E3: Minimal fix to E3 pruning (#10338)

Co-authored-by: awskii <[email protected]>

eth/stagedsync/exec3.go

@@ -871,6 +871,15 @@ Loop:
 				}
 				t1 = time.Since(tt)
 
+				tt = time.Now()
+
+				if !useExternalTx {
+					if _, err := applyTx.(state2.HasAggTx).AggTx().(*state2.AggregatorRoTx).PruneSmallBatches(ctx, 10*time.Minute, applyTx); err != nil {
+						return err
+					}
+				}
+				t3 = time.Since(tt)
+
 				if err := func() error {
 					doms.Close()
 					if err = execStage.Update(applyTx, outputBlockNum.GetValueUint64()); err != nil {
@@ -890,21 +899,6 @@ Loop:
 							agg.BuildFilesInBackground(outputTxNum.Load())
 						}
 
-						aggCtx := agg.BeginFilesRo()
-						defer aggCtx.Close()
-
-						tt = time.Now()
-						for haveMoreToPrune := true; haveMoreToPrune; {
-							//very aggressive prune, because:
-							// if prune is slow - means DB > RAM and skip pruning will only make things worse
-							// db will grow -> prune will get slower -> db will grow -> ...
-							if haveMoreToPrune, err = aggCtx.PruneSmallBatchesDb(ctx, 10*time.Minute, chainDb); err != nil {
-								return err
-							}
-						}
-
-						t3 = time.Since(tt)
-
 						applyTx, err = cfg.db.BeginRw(context.Background()) //nolint
 						if err != nil {
 							return err