I've come across this 
<http://www.web2pyslices.com/slice/show/1634/beauty-graphics-and-charts-with-pygal-updated>
 site 
where one can create charts and graphs.
However I have a challenge of using the database as I don't know how to 
link to it. For example, i want to track a variable like weight. The user 
inputs the values on a regular basis with the trend showing on the graph. 
How do I connect to the database and track it daily?
So far, my code is this:
model
db.define_table('my_tracker',
                Field('weight','double',),
                Field('created_by','reference auth_user',default = auth.
user_id, readable = False, writable = False))

Controller:
    row = db(db.tracker.created_by == auth.user_id).select().first()
    if not row:
        form = SQLFORM(db.my_tracker, submit_button=T('Submit'))
        form.element('input[name=weight]')['_style']=
'width:60px;height:30px;'

-- 
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