Update reserved campaign

Fully replace an existing reserved campaign with the provided data. All required fields must be provided.

Important: ID handling for flights and ads

• The campaign id is required and must match the path parameter.
• Flights and ads with an id: Will be updated in-place if the ID exists.
• Flights and ads without an id: Will be created as new entities with auto-generated IDs.
• Existing flights and ads not included in the request: Will be deleted.

This means the PUT operation performs a full replacement of the reserved campaign structure. To preserve existing flights or ads, you must include them in the request with their respective IDs.