feat(burst-detection): update scada analysis flow

app/infra/db/timescaledb/internal_queries.py

@@ -169,6 +169,38 @@ class InternalQueries:
                 else:
                     raise
 
+    @staticmethod
+    def query_latest_scada_time(
+        device_ids: List[str],
+        before_time: str | datetime | None = None,
+        db_name: str = None,
+        max_retries: int = 3,
+    ) -> datetime | None:
+        """Return the latest SCADA timestamp for the selected devices."""
+        before_dt = (
+            parse_utc_time(before_time, field_name="before_time")
+            if before_time is not None
+            else None
+        )
+        for attempt in range(max_retries):
+            try:
+                conn_string = (
+                    get_timescaledb_pgconn_string(db_name=db_name)
+                    if db_name
+                    else get_timescaledb_pgconn_string()
+                )
+                with psycopg.Connection.connect(conn_string) as conn:
+                    return ScadaRepository.get_latest_scada_time_sync(
+                        conn,
+                        device_ids,
+                        before_dt,
+                    )
+            except Exception:
+                if attempt < max_retries - 1:
+                    time.sleep(1)
+                else:
+                    raise
+
     @staticmethod
     def query_realtime_simulation_by_ids_timerange(
         element_ids: List[str],

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,