Syntax highlighting of a26cb65 ~( ArchivedProducts)

Discussion and ideas to archive products done with a previous version of a pipeline and allow to create new versions.

== Objective, definitions ==

Until now, most of our pipelines changes could be labeled as "revisions" : scripts were improved but results were expected to remain the same.

We aim now to deal with "versions" changes where a script modifications can include complete workflow overload and different (hopefully better) results.

In the event of a version change, it is expected that pre-existing products could be re-created using the newer pipelines, while keeping the previous result as an "archived" state.

== Design ==

=== Archived products accessibility ===

Archived products are to be explicitly accessed (productid+prodtype). 

There is no need to modify/have a map interface dedicated to them (which works with observations anyway, not products), and probably no need in the workspace too?

=== Dependencies ===

MarsSI products have a dependency fields since the major DB rewrite.

What about an archived products dependencies? We cannot archive deps at the same time, they might be still up-to-date. Forget deps as they are used foremost for procesing logic?

What about an archived product that is a dependancy? It should trigger a archival of the other products too. But their own pipeline version do not change... Use mctime?

== Implementation ==

=== Data ===

Files are to be moved to /data/archive/$TARGET/$INSTHOSTID/$INSTID/$VERSION (ex /data/archive/MARS/MRO/CTX/CTX_008716_1998_008782_1999/V1)

Create an archive job and trigger it from the database? Less efficient but cleaner and safer than managing DB on one hand, CPs on the other.

=== Database ===

Rework a bit the Product model:
 * Create a BaseProduct abstract model: hold common fields
 * Product keep the name, inherit BaseProduct and status/depends fields, most methods
 * Create an ArchivedProduct modeI, BaseProduct + version fields

=== Web ===

Provide a set of search/display interface that allow for copy operations.