* update `Post` table schema and migration plan to index `type` column
* use `unsafeExecuteSql()` for adding index during migration
* Update SQL query to create index
Co-authored-by: Elias Nahum <nahumhbl@gmail.com>
* Update docs
* Remove `UNIQUE` from SQL query
Co-authored-by: Rahim Rahman <rahim.rahman@mattermost.com>
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Co-authored-by: Elias Nahum <nahumhbl@gmail.com>
Co-authored-by: Rahim Rahman <rahim.rahman@mattermost.com>
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