Implement operational database purging #489
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Introduce the concepts of "operational database" and "archive database". The "operational database" is the one where most operations are done, and which has recent data only, as opposed to "archive database", which keeps all the data, but is either slow or expensive to query. In our case the former is PostgreSQL and the latter is BigQuery. Export the operational database specification to Cloud Functions as "KCIDB_OPERATIONAL_DATABASE", and the archive database as "KCIDB_ARCHIVE_DATABASE".
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Add a cloud function and a cloud scheduler job for purging the operational database of data that is older than six months, rounded down to month boundary.
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Add a cloud function and a cloud scheduler job for purging the operational database of data that is older than six months, rounded down to month boundary.