v1.4.25 W7 phase 1 — adds AppSettings.defaultUserTimezone for the
per-user-timezone feature (Option B from
.planning/feature-user-timezone.md §4).
User.timezone already exists in the schema as a NOT NULL column with
'Europe/Berlin' default — it is the canonical per-user display zone
and needs no change. The only new piece is the server-wide default
for new accounts that don't carry a browser-detected zone in the
registration payload. Nullable so the resolver can fall back to
'Europe/Berlin' on every existing instance without an admin touching
anything.
Forward-only ALTER TABLE ADD COLUMN, no NOT NULL, no rename, no drop.
Marc-André Bombeck
7a27390936