Upgrade to Nextcloud Hub 10 (31.0.0) Incorrect row format found in your database

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This worked for me.

source .env # assumed: contains MYSQL_ROOT_PASSWORD
DBCONTAINER=nextcloud-db #based on your compose.yaml
DBNAME=nextcloud #based on your compose.yaml

docker exec -i $DBCONTAINER mariadb -u root -p$MYSQL_ROOT_PASSWORD -N -e "
  SELECT CONCAT('ALTER TABLE ', TABLE_NAME, ' ROW_FORMAT=DYNAMIC;')
  FROM information_schema.tables
  WHERE table_schema = '$DBNAME' AND ROW_FORMAT != 'Dynamic';" \
| docker exec -i $DBCONTAINER mariadb -u root -p$MYSQL_ROOT_PASSWORD $DBNAME