Create or update campaign timetables (dayparting).

Create or update dayparting configuration for a campaign.

Dayparting allows you to control when your campaign is active during the week. You can specify active hours for each day of the week (1=Monday, 7=Sunday).

HOUR SEMANTICS:

• start_hour: Campaign starts at this hour (inclusive, 0-23)
• end_hour: Campaign stops at this hour (exclusive, 1-24)
• Example: start_hour=9, end_hour=17 runs from 9:00 AM to 5:00 PM
• For all-day: start_hour=0, end_hour=24

This endpoint performs an upsert operation - it will create new timetables or update existing ones based on the day_of_week. Days not in the request remain unchanged.