diff --git a/nextcloud_mcp_server/app.py b/nextcloud_mcp_server/app.py
index 2a92cafe..9c99b2aa 100644
--- a/nextcloud_mcp_server/app.py
+++ b/nextcloud_mcp_server/app.py
@@ -1452,15 +1452,14 @@ def get_app(transport: str = "streamable-http", enabled_apps: list[str] | None =
             return
         try:
             qdrant_client = await get_qdrant_client()
-            swept, kept = await sweep_orphan_placeholders(
-                qdrant_client, settings.qdrant_collection
-            )
+            collection = settings.get_collection_name()
+            swept, kept = await sweep_orphan_placeholders(qdrant_client, collection)
             logger.info(
                 "vector_sync.orphan_sweep",
                 extra={
                     "swept": swept,
                     "kept": kept,
-                    "collection": settings.qdrant_collection,
+                    "collection": collection,
                 },
             )
         except Exception:
diff --git a/nextcloud_mcp_server/vector/placeholder.py b/nextcloud_mcp_server/vector/placeholder.py
index e31ae871..af569ae6 100644
--- a/nextcloud_mcp_server/vector/placeholder.py
+++ b/nextcloud_mcp_server/vector/placeholder.py
@@ -21,7 +21,7 @@ import logging
 import time
 import uuid
 
-from qdrant_client import models
+from qdrant_client import AsyncQdrantClient, models
 from qdrant_client.models import FieldCondition, Filter, MatchValue, PointStruct
 
 from nextcloud_mcp_server.config import get_settings
@@ -340,8 +340,8 @@ _ORPHAN_SWEEP_BATCH_SIZE = 100
 
 
 async def sweep_orphan_placeholders(
-    qdrant_client,
-    collection_name: str,
+    qdrant_client: AsyncQdrantClient,
+    collection: str,
     *,
     batch_size: int = _ORPHAN_SWEEP_BATCH_SIZE,
 ) -> tuple[int, int]:
@@ -362,7 +362,8 @@ async def sweep_orphan_placeholders(
 
     Args:
         qdrant_client: Async Qdrant client.
-        collection_name: Target collection.
+        collection: Target collection (resolved name from
+            ``settings.get_collection_name()``, not the raw config key).
         batch_size: Scroll page size. Default 100 — small enough that
             a single delete payload is reasonable, large enough that
             round-trip count stays bounded for typical placeholder
@@ -383,7 +384,7 @@ async def sweep_orphan_placeholders(
 
     while True:
         points, offset = await qdrant_client.scroll(
-            collection_name=collection_name,
+            collection_name=collection,
             scroll_filter=placeholder_filter,
             limit=batch_size,
             offset=offset,
@@ -404,7 +405,7 @@ async def sweep_orphan_placeholders(
 
         if orphan_ids:
             await qdrant_client.delete(
-                collection_name=collection_name,
+                collection_name=collection,
                 points_selector=orphan_ids,
             )
             swept += len(orphan_ids)