Update from 5.4.2.2 -> 5.5.1 || Unexpected Error

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Hello,

After the upgrade i get this error message:
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An Unexpected Error occurred while upgrading: mysql error: [1142: INDEX command denied to user 'SQLUSER-XYZ'@'localhost' for table 'CollectionVersionBlocks'] in EXECUTE("DROP INDEX cbIncludeAll ON CollectionVersionBlocks").
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After reloading i see this instead of my website:
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mysql error: [1054: Unknown column 'Pages.cIsActive' in 'field list'] in EXECUTE("select Pages.cID, Pages.pkgID, Pages.cPointerID, Pages.cPointerExternalLink, Pages.cIsActive, Pages.cIsSystemPage, Pages.cPointerExternalLinkNewWindow, Pages.cFilename, Collections.cDateAdded, Pages.cDisplayOrder, Collections.cDateModified, cInheritPermissionsFromCID, cInheritPermissionsFrom, cOverrideTemplatePermissions, cPendingAction, cPendingActionUID, cPendingActionTargetCID, cPendingActionDatetime, cCheckedOutUID, cIsTemplate, uID, cPath, Pages.ctID, ctHandle, ctIcon, ptID, cParentID, cChildren, ctName, cCacheFullPageContent, cCacheFullPageContentOverrideLifetime, cCacheFullPageContentLifetimeCustom from Pages inner join Collections on Pages.cID = Collections.cID left join PageTypes on (PageTypes.ctID = Pages.ctID) left join PagePaths on (Pages.cID = PagePaths.cID and PagePaths.ppIsCanonical = 1) where Pages.cID = 1")
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I "fixed" this problem by removing the "update code" from site.php

Does anyone know how i can update C5?
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j0nas