Look into how to optimize queries in add_and_remove method

[pulpbot]

Author: @ipanova (ipanova@redhat.com)

Redmine Issue: 8570, https://pulp.plan.io/issues/8570

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It is used in push api and it will be great to find bottlenecks if any.

[pulpbot]

From: @ipanova (ipanova@redhat.com)
Date: 2021-05-05T11:59:40Z

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worth looking into this also https://pulp.plan.io/issues/5823 (#460)