diff --git a/patching/210-bgs-since-empty-fix.patch b/patching/210-bgs-since-empty-fix.patch
new file mode 100644
index 0000000..763005d
--- /dev/null
+++ b/patching/210-bgs-since-empty-fix.patch
@@ -0,0 +1,26 @@
+diff --git a/indexer/indexer.go b/indexer/indexer.go
+index abc1234..def5678 100644
+--- a/indexer/indexer.go
++++ b/indexer/indexer.go
+@@ -104,13 +104,19 @@ func (ix *Indexer) HandleRepoEvent(ctx context.Context, evt *repomgr.RepoEvent)
+ 		toobig = true
+ 	}
+
++	// Normalize empty string to nil for since field
++	// Empty string fails TID validation on consumers
++	var since *string
++	if evt.Since != nil && *evt.Since != "" {
++		since = evt.Since
++	}
++
+ 	ix.log.Debug("Sending event", "did", did)
+ 	if err := ix.events.AddEvent(ctx, &events.XRPCStreamEvent{
+ 		RepoCommit: &comatproto.SyncSubscribeRepos_Commit{
+ 			Repo:   did,
+ 			Blocks: slice,
+ 			Rev:    evt.Rev,
+-			Since:  evt.Since,
++			Since:  since,
+ 			Commit: lexutil.LexLink(evt.NewRoot),
+ 			Time:   time.Now().Format(util.ISO8601),
+ 			Ops:    outops,