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open_user_pool ran only the key probe, so ensure_column never reached
pre-existing {userid}.db files: users created before an additive column
(e.g. chat_sessions.is_open) was introduced hit 'no such column' at
their next login. create_owner_tables is idempotent, so running it at
unlock lands additive changes per user, at the only moment an encrypted
file is readable.