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>

internal/eventstore/handler/v2/field_handler.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/jackc/pgx/v5/pgconn"
+	"github.com/shopspring/decimal"
 
 	"github.com/zitadel/zitadel/internal/eventstore"
 )
@@ -126,10 +127,15 @@ func (h *FieldHandler) processEvents(ctx context.Context, config *triggerConfig)
 		return additionalIteration, err
 	}
 	// stop execution if currentState.eventTimestamp >= config.maxCreatedAt
-	if config.maxPosition != 0 && currentState.position >= config.maxPosition {
+	if !config.maxPosition.IsZero() && currentState.position.GreaterThanOrEqual(config.maxPosition) {
 		return false, nil
 	}
 
+	if config.minPosition.GreaterThan(decimal.NewFromInt(0)) {
+		currentState.position = config.minPosition
+		currentState.offset = 0
+	}
+
 	events, additionalIteration, err := h.fetchEvents(ctx, tx, currentState)
 	if err != nil {
 		return additionalIteration, err
@@ -159,7 +165,7 @@ func (h *FieldHandler) fetchEvents(ctx context.Context, tx *sql.Tx, currentState
 
 	idx, offset := skipPreviouslyReducedEvents(events, currentState)
 
-	if currentState.position == events[len(events)-1].Position() {
+	if currentState.position.Equal(events[len(events)-1].Position()) {
 		offset += currentState.offset
 	}
 	currentState.position = events[len(events)-1].Position()
@@ -179,7 +185,7 @@ func (h *FieldHandler) fetchEvents(ctx context.Context, tx *sql.Tx, currentState
 	fillFieldsEvents := make([]eventstore.FillFieldsEvent, len(events))
 	highestPosition := events[len(events)-1].Position()
 	for i, event := range events {
-		if event.Position() == highestPosition {
+		if event.Position().Equal(highestPosition) {
 			offset++
 		}
 		fillFieldsEvents[i] = event.(eventstore.FillFieldsEvent)
@@ -189,14 +195,14 @@ func (h *FieldHandler) fetchEvents(ctx context.Context, tx *sql.Tx, currentState
 }
 
 func skipPreviouslyReducedEvents(events []eventstore.Event, currentState *state) (index int, offset uint32) {
-	var position float64
+	var position decimal.Decimal
 	for i, event := range events {
-		if event.Position() != position {
+		if !event.Position().Equal(position) {
 			offset = 0
 			position = event.Position()
 		}
 		offset++
-		if event.Position() == currentState.position &&
+		if event.Position().Equal(currentState.position) &&
 			event.Aggregate().ID == currentState.aggregateID &&
 			event.Aggregate().Type == currentState.aggregateType &&
 			event.Sequence() == currentState.sequence {