
Availability created successfully
Whether the operation was successful