Port `storesh` cli-cmd machinery to `Flume` apis

piker/data/marketstore.py

@@ -661,7 +661,7 @@ async def tsdb_history_update(
             [fqsn],
             start_stream=False,
 
-        ) as (feed, stream),
+        ) as feed,
     ):
         profiler(f'opened feed for {fqsn}')
 
@@ -669,12 +669,13 @@ async def tsdb_history_update(
         # to_prepend = None
 
         if fqsn:
-            symbol = feed.symbols.get(fqsn)
+            flume = feed.flumes[fqsn]
+            symbol = flume.symbol
             if symbol:
-                fqsn = symbol.front_fqsn()
+                fqsn = symbol.fqsn
 
             # diff db history with shm and only write the missing portions
-            # ohlcv = feed.hist_shm.array
+            # ohlcv = flume.hist_shm.array
 
             # TODO: use pg profiler
             # for secs in (1, 60):