add TODOs

server/src/scripts/ingest-option-quotes-from-polygon-to-clickhouse.ts

@@ -150,4 +150,12 @@ while((nextUnstartedSymbolAndAsOfDate = await getNextUnstartedSymbolAndAsOfDate(
   // don't loop again until the queue has less than 50 items; we don't want it to grow in memory without bound:
   console.log("Waiting till less than 50 in queue");
   await q.onSizeLessThan(50);
-}
+}
+// wait until pending queue operations are done:
+await q.onSizeLessThan(1);
+
+/*** TODOs ***/
+/*
+ + Gracefully recover from errors in individual operations.
+ + If program stops and is restarted, it should restart anything `pending`: erase existing option contracts for that symbol/asOfDate
+*/