Thanks for tip, Gary. I ran wee_config_database —drop-daily and saw this 
evidence in the log on weewxd startup:

Sep  8 21:05:39 seal weewx[14232]: engine: Starting backfill of daily 
summaries
Sep  8 21:12:27 seal weewx[14232]: engine: Processed 1116765 records to 
backfill 1631 day summaries in 408.15 seconds

but it did not pick up my new drastically lower pressure. Then I realized 
the statistics are actually on pressure, not the barometer reading. I might 
be putting the reading from my pressure sensor in the wrong field. Again, 
in the short term, I fabricated pressure readings by finding a suitable 
linear adjustment to convert barometer to pressure from nearby readings 
with both, and updated the archive table where pressure was NULL for the 
three emergency readings:

update archive set pressure = 0.992657*barometer where dateTime between 
1567895340 and 1567905540;

Then dropped the summaries again, and restarted weewxd. The statistics page 
now shows my new all time low *pressure*. I wouldn't say science has 
marched on. That will have to wait for our next hurricane.


On Sunday, 8 September 2019 11:56:27 UTC-3, gjr80 wrote:
>
> Dropping the daily summaries is generally taken to mean using one of the 
> WeeWX utilities to drop the daily summaries rather than using SQL directly. 
> The current utility used to manage the database is wee_database; however, 
> in v3.1.0 the utility is wee_config_database. Try running 
> wee_config_database with the —drop-daily action (using —help will display 
> the list of available actions). 
>
> You can also use wee_config_database to rebuild the daily summaries using 
> the -backfill-daily action. 
>
> Gary

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