Add database architecture

2020-03-21 22:54:05 +00:00 · 2020-03-21 22:54:05 +00:00 · 149c28e82b
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 ## Proposed Tech stack
 - NodeJS
 - Express
 - Postgresql
 - Luxon

+## Database architecture
+See: https://dbdiagram.io/d/5e769ab14495b02c3b88936f
+
 ## How to deal with date and time in PostgreSQL?
 - use `datetime` datatype without timezone (datetime with timezone is using offset, which doesn't work well with DST)
 - store datetime in UTC