In this changeset, I added ORM relationships to the DB models
concerning the already-declared foreign keys.
I also modified the DB query building to now handle a new 'eager'
parameter that, if True, is responsible to also fetch the data
relative to these 'parent' DB entities (no cascading).
Change-Id: Ieea181af9a4b173c54621dcc6c549161f5a35aeb
Partially-Implements: blueprint watcher-versioned-objects
In this changeset, I created a new model named EfficacyIndicator
which is responsible for storing information regarding the efficacy
indicators that were computed by the strategy in its solution. Every
efficacy indicator should relate to a single Action Plan.
Partially Implements: blueprint efficacy-indicator
Change-Id: Ifc14ea5e16e92f032d7912c9b3fdc270af79cab6
