chore: wait for known missing changes during the initial cluster store sync

internal/machine/store/store.go

@@ -3,6 +3,7 @@ package store
 import (
 	"context"
 	_ "embed"
+	"encoding/hex"
 	"errors"
 	"fmt"
 	"log/slog"
@@ -75,6 +76,35 @@ func (s *Store) DBVersion(ctx context.Context) (int64, error) {
 	return version, nil
 }
 
+type MissingChange struct {
+	ActorID      string
+	StartVersion int64
+	EndVersion   int64
+}
+
+// KnownMissingChanges returns a list of currently known missing changes in the Corrosion database.
+func (s *Store) KnownMissingChanges(ctx context.Context) ([]MissingChange, error) {
+	rows, err := s.corro.QueryContext(ctx, "SELECT actor_id, start, end FROM __corro_bookkeeping_gaps")
+	if err != nil {
+		return nil, fmt.Errorf("query missing changes: %w", err)
+	}
+	defer rows.Close()
+
+	var changes []MissingChange
+	for rows.Next() {
+		var c MissingChange
+		var actorBytes []byte
+		if err = rows.Scan(&actorBytes, &c.StartVersion, &c.EndVersion); err != nil {
+			return nil, fmt.Errorf("scan missing change: %w", err)
+		}
+
+		c.ActorID = hex.EncodeToString(actorBytes)
+		changes = append(changes, c)
+	}
+
+	return changes, nil
+}
+
 func (s *Store) CreateMachine(ctx context.Context, m *pb.MachineInfo) error {
 	mJSON, err := protojson.Marshal(m)
 	if err != nil {