Migrate staging database to Crunchydata basic db

[wgwz]

The indexer has a staging database that's on the basic plan in heroku-postgres.
It may be cheaper to host this in crunchydata alongside the production database.
that said, the staging database is on a $9/month plan with heroku.
so this may be considered a low-priority task.
furthermore, the staging database for the indexer does not hold very much data.
we periodically prune the database, and we don't expect all historical data present in it at this time.
if we do want a more historical indexing of redwood, then maybe this task becomes higher priority.
because at that point, it would be cheaper to use crunchy to host a larger database.