Chat reform: - use consistently package_id to model belonging of a chat object to a particular package instead of the context_id - set con…
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Chat reform: - use consistently package_id to model belonging of a chat object to a particular package instead of the context_id - set context_id to the package_id, as was already the case in practice, for permission checking - make sure package_id exists and set it to the context_id in case it doesn't to handle legacy installations
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