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TREK/server
Dieter Blomme dea5035fd9 feat(atlas): let a visited region be hidden, cascading to the country when none remain (server)
Countries already have a hide/tombstone mechanism (hidden_countries, #1490):
a zero-count derived country can be dismissed and stays gone across reloads.
Regions had no equivalent — unmarkRegionVisited only ever deleted a
manually-marked visited_regions row, a no-op for the common case of a region
derived fresh from place_regions on every request, so there was no way to
dismiss one at all (place-derived or otherwise).

Adds the region-level counterpart:
- New hidden_regions table (user_id, region_code, country_code), mirroring
  hidden_countries.
- getVisitedRegions() filters its result through it, the same way getStats()
  already filters through getHiddenCountries().
- unmarkRegionVisited() now tombstones unconditionally (not just for a
  manually-marked region — a region with a real place attached, e.g. one
  misassigned by a border-simplification gap, is exactly the case this
  exists for) and derives the country code from the region code's
  "<country>-<rest>" prefix when there's no visited_regions row to read it
  from.
- Cascade: after hiding a region, if the country has no other visible region
  left (checked against place_regions + visited_regions, minus hidden_regions),
  the country is hidden too via the existing unmarkCountryVisited.
- markRegionVisited() clears both tombstones on re-mark, so a region (and its
  cascade-hidden country) can come back.

Note the cascade only has a visible effect on a country with no real place
attached to it — getStats' places-derived country entries are never
suppressed by hidden_countries (#1490's deliberate "reappears with a real
place" rule), so hiding every region of a country that DOES have real places
leaves the country visible, by the same existing design. Test coverage
reflects this.

Server-side only — client wiring (a way to trigger this from the map) is a
separate commit.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-07-18 19:42:23 +02:00
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