Re: How to ensure a log-entry is created based on state of data in other tables

From: Andreas Joseph Krogh <andreas(at)visena(dot)com>
To: Steve Midgley <science(at)misuse(dot)org>
Cc: pgsql-sql(at)lists(dot)postgresql(dot)org
Subject: Re: How to ensure a log-entry is created based on state of data in other tables
Date: 2023-02-09 16:33:07
Message-ID: VisenaEmail.6a.d3040d504876c082.1863705b248@visena.app.internal.visena.net
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På torsdag 09. februar 2023 kl. 16:08:16, skrev Steve Midgley <
science(at)misuse(dot)org <mailto:science(at)misuse(dot)org>>:

[…]

What is the time window required for "DONE" and "NOT_DONE" to be correct? Do
they need to be atomic (meaning the time window is effectively 0)? Or can the
system "notice" recent changes and keep track of done/not done after-the-fact?
If your time window is > 0, it seems like recurring processes could be set up
to track DONE / NOT_DONE?

Another totally different way to think about this is to create a view that
provides answers on DONE and NOT_DONE as computed values based on the
underlying state of the table at the time the view is queried? That would seem
to satisfy a time window of 0?

Steve
Yes, they need to be atomic. Either all are DONE and there is an entry in
activity_product_log for product_id, or there is no entry in
activity_product_log.

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Andreas Joseph Krogh
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