Draft: Document schema change limitations
What does this MR do and why?
As tables get larger, we're considering adding new limitations on some actions, with exceptions.
- Adding a new index or foreign key may only be done on tables under 50gb
- Adding a new column may only be done on tables under 100gb
This change will be paired with enforcement in the gitlab-com-database-testing project, as well as alerting to teams that have tables in that state.
Related to: gitlab-org/database-team/gitlab-com-database-testing#161 Data: https://gitlab.com/gitlab-org/gitlab/-/issues/477398#note_2120901973 (internal)
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Edited by Alex Ives