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Chad Whitacre 5e69c4542a Reimplement #141 using a Postgres rule
Postgres has a feature called "rules," where we can rewrite queries
based on certain conditions. I've decided to implement #141 using a
rule. Starting with the example here:

  http://www.postgresql.org/docs/9.1/static/rules-update.html

this commit adds a rule to log changes to the participant.goal column to
a separate `goals` table. This means that we can keep the simplicity of
reading and writing that value as we've always done, *and* we can have a
detailed log of changes to drive more advanced visualizations.

Huzzah! :D
2013-04-03 11:02:49 -04:00
..
2013-04-01 17:39:41 -04:00
2013-02-22 07:12:51 -05:00