02.52.25.sql used `DROP COLUMN IF EXISTS` (MariaDB-only), which errors on
Oracle MySQL 8.x — so on MySQL 8 installs the 26 legacy remote_storage/ftp_*/
sftp_*/gdrive_*/s3_* columns were never dropped, yet Joomla recorded the schema
as applied (confirmed on suite.dev: MySQL 8.0.41, all 26 columns still present,
0 profiles with legacy remote data).
New 02.56.01 migration removes them portably: an INFORMATION_SCHEMA-gated
prepared-statement ALTER that drops all 26 columns where present (plain
DROP COLUMN, valid on MySQL 8 + MariaDB) and is a no-op where already gone
(so it's safe on already-migrated installs too). Validated non-destructively
against suite.dev (gate=1, ALTER PREPAREs cleanly).
Claude-Session: https://claude.ai/code/session_01WbGBN9VyRK61zczYWcCQ2i