I tested dropping a couple of columns like that and started getting errors:

such as:

Traceback (most recent call last):
  File "/home/weewx/bin/weewx/reportengine.py", line 202, in run
    obj.start()
  File "/home/weewx/bin/weewx/reportengine.py", line 285, in start
    self.run()
  File "/home/weewx/bin/weewx/imagegenerator.py", line 41, in run
    self.genImages(self.gen_ts)
  File "/home/weewx/bin/weewx/imagegenerator.py", line 180, in genImages
    aggregate_interval=aggregate_interval)
  File "/home/weewx/bin/weewx/xtypes.py", line 91, in get_series
    raise weewx.UnknownType(obs_type)
weewx.UnknownType: radiation


radiation was a field I knew I would never use.  Before I dropped anything 
I dumped the database so was easy to put the columns back in including most 
of the data.

So I was convinced there was more to this that simply dropping columns from 
the database.

This was where I knew I was in deep over my head.

On Thursday, February 13, 2020 at 4:54:46 PM UTC-6, ed100 wrote:
>
> I have the Belchertown skin with MQTT running nicely after some serious 
> help from folks here.
> There are a bunch of fields in the weewx mariadb database that I will 
> never use.  I did some searching to how to do this but didn't find out how. 
> I don't want to damage things, just clean up unnecessary fields. (old 
> habits...)
> I did grab the extraTemp1 and use it to show the cpu temp on the weewx 
> raspberry.
>
> Thanks
>

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