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/event_store.go

@@ -8,7 +8,9 @@ import (
 	"io"
 	"time"
 
+	"github.com/jackc/pgx/v5/pgconn"
 	"github.com/jackc/pgx/v5/stdlib"
+	"github.com/shopspring/decimal"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 	"github.com/zitadel/logging"
@@ -89,7 +91,7 @@ func copyEvents(ctx context.Context, source, dest *db.DB, bulkSize uint32) {
 	previousMigration, err := queryLastSuccessfulMigration(ctx, destinationES, source.DatabaseName())
 	logging.OnError(err).Fatal("unable to query latest successful migration")
 
-	var maxPosition float64
+	var maxPosition decimal.Decimal
 	err = source.QueryRowContext(ctx,
 		func(row *sql.Row) error {
 			return row.Scan(&maxPosition)
@@ -101,7 +103,7 @@ func copyEvents(ctx context.Context, source, dest *db.DB, bulkSize uint32) {
 	logging.WithFields("from", previousMigration.Position, "to", maxPosition).Info("start event migration")
 
 	nextPos := make(chan bool, 1)
-	pos := make(chan float64, 1)
+	pos := make(chan decimal.Decimal, 1)
 	errs := make(chan error, 3)
 
 	go func() {
@@ -152,7 +154,7 @@ func copyEvents(ctx context.Context, source, dest *db.DB, bulkSize uint32) {
 	go func() {
 		defer close(pos)
 		for range nextPos {
-			var position float64
+			var position decimal.Decimal
 			err := dest.QueryRowContext(
 				ctx,
 				func(row *sql.Row) error {
@@ -175,6 +177,10 @@ func copyEvents(ctx context.Context, source, dest *db.DB, bulkSize uint32) {
 		tag, err := conn.PgConn().CopyFrom(ctx, reader, "COPY eventstore.events2 FROM STDIN")
 		eventCount = tag.RowsAffected()
 		if err != nil {
+			pgErr := new(pgconn.PgError)
+			errors.As(err, &pgErr)
+
+			logging.WithError(err).WithField("pg_err_details", pgErr.Detail).Error("unable to copy events into destination")
 			return zerrors.ThrowUnknown(err, "MIGRA-DTHi7", "unable to copy events into destination")
 		}
 
@@ -187,7 +193,7 @@ func copyEvents(ctx context.Context, source, dest *db.DB, bulkSize uint32) {
 	logging.WithFields("took", time.Since(start), "count", eventCount).Info("events migrated")
 }
 
-func writeCopyEventsDone(ctx context.Context, es *eventstore.EventStore, id, source string, position float64, errs <-chan error) {
+func writeCopyEventsDone(ctx context.Context, es *eventstore.EventStore, id, source string, position decimal.Decimal, errs <-chan error) {
 	joinedErrs := make([]error, 0, len(errs))
 	for err := range errs {
 		joinedErrs = append(joinedErrs, err)