feat: change the summary date format to be string!

while filtering on qdrant data, it was only supporting integer, string, and boolean.

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

@@ -32,9 +32,7 @@ def transform(self, summaries: dict[date, str]) -> list[Document]:
                 + (day + timedelta(days=1)).strftime("%Y-%m-%d"),
                 text=summary,
                 metadata={
-                    "date": datetime.combine(
-                        day, datetime.min.time(), tzinfo=timezone.utc
-                    ).timestamp(),
+                    "date": day.strftime("%Y-%m-%d"),
                 },
             )
             summary_docs.append(document)