Here is the help command output, where it is listed as an option (my bold 
added):

pi@raspberrypi:/etc/weewx $ wee_database --help
Usage: wee_database --help
       wee_database --create-archive
            [CONFIG_FILE|--config=CONFIG_FILE]
            [--binding=BINDING_NAME]
       wee_database --drop-daily
            [CONFIG_FILE|--config=CONFIG_FILE]
            [--binding=BINDING_NAME]
       wee_database --backfill-daily
            [CONFIG_FILE|--config=CONFIG_FILE]
            [--binding=BINDING_NAME]
            [--trans-days=DAYS]
       wee_database --reconfigure
            [CONFIG_FILE|--config=CONFIG_FILE]
            [--binding=BINDING_NAME]
       wee_database --string-check
            [CONFIG_FILE|--config=CONFIG_FILE]
            [--binding=BINDING_NAME] [--fix]
       wee_database --transfer
            [CONFIG_FILE|--config=CONFIG_FILE]
            [--binding=BINDING_NAME]
            --dest-binding=BINDING_NAME
            [--dry-run]

Description:

Configure the weewx databases. Most of these functions are
handled automatically by weewx, but they may be useful in special cases.

Actions:

--create-archive  Create the archive database and initialize it with the 
schema.
--drop-daily      Drop the daily summaries from the database.
--backfill-daily  Rebuild the daily summaries from the archive database.
--reconfigure     Create a new database using the schema in the 
configuration file.
                  Copy over data from the old database.
--string-check    Scan the archive database, looking for null strings that 
may have
                  been introduced by a SQL editing program.
--transfer        Move data from one database to another.

Options:
  -h, --help            show this help message and exit
  --config=CONFIG_FILE  Use configuration file CONFIG_FILE.
  --create-archive      Create the archive database.

*  --drop-daily          Drop the daily summary tables from a database.  
--backfill-daily      Backfill a database with daily summaries.*
  --reconfigure         Create a new archive database using configuration
                        information found in the configuration file. In
                        particular, the new database will use the unit 
system
                        found in option [StdConvert][target_unit]. The new
                        database will have the same name as the old 
database,
                        with a '_new' on the end.
  --string-check        Check a sqlite version of the archive database to 
see
                        whether it contains embedded strings.
  --fix                 Fix any embedded strings in a sqlite database.
  --transfer            Transfer the weewx archive from source database to
                        destination database.
  --binding=BINDING_NAME
                        The data binding. Default is 'wx_binding'.
  --dest-binding=BINDING_NAME
                        The destination data binding.
  --dry-run             Print what would happen but do not do it.
  --trans-days=DAYS     Limit backfill transactions to no more than DAYS 
days
                        of archive data at a time. Default value is 5. May 
be
                        increased for a slight speed increase or reduced to
                        reduce memory usage.

If you are using a MySQL database it is assumed that you have the 
appropriate
permissions for the requested operation.
pi@raspberrypi:/etc/weewx $ 


On Sunday, 10 March 2019 12:02:13 UTC+2, gjr80 wrote:
>
> Hi,
>
> Can you please tell us what WeeWX version you are using? You can find the 
> WeeWX version number in the log when you start WeeWX, in 
> /etc/weewx/weewx.conf or by using the following command:
>
> $ /usr/share/weewx/weewxd -v
>
>
> Gary
>
> On Sunday, 10 March 2019 19:24:10 UTC+10, Bernard Boelema wrote:
>>
>> I had some impossibly high wind values which I deleted, but they still 
>> exist in the yearly graph. I wanted to rebuild the daily summaries for 
>> these days, but it comes back with the following:
>>
>> pi@raspberrypi:/etc/weewx $ wee_database --rebuild-daily --date=2019-02-23
>>
>> ..
>> ..
>> wee_database: error: no such option: --rebuild-daily
>>
>>
>> even though it is listed in the help ( wee_database --help) and on the 
>> website.
>>
>

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