Permit advanced covidcast metadata to specify when some signals of an otherwise-active source are no longer being updated.

[krivard]

We currently track "active" status as a characteristic of the source. However, when sources have some signals that are still active, but others which have been discontinued, the metadata cannot help a downstream agent determine whether an individual signal is still being updated or not. For example, the hospital-admissions source is still updating smoothed_covid19_from_claims and smoothed_adj_covid19_from_claims, but not smoothed_covid19 or smoothed_adj_covid19. A query for meta data about the smoothed_covid19 signal claims it is active, but that is in reference to the overall source, not the signal requested.

Not sure how we want to resolve this -- we could:

• Split these sources into subdivisions, and throw all the inactive signals into a subdivision with active=False. Do something clever so that queries using the db source name get routed to the correct subdivision.
• Move active status from per-source to per-signal. Do something clever so that someone iterating over sources trying to only display the active ones doesn't have to iterate through all the child signals just in case.
• Keep active status per-source, but permit signals to override. Use the following rule: the first active=False wins.
• Something else

[sgratzl]

* Move active status from per-source to per-signal. Do something clever so that someone iterating over sources trying to only display the active ones doesn't have to iterate through all the child signals just in case.

I would go for this one. The /meta endpoint allows to filter for active sources/signals and it already skips empty sources when returning the data.

[krivard]

Sounds good, make it so

[sgratzl]

@krivard it seems like I not longer have write access to the signal sheet, since everything is protected

[krivard]

Fixed