Fix remote.meta.sync TTL issue (#8021) (#8030)

* Fix remote.meta.sync TTL issue (#8021)

Remote entries should not have TTL applied because they represent files
in remote storage, not local SeaweedFS files. When TTL was configured on
a prefix, remote.meta.sync would create entries that immediately expired,
causing them to be deleted and recreated on each sync.

Changes:
- Set TtlSec=0 explicitly when creating remote entries in remote.meta.sync
- Skip TTL application in CreateEntry handler for entries with Remote field set

Fixes #8021

* Add TTL protection for remote entries in update path

- Set TtlSec=0 in doSaveRemoteEntry before calling UpdateEntry
- Add server-side TTL protection in UpdateEntry handler for remote entries
- Ensures remote entries don't inherit or preserve TTL when updated

weed/server/filer_grpc_server.go

@@ -153,7 +153,12 @@ func (fs *FilerServer) CreateEntry(ctx context.Context, req *filer_pb.CreateEntr
 	}
 	newEntry := filer.FromPbEntry(req.Directory, req.Entry)
 	newEntry.Chunks = chunks
+	// Don't apply TTL to remote entries - they're managed by remote storage
+	if newEntry.Remote == nil {
 		newEntry.TtlSec = so.TtlSeconds
+	} else {
+		newEntry.TtlSec = 0
+	}
 
 	createErr := fs.filer.CreateEntry(ctx, newEntry, req.OExcl, req.IsFromOtherCluster, req.Signatures, req.SkipCheckParentDirectory, so.MaxFileNameLength)
 
@@ -185,6 +190,11 @@ func (fs *FilerServer) UpdateEntry(ctx context.Context, req *filer_pb.UpdateEntr
 	newEntry := filer.FromPbEntry(req.Directory, req.Entry)
 	newEntry.Chunks = chunks
 
+	// Don't apply TTL to remote entries - they're managed by remote storage
+	if newEntry.Remote != nil {
+		newEntry.TtlSec = 0
+	}
+
 	if filer.EqualEntry(entry, newEntry) {
 		return &filer_pb.UpdateEntryResponse{}, err
 	}

weed/shell/command_remote_meta_sync.go

@@ -160,6 +160,7 @@ func pullMetadata(commandEnv *CommandEnv, writer io.Writer, localMountedDir util
 							FileSize: uint64(remoteEntry.RemoteSize),
 							Mtime:    remoteEntry.RemoteMtime,
 							FileMode: uint32(0644),
+							TtlSec:   0, // Remote entries should not have TTL
 						},
 						RemoteEntry: remoteEntry,
 					},

weed/shell/command_remote_mount.go

@@ -188,6 +188,7 @@ func doSaveRemoteEntry(client filer_pb.SeaweedFilerClient, localDir string, exis
 	existingEntry.Attributes.FileSize = uint64(remoteEntry.RemoteSize)
 	existingEntry.Attributes.Mtime = remoteEntry.RemoteMtime
 	existingEntry.Attributes.Md5 = nil
+	existingEntry.Attributes.TtlSec = 0 // Remote entries should not have TTL
 	existingEntry.Chunks = nil
 	existingEntry.Content = nil
 	_, updateErr := client.UpdateEntry(context.Background(), &filer_pb.UpdateEntryRequest{