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PostgreSQL renders its messages in the server's lc_messages locale. _safe_execute
recognised an already-applied statement by searching the error text for
"already exists", so a Russian-locale server -- which says "уже существует" --
re-raised it and aborted startup.
The column already existing is the expected outcome: create_all() builds the
tables from the models before the migration list runs, so on a fresh database
essentially every ADD COLUMN in that list is a duplicate by design, and all 382
of them relied on that recognition. No PostgreSQL server outside an English
locale could start Bambuddy at all, fresh install or upgrade.
Classify on SQLSTATE instead -- 42701, 42P07, 42710, 23505 -- which PostgreSQL
never translates. The existing narrowing is kept and now rests on a code rather
than a phrase: a missing column counts as already-applied only for RENAME COLUMN,
so a missing column during ADD COLUMN or CREATE INDEX still aborts rather than
hiding a corrupt schema. SQLite keeps the text match; its driver publishes no
SQLSTATE and it does not localise. The OIDC auto-link constraint read message
text the same way and gets the same treatment.
Verified against PostgreSQL 15 under ru_RU, en_US and C: init_db() completes on
a fresh database and on a re-run in all three, and the schema the Russian server
ends up with is byte-identical to the English one.