[x] Unit, integration, and e2e (if applicable) tests updated
[x] Documentation added (or pr:no public docs PR label added if not required)
[x] Added the relevant release notes label (see labels prefixed w/ release:). These labels dictate how your PR will
show up in the autogenerated release notes.
What this PR does
AlertGroupPostMortem
has no references in the codebase.. I stumbled across it while working on https://github.com/grafana/oncall/pull/5224 and decided to just remove itVARCHAR
columns; these were refactored to foreign key references toslack_slackchannel
table in following PRs:Checklist
pr:no public docs
PR label added if not required)release:
). These labels dictate how your PR will show up in the autogenerated release notes.