diff --git a/piker/data/marketstore.py b/piker/data/marketstore.py
index 50804031..ef4a9657 100644
--- a/piker/data/marketstore.py
+++ b/piker/data/marketstore.py
@@ -405,7 +405,7 @@ async def open_storage_client(
 
 
 async def tsdb_history_update(
-    fqsn: str,
+    fqsn: Optional[str] = None,
 
 ) -> list[str]:
 
@@ -443,50 +443,52 @@ async def tsdb_history_update(
     async with (
         open_storage_client(fqsn) as storage,
 
-        maybe_open_feed(
-            [fqsn],
-            start_stream=False,
+        # maybe_open_feed(
+        #     [fqsn],
+        #     start_stream=False,
 
-        ) as (feed, stream),
+        # ) as (feed, stream),
     ):
         profiler(f'opened feed for {fqsn}')
 
-        symbol = feed.symbols.get(fqsn)
-        if symbol:
-            fqsn = symbol.front_fqsn()
+
+        # to_append = feed.shm.array
+        # to_prepend = None
+
+        if fqsn:
+            symbol = feed.symbols.get(fqsn)
+            if symbol:
+                fqsn = symbol.front_fqsn()
+
+            # diff db history with shm and only write the missing portions
+            ohlcv = feed.shm.array
+
+            # TODO: use pg profiler
+            tsdb_arrays = await storage.read_ohlcv(fqsn)
+            # hist diffing
+            if tsdb_arrays:
+                onesec = tsdb_arrays[1]
+                to_append = ohlcv[ohlcv['time'] > onesec['Epoch'][-1]]
+                to_prepend = ohlcv[ohlcv['time'] < onesec['Epoch'][0]]
+
+            profiler('Finished db arrays diffs')
 
         syms = await storage.client.list_symbols()
         log.info(f'Existing tsdb symbol set:\n{pformat(syms)}')
         profiler(f'listed symbols {syms}')
 
-        # diff db history with shm and only write the missing portions
-        ohlcv = feed.shm.array
-
-        # TODO: use pg profiler
-        tsdb_arrays = await storage.read_ohlcv(fqsn)
-
-        to_append = feed.shm.array
-        to_prepend = None
-
         from tractor.trionics import ipython_embed
         await ipython_embed()
 
-        # hist diffing
-        if tsdb_arrays:
-            onesec = tsdb_arrays[1]
-            to_append = ohlcv[ohlcv['time'] > onesec['Epoch'][-1]]
-            to_prepend = ohlcv[ohlcv['time'] < onesec['Epoch'][0]]
 
-        profiler('Finished db arrays diffs')
+        # for array in [to_append, to_prepend]:
+        #     if array is None:
+        #         continue
 
-        for array in [to_append, to_prepend]:
-            if array is None:
-                continue
-
-            log.info(
-                f'Writing datums {array.size} -> to tsdb from shm\n'
-            )
-            await storage.write_ohlcv(fqsn, array)
+        #     log.info(
+        #         f'Writing datums {array.size} -> to tsdb from shm\n'
+        #     )
+        #     await storage.write_ohlcv(fqsn, array)
 
         profiler('Finished db writes')