feat(burst-detection): update scada analysis flow

app/infra/db/timescaledb/repositories/scada.py

@@ -54,6 +54,27 @@ class ScadaRepository:
             )
             return cur.fetchall()
 
+    @staticmethod
+    def get_latest_scada_time_sync(
+        conn: Connection,
+        device_ids: List[str],
+        before_time: datetime | None = None,
+    ) -> datetime | None:
+        with conn.cursor(row_factory=dict_row) as cur:
+            if before_time is None:
+                cur.execute(
+                    "SELECT max(time) AS time FROM scada.scada_data WHERE device_id = ANY(%s)",
+                    (device_ids,),
+                )
+            else:
+                cur.execute(
+                    "SELECT max(time) AS time FROM scada.scada_data "
+                    "WHERE device_id = ANY(%s) AND time <= %s",
+                    (device_ids, before_time),
+                )
+            row = cur.fetchone()
+            return row["time"] if row else None
+
     @staticmethod
     async def get_scada_field_by_id_time_range(
         conn: AsyncConnection,