* [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.
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