How might I review all staff posts and comments published since late September?
If that's not possible, then how about just the posts?
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It's hard enough already to generate a list of staff members, but I guess you could use the API to get a list of recent posts and recent comments (those calls support pagination). For each new 100 user IDs you encounter, request the complete user record. Those contain an
is_employee field, indicating whether a user is a staff member or not. This might be doable before running out of your daily API quota (10000 if you have a registered Stack App).
It's not possible to make a SEDE query for this, since whether a user is an employee or not isn't stored there. But, if you have a list of user IDs, it's doable.
Here is a list of posts since September 28th:
and here a list of comments: