Did you try to find anything related in Trac? Maybe 

I use this query in Google: postgresql unique index 

On Friday, September 16, 2016 at 9:51:13 AM UTC-4, Dilyan Palauzov wrote:
> Hello, 
> according to the documentation models.ForeignKeys creates implicitly an 
> index on the underlying database. 
> Wouldn't it be reasonable to change the default behaviour to only create 
> implicit index, if there is no index_together or unique_together starting 
> with the name of the foreign key?   In such cases the implicit index is 
> redundant, at least with Postgresql, as the value can be found fast using 
> the _together index. 
> Greetings 
>    Dilian 

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