Yes, the reports can be backfilled starting from January 2018. Please note that some v5 fields may not be available for past periods (e.g. lowestPrice on the search level).
We are glad to report that the Travel Insights report issue is now resolved.
The PriceCustomCurrency column was missing from some reports between 26/06/2025 and 30/06/2025.
A fix has been implemented and updated reports for this period are being re-sent to all partners.
If you need assistance, please reach out using partnersupport@skyscanner.net