policy_view

Return the policy page header: the policy, its revisions and the viewed revision.

Code
One read for what the classic page asked with five calls on every revision load (policy number and data,
revisions, revision, agent email info and the page permissions). It writes nothing: the "policy opened" alert
and the credit score check are `record_view`.

Parameters
----------
params : dict
    ``policy_id`` (str, required) and ``revision_id`` (str, optional). A revision id that names no live revision
    of the policy falls back to the current revision, then to the newest.

Returns
-------
dict
    ``policy``, ``revisions`` (oldest first), ``current_revision_id``, ``revision`` (the viewed one, with its
    status, premiums, tags, external system link and, while ``lines/erp-enabled`` is on, its ERP items),
    ``agent_emails`` and ``permissions`` (the ``britecore/policies`` page sections).

Record that the user opened the policy page or switched to another revision.

Code
On page open (``page_open``) it schedules the "policy opened" event alert and returns the fired alerts, marking
them shown, unless ``skip_alerts`` (the classic ``noAlertCheck``) is set. On every call it runs the credit score
check of the viewed revision (setting ``contacts/auto-fetch-credit-score``).

Parameters
----------
params : dict
    ``policy_id`` (str), ``revision_id`` (str), ``page_open`` (bool) and ``skip_alerts`` (bool).

Returns
-------
dict
    ``alerts``: ``title``, ``contents`` (the note's HTML) and ``date`` of each alert to show.