>   When I use a SlugField in a model,
> an index for this field is create in postgres.
>
>   Why ?

Indexing a fields makes searches over that field faster. Slug fields
are the very definition of a searchable, indexable field -  the most
common use case for a Slug is as part of a URL scheme. So, Django
installs an index for each Slug field by default.

Yours,
Russ Magee %-)

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