fix: Fixed transaction rollback in validate command

internal/db/postgres/cmd/dump.go

@@ -608,6 +608,9 @@ func (d *Dump) validateDumpWorker(
 			Msgf("dumping started")
 
 		entry, err := func() (entries.Entry, error) {
+			// We do not need to manage transaction in case of validation - we just close the connection. According to the
+			// documentation, the COPY stream can be interrupted by the client via connection close.
+			// If you try to roll back the transaction we will face the deadlock.
 			conn, tx, err := d.getWorkerTransaction(ctx)
 
 			if err != nil {
@@ -620,12 +623,6 @@ func (d *Dump) validateDumpWorker(
 				}
 			}()
 
-			defer func() {
-				if err := tx.Rollback(ctx); err != nil {
-					log.Debug().Err(err).Int("WorkerId", id).Msg("unable to rollback transaction")
-				}
-			}()
-
 			entry, err := task.Execute(ctx, tx, d.st)
 			if err != nil {
 				return nil, err