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ALTER command denied
If you see an error message like this
ALTER command denied to user 'USERNAME'@'DBHOST' for table 'nextend2_section_storage' ALTER TABLE `nextend2_section_storage` DROP INDEX `application`
that means the database user doesn't have the right to run the Alter queries. Alter queries are is a commonly used MySQL codes, so it should be allowed to run them. You should contact your server host and ask them to check the database user's permission, and make sure that it has the right to alter tables.