<!-- Add the related story/sub-task/bug number, like Resolves#123, or
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**Related issue:** Resolves#44188
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
## Database migrations
- [x] Checked schema for all modified table for columns that will
auto-update timestamps during migration.
- [x] Confirmed that updating the timestamps is acceptable, and will not
cause unwanted side effects.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Windows MDM check-in response payloads are now stored gzip-compressed
in the database to reduce write pressure for large SyncML data.
* When fetching results, responses are automatically decompressed so the
original content is returned to clients.
* Empty payloads are preserved, and stored data is validated to ensure
only valid gzip content is accepted.
* **Database / Migration**
* Added a migration and backfill to move existing records from
uncompressed storage to the new compressed column format.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Victor Lyuboslavsky
a019cfb8f4