broke out assets.py into an assets and sensors directory

user_code/sensors/gtfs_realtime.py

@@ -0,0 +1,61 @@
+from dagster import (
+    sensor,
+    RunRequest,
+    SkipReason,
+    SensorEvaluationContext,
+    DefaultSensorStatus,
+)
+from dagster_duckdb import DuckDBResource
+
+
+@sensor(
+    name="gtfs_rt_vehicles_sensor",
+    minimum_interval_seconds=60,
+    asset_selection=["gtfs_rt_vehicles_downloads"],
+    default_status=DefaultSensorStatus.RUNNING
+)
+def gtfs_rt_vehicles_sensor(
+    context: SensorEvaluationContext,
+    duckdb: DuckDBResource,
+) -> list[RunRequest] | SkipReason:
+    """
+    Sensor that triggers gtfs_rt_vehicles_downloads every 60 seconds.
+    Fetches feed metadata once and passes it to each partition run.
+    """
+    with duckdb.get_connection() as conn:
+        # Get all active feeds with their metadata in one query
+        feeds = conn.execute("""
+            SELECT feed_id, provider, producer_url
+            FROM gtfs_rt_vehicles_metadata
+            WHERE producer_url IS NOT NULL AND producer_url != ''
+            ORDER BY feed_id
+        """).fetchall()
+
+        if not feeds:
+            return SkipReason("No GTFS-RT vehicle feeds configured")
+
+        # Create a RunRequest for each partition with metadata
+        run_requests = [
+            RunRequest(
+                partition_key=feed_id,
+                run_config={
+                    "ops": {
+                        "gtfs_rt_vehicles_downloads": {
+                            "config": {
+                                "provider": provider,
+                                "producer_url": producer_url,
+                            }
+                        }
+                    }
+                },
+                tags={
+                    "feed_id": feed_id,
+                    "sensor": "gtfs_rt_vehicles_sensor"
+                }
+            )
+            for feed_id, provider, producer_url in feeds
+        ]
+
+        context.log.info(f"Triggering downloads for {len(run_requests)} GTFS-RT vehicle feeds")
+
+        return run_requests