One row per offer × provider. Slevomat is the reference — Booking.com is monitored as one more provider alongside Provider 1–3. Rank is by total price across every provider that had the room bookable (1 = cheapest); vs Slevomat is negative when that provider undercuts us. Every column filter is a dropdown in the header; click a row for its price history.
Numeric filters accept comparisons — type 5 or =5,
>3, >=3, <=10, !=2, or empty /
!empty to isolate blanks. Rank columns use a dropdown with an explicit (none) entry.
Blank values always sort to the bottom.
cheapest provider (rank 1) most expensive provider Slevomat — our own channel, also marked *