[server] Migration to update sidebars to depend on parent for KNOW_OF
[server] Migration to update sidebars to depend on parent for KNOW_OF

Summary: This migration updates the database to reflect D1020

Test Plan: Run the migration and make sure the output looks good and the database looks right

Reviewers: palys-swm

Reviewed By: palys-swm

Subscribers: KatPo, Adrian, atul

Differential Revision: https://phabricator.ashoat.com/D1029

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