feat: updated telegram summary to use timestamp for date!

dags/hivemind_etl_helpers/src/db/telegram/transform/summary.py

@@ -34,7 +34,7 @@ def transform(self, summaries: dict[date, str]) -> list[Document]:
                 metadata={
                     "date": datetime.combine(
                         day, datetime.min.time(), tzinfo=timezone.utc
-                    ),
+                    ).timestamp(),
                 },
             )
             summary_docs.append(document)