explicitly rename index in .var

app.py

@@ -48,7 +48,7 @@ PARQUET_EMB_COL = "tx1-70m"
 # helper to read AnnData header
 def read_anndata_header(fileobj):
     adata = sc.read_h5ad(fileobj.name, backed="r")
-    adata.var = adata.var.reset_index(drop=False)
+    adata.var = adata.var.reset_index(drop=False, names="index")
     layers = list(adata.layers.keys())
     var_cols = list(adata.var.columns)
     obs_cols = list(adata.obs.columns)
@@ -155,7 +155,7 @@ def _embed(adata_bytes, layer_name, feature_col, use_symbols, progress):
 
         # load into memory, subsetting if needed
         adata = adata_backed[:limit, :].to_memory()
-        adata.var = adata.var.reset_index(drop=False)
+        adata.var = adata.var.reset_index(drop=False, names="index")
         try:
             adata_backed.file.close()
         except Exception: