fix(eventstore): use decimal, correct mirror (#9914)

# Eventstore fixes

- `event.Position` used float64 before which can lead to [precision
loss](https://github.com/golang/go/issues/47300). The type got replaced
by [a type without precision
loss](https://github.com/jackc/pgx-shopspring-decimal)
- the handler reported the wrong error if the current state was updated
and therefore took longer to retry failed events.

# Mirror fixes

- max age of auth requests can be configured to speed up copying data
from `auth.auth_requests` table. Auth requests last updated before the
set age will be ignored. Default is 1 month
- notification projections are skipped because notifications should be
sent by the source system. The projections are set to the latest
position
- ensure that mirror can be executed multiple times

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

cmd/mirror/projections.go

@@ -296,6 +296,13 @@ func execProjections(ctx context.Context, instances <-chan string, failedInstanc
 			continue
 		}
 
+		err = projection.ProjectInstanceFields(ctx)
+		if err != nil {
+			logging.WithFields("instance", instance).WithError(err).Info("trigger fields failed")
+			failedInstances <- instance
+			continue
+		}
+
 		err = auth_handler.ProjectInstance(ctx)
 		if err != nil {
 			logging.WithFields("instance", instance).WithError(err).Info("trigger auth handler failed")