diff --git a/bincio/serve/server.py b/bincio/serve/server.py
index e0887e5..6518728 100644
--- a/bincio/serve/server.py
+++ b/bincio/serve/server.py
@@ -455,14 +455,15 @@ async def admin_delete_activities(
             f.unlink()
             deleted += 1
 
-    # Wipe merged cache and top-level index so they don't show stale data
+    # Wipe merged cache, top-level index, and dedup cache so re-uploads aren't blocked
     import shutil
     merged_dir = user_dir / "_merged"
     if merged_dir.exists():
         shutil.rmtree(merged_dir)
-    index_file = user_dir / "index.json"
-    if index_file.exists():
-        index_file.unlink()
+    for name in ("index.json", ".bincio_cache.json"):
+        f = user_dir / name
+        if f.exists():
+            f.unlink()
 
     _trigger_rebuild(handle)
     return JSONResponse({"ok": True, "deleted": deleted})