fix(eventstore): use decimal, correct mirror (#9916)

# 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

internal/eventstore/handler/v2/statement.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/shopspring/decimal"
 	"github.com/zitadel/logging"
 	"golang.org/x/exp/constraints"
 
@@ -52,7 +53,7 @@ func (h *Handler) eventsToStatements(tx *sql.Tx, events []eventstore.Event, curr
 			return statements, err
 		}
 		offset++
-		if previousPosition != event.Position() {
+		if !previousPosition.Equal(event.Position()) {
 			// offset is 1 because we want to skip this event
 			offset = 1
 		}
@@ -82,7 +83,7 @@ func (h *Handler) reduce(event eventstore.Event) (*Statement, error) {
 type Statement struct {
 	Aggregate    *eventstore.Aggregate
 	Sequence     uint64
-	Position     float64
+	Position     decimal.Decimal
 	CreationDate time.Time
 
 	offset uint32