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Add lifecycle error and privacy knowledge (#99)

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* Add lifecycle error and privacy knowledge

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 95c06ad8-377d-4faa-8d07-06300b1c81ec

* Fix lifecycle privacy review findings

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: a26cd6d6-ff49-433e-bc53-f645c455ebdd

* Refine lifecycle privacy retrieval

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 95c06ad8-377d-4faa-8d07-06300b1c81ec

* Make review gates explicit

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 95c06ad8-377d-4faa-8d07-06300b1c81ec

---------

Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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microsoft/knowledge/upgrade/install-code-does-not-run-on-version-upgrade.md Normal file
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---
bc-version: [all]
domain: upgrade
keywords: [install-codeunit, subtype-install, on-install-app, version-upgrade, upgrade-codeunit]
technologies: [al]
countries: [w1]
application-area: [all]
---
# Install code does not run during a version upgrade
## Description
An install codeunit runs when an extension is installed for the first time or an uninstalled version is installed again. Installing a higher extension version through the data-upgrade operation does not invoke `OnInstallAppPerCompany` or `OnInstallAppPerDatabase`. Ordinary version-to-version migration is dispatched only through upgrade codeunits.
## Best Practice
Use `Subtype = Install` for first-install and reinstall initialization. Put version migration in a separate `Subtype = Upgrade` codeunit and enter it from `OnUpgradePerCompany` or `OnUpgradePerDatabase`.
See sample: `install-code-does-not-run-on-version-upgrade.good.al`.
## Anti Pattern
Putting a schema or data migration only in an install trigger and expecting it to run when a higher app version is upgraded. The migration is never invoked on that path.
See sample: `install-code-does-not-run-on-version-upgrade.bad.al`.