#Postgres backend for state store.
Simple key-value store with last update timestamp.
ToDo
$3
Might want to add a history table to keep track of when things were deployed.
Would complement version control, since it could tell when things are deployed
due to configuration changes or version change.
$3
Database is not maintained yet using migrations. If more changes are required,
consider moving to a separate user/schema and use migration tool to maintain
database.