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/query/current_state_test.go

@@ -7,6 +7,8 @@ import (
 	"fmt"
 	"regexp"
 	"testing"
+
+	"github.com/shopspring/decimal"
 )
 
 var (
@@ -86,7 +88,7 @@ func Test_CurrentSequencesPrepares(t *testing.T) {
 						State: State{
 							EventCreatedAt: testNow,
 							LastRun:        testNow,
-							Position:       20211108,
+							Position:       decimal.NewFromInt(20211108),
 							AggregateID:    "agg-id",
 							AggregateType:  "agg-type",
 							Sequence:       20211108,
@@ -133,7 +135,7 @@ func Test_CurrentSequencesPrepares(t *testing.T) {
 						ProjectionName: "projection-name",
 						State: State{
 							EventCreatedAt: testNow,
-							Position:       20211108,
+							Position:       decimal.NewFromInt(20211108),
 							LastRun:        testNow,
 							AggregateID:    "agg-id",
 							AggregateType:  "agg-type",
@@ -144,7 +146,7 @@ func Test_CurrentSequencesPrepares(t *testing.T) {
 						ProjectionName: "projection-name2",
 						State: State{
 							EventCreatedAt: testNow,
-							Position:       20211108,
+							Position:       decimal.NewFromInt(20211108),
 							LastRun:        testNow,
 							AggregateID:    "agg-id",
 							AggregateType:  "agg-type",