fix(eventstore): fill new column with data (#2288)

* fix: smaller outage on events migration first part

* fix: fill old events with sequence

* fix: migration add transactions

* fix: mig

* rename mig

* replace migration with setup step

* regenerate mock

* add step 20 to config

* log

* simplify step

* limit 1000

* limit 500

internal/eventstore/repository/sql/setup.go

@@ -0,0 +1,58 @@
+package sql
+
+import (
+	"context"
+
+	"github.com/caos/logging"
+	repo "github.com/caos/zitadel/internal/eventstore/repository"
+)
+
+func (db *CRDB) Step20(ctx context.Context, latestSequence uint64) error {
+	currentSequence := uint64(0)
+	limit := uint64(500)
+	previousSequences := make(map[repo.AggregateType]Sequence)
+	for currentSequence < latestSequence {
+		events, err := db.Filter(ctx, &repo.SearchQuery{
+			Columns: repo.ColumnsEvent,
+			Limit:   limit,
+			Filters: [][]*repo.Filter{
+				{
+					&repo.Filter{
+						Field:     repo.FieldSequence,
+						Operation: repo.OperationGreater,
+						Value:     currentSequence,
+					},
+				},
+			},
+		})
+		if err != nil {
+			return err
+		}
+
+		tx, err := db.client.Begin()
+		if err != nil {
+			return err
+		}
+
+		for _, event := range events {
+			if _, err := tx.Exec("SAVEPOINT event_update"); err != nil {
+				return err
+			}
+			seq := Sequence(previousSequences[event.AggregateType])
+			if _, err = tx.Exec("UPDATE eventstore.events SET previous_aggregate_type_sequence = $1 WHERE event_sequence = $2", &seq, event.Sequence); err != nil {
+				return err
+			}
+			if _, err = tx.Exec("RELEASE SAVEPOINT event_update"); err != nil {
+				return err
+			}
+			previousSequences[event.AggregateType] = Sequence(event.Sequence)
+			currentSequence = event.Sequence
+		}
+
+		if err = tx.Commit(); err != nil {
+			return err
+		}
+		logging.LogWithFields("SQL-bXVwS", "currentSeq", currentSequence, "events", len(events)).Info("events updated")
+	}
+	return nil
+}