improve hypothetical query

posts/2024-05-19.md

@@ -387,16 +387,19 @@ We're going to start with something we haven't introduced yet, but it's a view w
 -- All seconds within the past 24 hours.
 CREATE VIEW moments AS
 SELECT generate_series(
-    '1970-01-01 00:00:00+00', 
-    '2099-01-01 00:00:00+00', 
+    now() - '1 day'::interval + '1 second'::interval,
+    now(),
     '1 second'
-) moment
-WHERE now() BETWEEN moment AND moment + '1 day';
+) moment;
 ``` 
 
 Unpacking this, `moments` contains rows with a single column containing a timestamp.
-Whenever we look at it, the view contains those timestamps less or equal to `now()`, but at most three hours less.
-It should have at any moment exactly 86,401 records present (SQL's `BETWEEN` is inclusive), roughly as many as `auctions` up above.
+Whenever we look at it, the view contains those timestamps less than or equal to `now()`, but at most one day less.
+It should have at any moment exactly 86,400 records present, as many as `auctions` up above.
+
+Importantly, this view definition will not actually work for us.
+You are welcome to try it out, but you'll find out that while it can be *inspected*, it cannot be *maintained*.
+We'll fix that by the end of the post.
 
 These moments are not auction data, though.
 How do we get from moments to auctions and bids?