Weeks come from the fixture’s own week number where it is recorded and from the fixture id where it is not, which covers the 531 rows that carry no metadata at all; the two agree on every row that has both. The regular season is 17 weeks through 2020 and 18 from 2021, so the boundary between a late regular-season week and the wild-card round moves with the season rather than sitting at a fixed number. Playoff weeks are labelled by round. 2026 is on record with 272 fixtures and no playoff round scheduled yet, so its later weeks are absent rather than empty. Kickoff times are not stored, only dates, which is why fixtures are grouped by day and not ordered within it.