fix: Fill deltalog entry num & time range in L0 compactions (#33004)

Resolves #33003

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>

internal/datanode/l0_compactor.go

@@ -19,6 +19,7 @@ package datanode
 import (
 	"context"
 	"fmt"
+	"math"
 	"time"
 
 	"github.com/samber/lo"
@@ -330,11 +331,24 @@ func (t *levelZeroCompactionTask) composeDeltalog(segmentID int64, dData *storag
 
 	uploadKv[blobPath] = blob.GetValue()
 
-	// TODO Timestamp?
+	minTs := uint64(math.MaxUint64)
+	maxTs := uint64(0)
+	for _, ts := range dData.Tss {
+		if ts > maxTs {
+			maxTs = ts
+		}
+		if ts < minTs {
+			minTs = ts
+		}
+	}
+
 	deltalog := &datapb.Binlog{
+		EntriesNum:    dData.RowCount,
 		LogSize:       int64(len(blob.GetValue())),
 		LogPath:       blobPath,
 		LogID:         logID,
+		TimestampFrom: minTs,
+		TimestampTo:   maxTs,
 	}
 
 	return uploadKv, deltalog, nil