Align branding, prompts, and deployment tooling

backend/data/market_store.py

@@ -244,6 +244,20 @@ class MarketStore:
             "last_news_fetch": None,
         }
 
+    def get_latest_news_date(self, symbol: str) -> str | None:
+        """Return the latest stored published news date for one ticker."""
+        with self._connect() as conn:
+            row = conn.execute(
+                """
+                SELECT MAX(substr(nr.published_utc, 1, 10)) AS latest_date
+                FROM news_ticker nt
+                JOIN news_raw nr ON nr.id = nt.news_id
+                WHERE nt.symbol = ?
+                """,
+                (symbol,),
+            ).fetchone()
+        return str(row["latest_date"]).strip() if row and row["latest_date"] else None
+
     def upsert_ohlc(self, symbol: str, rows: Iterable[dict[str, Any]], *, source: str = "polygon") -> int:
         timestamp = _utc_timestamp()
         count = 0