Fix CI sensor check to query September 2025 data

June 2025 has no data in the InfluxDB sandbox; actual test data
is from September 2025.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: wfr-data-acquisition

dev-utils/ci/slicks-sensor-check.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 """
-CI check: use slicks to discover sensors for June 2025.
+CI check: use slicks to discover sensors for September 2025.
 
 Verifies the sandbox's InfluxDB connection and that the slicks
 package can reach the database and return a non-empty sensor list.
@@ -17,15 +17,15 @@
 
 def main() -> None:
     sensors = slicks.discover_sensors(
-        start_time=datetime(2025, 6, 1),
-        end_time=datetime(2025, 7, 1),
+        start_time=datetime(2025, 9, 1),
+        end_time=datetime(2025, 10, 1),
     )
 
     if not sensors:
-        print("FAIL: discover_sensors returned an empty list for June 2025.")
+        print("FAIL: discover_sensors returned an empty list for September 2025.")
         sys.exit(1)
 
-    print(f"OK: Found {len(sensors)} sensors for June 2025:")
+    print(f"OK: Found {len(sensors)} sensors for September 2025:")
     for name in sensors:
         print(f"  - {name}")