.ib.feed: trim bars frame to `start_dt`

piker/brokers/ib/feed.py

@@ -269,17 +269,26 @@ async def open_history_client(
                 and
                 first_dt < start_dt
             ):
-                bars_array = bars_array[
+                trimmed_bars = bars_array[
                     bars_array['time'] >= start_dt.timestamp()
                 ]
+                if (
+                    trimmed_first_dt := from_timestamp(trimmed_bars['time'][0])
+                    !=
+                    start_dt
+                ):
                     # TODO! rm this once we're more confident it never hits!
                     breakpoint()
                     raise RuntimeError(
                         f'OHLC-bars array start is gt `start_dt` limit !!\n'
                         f'start_dt: {start_dt}\n'
-                    f'last_dt: {last_dt}\n'
+                        f'first_dt: {first_dt}\n'
+                        f'trimmed_first_dt: {trimmed_first_dt}\n'
                     )
 
+                # XXX, overwrite with start_dt-limited frame
+                bars_array = trimmed_bars
+
             return (
                 bars_array,
                 first_dt,