Backend: Mechanism for tracking which components were created within a unit?

[bradenmacdonald]

Do we want a metadata field on Component objects to track whether or not they were originally created within a unit or independently?

See extensive discussion on Slack: https://openedx.slack.com/archives/C06JG6RFE4V/p1740064898270759

Note: this could be done in a hacky way by using a different usage ID format (e.g. suffix the usage key with in-unit) or applying a tag ("Created in Unit"), but it's likely better to make it a proper metadata field.

Do we also want this to apply to containers, e.g. mark a Unit as "Created in a Subsection" vs. created independently?

[ormsbee]

My thought was to add a can_stand_alone field to PublishableEntity. We default it to True for all existing entities, and when things are created as part of containers, we set it to False. That would make it straightforward to apply to any layer of the hierarchy.

[bradenmacdonald]

@ormsbee That makes sense to me.

[ChrisChV]

Implemented in #289