diff --git a/modules/story-summary/story-summary.js b/modules/story-summary/story-summary.js
index cc257dc..eca1617 100644
--- a/modules/story-summary/story-summary.js
+++ b/modules/story-summary/story-summary.js
@@ -573,6 +573,9 @@ async function handleGenerateVectors(vectorCfg) {
             }
         }
 
+        // Full rebuild completed: vector boundary should match latest floor.
+        await updateMeta(chatId, { lastChunkFloor: chat.length - 1 });
+
         postToFrame({ type: "VECTOR_GEN_PROGRESS", phase: "ALL", current: -1, total: 0 });
         await sendVectorStatsToFrame();