Currently, in enterprise we're struggling with setting service and
transactionality; all our verfications says that the setting key is not
present, so setting-store happily tries to insert a new row with a new
PK. However, somehow at the same time, the key already exists. This
commit adds conflict handling to the insertNewRow.
Adds a postgres_version gauge to allow us to see postgres_version in
prometheus and to post it upstream when version checking. Depends on
https://github.com/bricks-software/version-function/pull/20 to be merged
first to ensure our version-function doesn't crash when given the
postgres-version data.
