I wanted to fiddle with my graphs so I could see dewpoint both inside and 
outside.  I found the value to plot, but
that failed (log below).
        [[[dayhumidity]]]
            [[[[inTemp]]]]
            [[[[inHumidity]]]]
#           [[[[inDewpoint]]]]
#             label = Cavern Dewpoint

   inDewpoint is listed in the calculations in the config file:
[StdWXCalculate]
    [[Calculations]]
        dewpoint   = prefer_hardware
        inDewpoint = prefer_hardware

and I can see the code that would generate the value here:
/home/weewx> egrep "(calc_inDewpoint|calc_dewpoint)" `find . -type f -name 
"*.py" -print`
./bin/weewx/wxservices.py:    def calc_dewpoint(self, data, data_type):  # 
@UnusedVariable
./bin/weewx/wxservices.py:    def calc_inDewpoint(self, data, data_type):  
# @UnusedVariable

Where it seems to be missing is in the schema:
weewx> egrep "(Dewpoint|dewpoint)" `find . -type f -name "*.py" -print`
./bin/schemas/wview.py:          ('dewpoint',             'REAL'),

How does one go about adding this?

Thx, Chris

Jan 22 05:57:59 router weewx[5212]: manager: added record 2018-01-22 
05:50:00 PST (1516629000) to database 'weewx.sdb'
Jan 22 05:57:59 router weewx[5212]: manager: added record 2018-01-22 
05:50:00 PST (1516629000) to daily summary in 'weewx.sdb'
Jan 22 05:58:00 router weewx[5212]: cheetahgenerator: Generated 6 files for 
report StandardReport in 0.22 seconds
Jan 22 05:58:00 router weewx[5212]: reportengine: Caught unrecoverable 
exception in generator weewx.imagegenerator.ImageGenerator
Jan 22 05:58:00 router weewx[5212]:         ****  no such column: inDewpoint
Jan 22 05:58:00 router weewx[5212]:         ****  Traceback (most recent 
call last):
Jan 22 05:58:00 router weewx[5212]:         ****    File 
"/home/weewx/bin/weewx/reportengine.py", line 238, in run
Jan 22 05:58:00 router weewx[5212]:         ****      obj.start()
Jan 22 05:58:00 router weewx[5212]:         ****    File 
"/home/weewx/bin/weewx/reportengine.py", line 271, in start
Jan 22 05:58:00 router weewx[5212]:         ****      self.run()
Jan 22 05:58:00 router weewx[5212]:         ****    File 
"/home/weewx/bin/weewx/imagegenerator.py", line 31, in run
Jan 22 05:58:00 router weewx[5212]:         ****      
self.genImages(self.gen_ts)
Jan 22 05:58:00 router weewx[5212]:         ****    File 
"/home/weewx/bin/weewx/imagegenerator.py", line 141, in genImages
Jan 22 05:58:00 router weewx[5212]:         ****      
aggregate_interval=aggregate_interval)
Jan 22 05:58:00 router weewx[5212]:         ****    File 
"/home/weewx/bin/weewx/manager.py", line 496, in getSqlVectors
Jan 22 05:58:00 router weewx[5212]:         ****      aggregate_type, 
aggregate_interval)
Jan 22 05:58:00 router weewx[5212]:         ****    File 
"/home/weewx/bin/weewx/manager.py", line 742, in _getSqlVectors
Jan 22 05:58:00 router weewx[5212]:         ****      for _rec in 
_cursor.execute(sql_str, (startstamp, stopstamp)):
Jan 22 05:58:00 router weewx[5212]:         ****    File 
"/home/weewx/bin/weedb/sqlite.py", line 37, in guarded_fn
Jan 22 05:58:00 router weewx[5212]:         ****      raise 
weedb.OperationalError(e)
Jan 22 05:58:00 router weewx[5212]:         ****  OperationalError: no such 
column: inDewpoint
Jan 22 05:58:00 router weewx[5212]:         ****  Generator terminated
Jan 22 05:58:00 router weewx[5212]: reportengine: copied 0 files to 
/home/weewx/public_html.weather
Jan 22 05:59:59 router weewx[1033]: manager: added record 2018-01-22 
05:55:00 PST (1516629300) to database 'weewx_aclogger.sdb'
Jan 22 05:59:59 router weewx[1033]: manager: added record 2018-01-22 
05:55:00 PST (1516629300) to daily summary in 'weewx_aclogger.sdb'
Jan 22 05:59:59 router weewx[1033]: cheetahgenerator: Generated 6 files for 
report StandardReport in 0.13 seconds

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