mod_compat_roles: Fix attempt to index a nil value #1847 permissions[] is not a map with role names as keys since 817bc9873fc2 but instead a level with host names were added. This was likely an oversight. Refactored towards railroad.

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This module blocks configured queries that change server state.

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E.g. to make vCard storage read-only:

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``` lua

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readonly_stores = {

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	vcard = { "vcard-temp", "vCard" };

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}

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```