JSON Object Goal - describe recentdata datapoint and some goal attributes

[krugerk]

Listing seen but not yet documented attributes for a beeminder goal.

Open for tips on clarifying the following goal attributes:

• lasttouch
• recent_data (for example, is the the case this is at most 5)

Also describes the 'recent data datapoint', which differs from datapoint.

The difference between created_at and measured_at was not clear to me.
Furthermore, what can be said of urtext, of the dictionary in id, and of canonical?

• urtext
• id
• canonical