[2026] relax versioncheck to major versions

apps/rooms/migrations/0028_room_instance_build.sql

@@ -0,0 +1,18 @@
+-- A room instance's `gameVersion` is now a BUILD — the bare `YYYYMMDD` — rather than the
+-- client's full version. The `.NN` after the date is a same-day point release of the
+-- same build: it changes nothing a session keys on, so `20250718.01` and `20250718.2`
+-- belong in one Photon room, and `SUPPORTED_GAME_VERSIONS` lists dates alone.
+--
+-- Matchmaking now stamps the build (createRoomInstance runs the value through
+-- `gameBuild`) and every lookup normalizes its argument the same way, so a row still
+-- carrying `20250718.01` would match NOBODY from here on: a 20250718 player's search is
+-- `game_version = '20250718'`. Strip the point release off every live row so the sessions
+-- open at the moment of the deploy stay joinable. Rows with no `.` (already bare, or the
+-- NULL of a row older than the stamp) are left exactly as they are.
+--
+-- `game_version` is a virtual column over the `data` blob (0012), so the blob is what's
+-- rewritten; the column follows.
+
+UPDATE room_instance
+   SET data = json_set(data, '$.gameVersion', substr(game_version, 1, instr(game_version, '.') - 1))
+ WHERE game_version LIKE '%.%';