Coordinating provider datasets from SAMHSA (x2+) to NPI/NPPES and PALS

Documenting Jan/Feb 2021 decisions and problems to solve for provider datasets.

For **data recency & updates/archives**:
-- Include two DATE fields per table: date_firstfind and date_lastfind
-- Our oldest date_firstfind is 2019-12-24, when @mariekers downloaded the 420 records initially provided by Code for Philly et al. in Feb/Mar 2020 data hackathon

For **data privacy**:
-- DB will upload only rows where archival_only = FALSE

No files, tests, or entry points are named. Start by locating the provider-dataset and database documentation, then review the stated date fields and archival_only privacy rule; done means the Jan/Feb 2021 decisions and unresolved problems are clearly captured.

Written by the indexing model from the issue text.