Pivot return object on time

[peterdudfield]

Detailed Description

We should try pivoting the return object, to return by time

Context

• good to speed up things

Possible Implementation

• Change tree from site_id --> time to time --> site_uuid
• Something like

[ {time: 'xxxx',
locations: [ 
                  {'forecast_mw:1.2, 
                   'forecast_per', 
                    'site_uuid':1, 
                   { 'forecast_mw:1.2, 
                     'forecast_per', gsp_id:2}
},
{}.]

[peterdudfield]

Changes from

to

For 26 sites

Time goes from ~6s to 6s Size goes from 5.3MB to 437KB

Note 4 seconds is dont by searching through sites, and seeing if the user has access to them #116