**Related issue:** Resolves#47713
- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements), JS
inline code is prevented especially for url redirects, and untrusted
data interpolated into shell scripts/commands is validated against shell
metacharacters.
## 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.
- [x] Ensured the correct collation is explicitly set for character
columns (`COLLATE utf8mb4_unicode_ci`).
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added support for tracking available Apple OS update assets and
supported devices.
* Added per-host Apple OS update targets, deadlines, and resolution
status.
* Added configuration options for host target OS versions and deadlines.
* **Database**
* Updated the MySQL schema and migration seed data to include the new
tables and fleet variables, and to reflect updated migration/status
metadata.
* **Tests**
* Added migration tests to validate table creation, constraints,
defaults, and upsert behavior.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Andrew Mellor
f1228c873d