Unite measurement into observation (or observation into measurement) #750
Description
Assignment of concept to a table requires maintenance. (domain of a concept). It is a burden that can be avoided and has no major value.
Most ETLs start with a unified table anyway and split based on athena concept domain.
Unifying those 2 tables would make the model better.
It would also harmonize better with other standards (e.g., FHIR that relies on Observation resource).
It would allow simpler thinking for Oncology extension and image extension.
It is hard to explain to folks where the boundary of measurement and observation exactly is.
Implementation can be gradual where a view is created of a unified table such that existing data pipelines can be somewhat re-used.