diff --git a/stand/adb.py b/stand/adb.py
index cc1b961..618b855 100644
--- a/stand/adb.py
+++ b/stand/adb.py
@@ -48,6 +48,13 @@ class ArcticLibrary:
         self.lib.update(symbol, df)
 
 
+    def append_data(self, symbol, df):
+        df.index = df.index.view("datetime64[ns]") # adb supports update only for timeseries indexes
+        df.index.name = "run"
+
+        self.lib.append(symbol, df)
+
+
     def has_index(self, symbol, index):
         index = encode_index(index)
 
diff --git a/stand/api.py b/stand/api.py
index ca79486..122765c 100644
--- a/stand/api.py
+++ b/stand/api.py
@@ -30,11 +30,8 @@ def append_run(beamline: Beamline, pgroup: PGroup, run: int, row: dict[str, Any]
     timestamp = datetime.fromisoformat(timestamp) if timestamp else datetime.now()
     row = {"timestamp": timestamp, **row} # setdefault would not force timestamp to be the first column
 
-    index = pd.Timestamp(run) # adb supports update only for timeseries indexes
-    index = pd.Index([index], name="run")
-
-    df = pd.DataFrame(row, index=index)
-    lib.append(pgroup, df)
+    df = pd.DataFrame(row, index=[run])
+    lib.append_data(pgroup, df)
 
     row = {"run": run, **row} # setdefault would not force run to be the first column