Thanks Gary that is what I needed.  I copied that directory to another 
machine and the html doc files worked fine with the browser.  @vince I have 
periodically created backups but I haven't needed to use them up to now.  I 
will go through the process of restoring the existing database on a 
separate fresh install with more notes this time :)

BR
Patrick

On Monday, January 24, 2022 at 2:56:26 PM UTC-8 gjr80 wrote:

> Upgrading should be painless but the jump from 3.x to 4.x could have 
> consequences, can't say till you do it :)  If you are keen to stay on 3.9.1 
> you can still add extra fields to your database, the procedure is detailed 
> in the 3.9.1 Customization Guide, a copy of which you have on your 3.9.1 
> WeeWX install. Have a look in /usr/share/doc/weewx or /home/weewx/docs 
> (depending on how you installed WeeWX) on your 3.9.1 WeeWX machine and you 
> will find the 3.9.1 docs. customizing.htm is the document you want, in 
> particular the *Adding a new type to the database* section. The document 
> may be hard to read as it is a HTML file, you may be able to open directly 
> as a file in your browser or if you have a web server running on your WeeWX 
> machine you may be able to copy or link the file to your web server's 
> document path so you can browse the document through your web server.
>
> Gary
> On Tuesday, 25 January 2022 at 05:55:38 UTC+10 [email protected] wrote:
>
>> I'm just worried about breaking things with upgrading.
>>
>> On Monday, January 24, 2022 at 11:36:14 AM UTC-8 vince wrote:
>>
>>> That version is almost 3 years old. I'd suggest you simply upgrade to 
>>> the current version.
>>>
>>> The current weewx also has the wview_extended schema  (link 
>>> <https://raw.githubusercontent.com/weewx/weewx/master/bin/schemas/wview_extended.py>)
>>>  
>>> which has 'many' more fields defined.
>>> It's possible the ones you want to add are already defined in it.
>>>
>>>
>>>

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