# What this PR does
- Stops writing `SlackMessage.organization` + removes references to this
field. [As we
discussed](https://raintank-corp.slack.com/archives/C083TU81TCH/p1733315887463279?thread_ts=1733311105.095309&cid=C083TU81TCH),
we do not need this field on this model/table,
`SlackMessage._slack_team_identity` is sufficient (`organization` will
be dropped in a separate PR)
- Adds a data migration script which:
- drops orphaned `SlackMessage` records; ie. ones which, even after the
[`engine/apps/slack/migrations/0007_migrate_slackmessage_channel_id.py`](https://github.com/grafana/oncall/blob/dev/engine/apps/slack/migrations/0007_migrate_slackmessage_channel_id.py)
migration, still don't have a `SlackMessage.channel` id filled in (we
discussed + agreed on dropping these records
[here](https://raintank-corp.slack.com/archives/C083TU81TCH/p1733329914516859?thread_ts=1733311105.095309&cid=C083TU81TCH))
- fills in empty `SlackMessage.slack_team_identity` values (from
`slack_message.channel.slack_team_identity`)
### Other notes
On the `organization` topic.
We store records in `SlackMessage` for two purposes (AFAICT), and in
both cases, we have references back to the `organization`:
- alert groups - `slack_message.alert_group.channel.organization`
- shift swap requests - `shift_swap_request.schedule.organization`
## Checklist
- [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.
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