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/repository/sql/query.go

@@ -9,6 +9,7 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/shopspring/decimal"
 	"github.com/zitadel/logging"
 
 	"github.com/zitadel/zitadel/internal/database"
@@ -24,7 +25,7 @@ type querier interface {
 	conditionFormat(repository.Operation) string
 	placeholder(query string) string
 	eventQuery(useV1 bool) string
-	maxSequenceQuery(useV1 bool) string
+	maxPositionQuery(useV1 bool) string
 	instanceIDsQuery(useV1 bool) string
 	Client() *database.DB
 	orderByEventSequence(desc, shouldOrderBySequence, useV1 bool) string
@@ -68,7 +69,7 @@ func query(ctx context.Context, criteria querier, searchQuery *eventstore.Search
 
 	// instead of using the max function of the database (which doesn't work for postgres)
 	// we select the most recent row
-	if q.Columns == eventstore.ColumnsMaxSequence {
+	if q.Columns == eventstore.ColumnsMaxPosition {
 		q.Limit = 1
 		q.Desc = true
 	}
@@ -85,7 +86,7 @@ func query(ctx context.Context, criteria querier, searchQuery *eventstore.Search
 
 	switch q.Columns {
 	case eventstore.ColumnsEvent,
-		eventstore.ColumnsMaxSequence:
+		eventstore.ColumnsMaxPosition:
 		query += criteria.orderByEventSequence(q.Desc, shouldOrderBySequence, useV1)
 	}
 
@@ -141,8 +142,8 @@ func query(ctx context.Context, criteria querier, searchQuery *eventstore.Search
 
 func prepareColumns(criteria querier, columns eventstore.Columns, useV1 bool) (string, func(s scan, dest interface{}) error) {
 	switch columns {
-	case eventstore.ColumnsMaxSequence:
-		return criteria.maxSequenceQuery(useV1), maxSequenceScanner
+	case eventstore.ColumnsMaxPosition:
+		return criteria.maxPositionQuery(useV1), maxPositionScanner
 	case eventstore.ColumnsInstanceIDs:
 		return criteria.instanceIDsQuery(useV1), instanceIDsScanner
 	case eventstore.ColumnsEvent:
@@ -152,13 +153,15 @@ func prepareColumns(criteria querier, columns eventstore.Columns, useV1 bool) (s
 	}
 }
 
-func maxSequenceScanner(row scan, dest any) (err error) {
-	position, ok := dest.(*sql.NullFloat64)
+func maxPositionScanner(row scan, dest interface{}) (err error) {
+	position, ok := dest.(*decimal.Decimal)
 	if !ok {
-		return zerrors.ThrowInvalidArgumentf(nil, "SQL-NBjA9", "type must be sql.NullInt64 got: %T", dest)
+		return zerrors.ThrowInvalidArgumentf(nil, "SQL-NBjA9", "type must be pointer to decimal.Decimal got: %T", dest)
 	}
-	err = row(position)
+	var res decimal.NullDecimal
+	err = row(&res)
 	if err == nil || errors.Is(err, sql.ErrNoRows) {
+		*position = res.Decimal
 		return nil
 	}
 	return zerrors.ThrowInternal(err, "SQL-bN5xg", "something went wrong")
@@ -187,7 +190,7 @@ func eventsScanner(useV1 bool) func(scanner scan, dest interface{}) (err error)
 			return zerrors.ThrowInvalidArgumentf(nil, "SQL-4GP6F", "events scanner: invalid type %T", dest)
 		}
 		event := new(repository.Event)
-		position := new(sql.NullFloat64)
+		position := new(decimal.NullDecimal)
 
 		if useV1 {
 			err = scanner(
@@ -224,7 +227,7 @@ func eventsScanner(useV1 bool) func(scanner scan, dest interface{}) (err error)
 			logging.New().WithError(err).Warn("unable to scan row")
 			return zerrors.ThrowInternal(err, "SQL-M0dsf", "unable to scan row")
 		}
-		event.Pos = position.Float64
+		event.Pos = position.Decimal
 		return reduce(event)
 	}
 }