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fleet/server/mdm/android
Victor Lyuboslavsky e790260b85 Android commands backend (#46031)
<!-- Add the related story/sub-task/bug number, like Resolves #123, or
remove if NA -->
**Related issue:** Resolves #41683 

Support for Android lock, wipe, and clear passcode commands. Behavior is
slightly different between BYOD and CODO. The fleetdm.com proxy isn't
wired up, so they only work with direct Google connection.

# 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`.

## Testing

- [x] Added/updated automated tests
- [x] Where appropriate, [automated tests simulate multiple hosts and
test for host
isolation](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/reference/patterns-backend.md#unit-testing)
(updates to one hosts's records do not affect another)

- [x] QA'd all new/changed functionality manually

## Database migrations

- [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**
* Clear-passcode CLI plus Android Lock and Wipe commands (Wipe
restricted to company-owned devices).
* BYO unenroll now removes only the work profile, preserving personal
data.
* Commands issued with a 10-year duration; UI/CLI show Android-specific
messaging and command IDs.

* **Improvements**
* Host MDM pages reflect command lifecycle transitions (pending →
acknowledged or error with code/message) via Pub/Sub updates.

* **Documentation**
* Updated docs for Android MDM commands, ownership rules, and command
duration.

* **Tests**
  * New unit and integration tests for Android MDM flows.

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The MDM Android package attempts to decouple Android-specific service and datastore implementations from the core Fleet server code.

Any tightly coupled code that needs both the core Fleet server and the Android-specific features must live in the main server/fleet, server/service, and server/datastore packages. Typical example are MySQL queries. Any code that implements Android-specific functionality should live in the server/mdm/android package. For example, the common code from server/datastore package can call the android datastore methods as needed.

This decoupled approach attempts to achieve the following goals:

  • Easier to understand and find Android-specific code.
  • Easier to fix Android-specific bugs and add new features.
  • Easier to maintain Android-specific feature branches.
  • Faster Android-specific tests, including ability to run all tests in parallel.