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* [WiP] Add documentation about index corruption Add documentation about index corruption caused by changes in collation rules, and information on how to fix it. * Add doc on how to check indexes Add documentation on how to check indexes without bringing the instance down. * Update index-corruption.md * fixup typo * Add instructions for re-creating the database * Add minor explanations * Remove recommendation to re-create database with C collation Meaningful case-folding operations are used within the database for hashtags, so do not recommend using `C`, which would cause issues with non-ASCII hashtags.