Add index to AccessToken.token

[martin-thoma]

Description of the Change

I've noticed via Sentry performance monitoring on a (weak) staging machine that this query is slow:

SELECT "oauth2_provider_accesstoken"."id", "oauth2_provider_accesstoken"."user_id", "oauth2_provider_accesstoken"."source_refresh_token_id", "oauth2_provider_accesstoken"."token", "oauth2_provider_accesstoken"."id_token_id", "oauth2_provider_accesstoken"."application_id", "oauth2_provider_accesstoken"."expires", "oauth2_provider_accesstoken"."scope", "oauth2_provider_accesstoken"."created", "oauth2_provider_accesstoken"."updated", "core_user"."password", "core_user"."last_login", "core_user"."is_superuser", "core_user"."email", "core_user"."is_staff", "core_user"."is_active", "core_user"."date_joined", "core_user"."id", "oauth2_provider_application"."id", "oauth2_provider_application"."client_id", "oauth2_provider_application"."user_id", "oauth2_provider_application"."redirect_uris", "oauth2_provider_application"."post_logout_redirect_uris", "oauth2_provider_application"."client_type", "oauth2_provider_application"."authorization_grant_type", "oauth2_provider_application"."client_secret", "oauth2_provider_application"."name", "oauth2_provider_application"."skip_authorization", "oauth2_provider_application"."created", "oauth2_provider_application"."updated", "oauth2_provider_application"."algorithm" FROM "oauth2_provider_accesstoken" LEFT OUTER JOIN "core_user" ON ( "oauth2_provider_accesstoken"."user_id" = "core_user"."id" ) LEFT OUTER JOIN "oauth2_provider_application" ON ( "oauth2_provider_accesstoken"."application_id" = "oauth2_provider_application"."id" ) WHERE "oauth2_provider_accesstoken"."token" = % s ORDER BY "oauth2_provider_accesstoken"."id" ASC LIMIT 1 

Everything relevant besides "oauth2_provider_accesstoken"."token" has indices.

My DB knowledge is limited, but I guess adding an index to this field should make it faster. It's also not tiny:

>>> from oauth2_provider import models >>> models.AccessToken.objects.count() 40493 

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added - I don't know what/how to unittest this
• documentation updated - I don't think that is relevant
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS - I'm uncertain this deserves to be added

[martin-thoma]

Related to #146

That one was closed because d56ad55 "was already done", but I don't see the 0002_adding_indexes.py migration. So I guess it never went into master / was reverted?

[n2ygk]

Looks good. Thanks for this.

I always get nervous when we add new auto-migrations because there's hand-coded stuff to facilitate swappable models, but I think this one will be OK since it doesn't change the schema.

[codecov]

Codecov Report

Merging #1312 (b42fa6d) into master (a4ae1d4) will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #1312 +/- ## ======================================= Coverage 97.37% 97.37% ======================================= Files 32 32 Lines 2022 2022 ======================================= Hits 1969 1969 Misses 53 53 

Files Changed	Coverage Δ
oauth2_provider/models.py	98.55% <ø> (ø)

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