Add sharding_key for member_roles table
What does this MR do and why?
It DB docs of the member_roles
table to use gitlab_main_cell
and also adds sharding key for the table, documentation.
A follow-up issue for resolving the sharding_key issue was created - on SaaS namespace_id
should be always present but on self-managed it is NULL
.
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Edited by Jarka Košanová