diff --git a/piker/data/marketstore.py b/piker/data/marketstore.py
index 95fd80ee..5d930c3f 100644
--- a/piker/data/marketstore.py
+++ b/piker/data/marketstore.py
@@ -108,6 +108,16 @@ _ohlcv_dt = [
 ]
 
 
+ohlc_key_map = bidict({
+    'Epoch': 'time',
+    'Open': 'open',
+    'High': 'high',
+    'Low': 'low',
+    'Close': 'close',
+    'Volume': 'volume',
+})
+
+
 def mk_tbk(keys: tuple[str, str, str]) -> str:
     '''
     Generate a marketstore table key from a tuple.
@@ -201,6 +211,7 @@ class MarketStoreError(Exception):
 #                 raise MarketStoreError(err)
 
 
+# map of seconds ints to "time frame" accepted keys
 tf_in_1s = bidict({
     1: '1Sec',
     60: '1Min',
@@ -349,6 +360,7 @@ class Storage:
         fqsn: str,
         ohlcv: np.ndarray,
         append_and_duplicate: bool = True,
+        limit: int = int(800e3),
 
     ) -> None:
         # build mkts schema compat array for writing
@@ -368,25 +380,53 @@ class Storage:
             'volume',
         ]]
 
-        # write to db
-        resp = await self.client.write(
-            mkts_array,
-            tbk=f'{fqsn}/1Sec/OHLCV',
+        m, r = divmod(len(mkts_array), limit)
 
-            # NOTE: will will append duplicates
-            # for the same timestamp-index.
-            # TODO: pre deduplicate?
-            isvariablelength=append_and_duplicate,
-        )
+        for i in range(m, 1):
+            to_push = mkts_array[i-1:i*limit]
 
-        log.info(
-            f'Wrote {mkts_array.size} datums to tsdb\n'
-        )
+            # write to db
+            resp = await self.client.write(
+                to_push,
+                tbk=f'{fqsn}/1Sec/OHLCV',
 
-        for resp in resp.responses:
-            err = resp.error
-            if err:
-                raise MarketStoreError(err)
+                # NOTE: will will append duplicates
+                # for the same timestamp-index.
+                # TODO: pre deduplicate?
+                isvariablelength=append_and_duplicate,
+            )
+
+            log.info(
+                f'Wrote {mkts_array.size} datums to tsdb\n'
+            )
+
+            for resp in resp.responses:
+                err = resp.error
+                if err:
+                    raise MarketStoreError(err)
+
+        if r:
+            to_push = mkts_array[m*limit:]
+
+            # write to db
+            resp = await self.client.write(
+                to_push,
+                tbk=f'{fqsn}/1Sec/OHLCV',
+
+                # NOTE: will will append duplicates
+                # for the same timestamp-index.
+                # TODO: pre deduplicate?
+                isvariablelength=append_and_duplicate,
+            )
+
+            log.info(
+                f'Wrote {mkts_array.size} datums to tsdb\n'
+            )
+
+            for resp in resp.responses:
+                err = resp.error
+                if err:
+                    raise MarketStoreError(err)
 
 
 @acm