In PhpStorm 2.1 “Find Usages” (Alt+F7) results for tables and columns include database schema usages, i.e. references in indices, primary and foreign keys, see screenshot below:

Develop with pleasure!
Note: since WebStorm doesn’t support working with Databases there is no such feature in WebStorm.
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Note: if using for projects which use all zero’s in timestamps, make sure to use the advanced settings and set zeroDateTimeBehavior to convertToNull