fix(scada): verify first sample after field completion

tests/unit/test_scada_repository.py

@@ -1,5 +1,5 @@
 import asyncio
-from datetime import datetime, timezone
+from datetime import datetime, timedelta, timezone
 import importlib.util
 from pathlib import Path
 
@@ -172,3 +172,27 @@ def test_get_latest_scada_readings_skips_database_for_empty_page():
 
     assert asyncio.run(ScadaRepository.get_latest_scada_readings(conn, [])) == {}
     assert conn.cursor_instance.calls == []
+
+
+def test_recovery_read_selects_first_raw_frame_strictly_after_feedback_and_bounded_reference():
+    ScadaRepository = _load_scada_repository()
+    incident = datetime(2026, 7, 16, 0, 0, tzinfo=timezone.utc)
+    feedback = incident + timedelta(hours=5, minutes=7)
+    through = feedback + timedelta(hours=2)
+    rows = [{"time": incident - timedelta(days=1), "device_id": "P1", "monitored_value": 100., "cleaned_value": None},
+            {"time": incident + timedelta(hours=5, minutes=15), "device_id": "P1", "monitored_value": 100., "cleaned_value": None}]
+    conn = _ReadingConnection(rows)
+    result = asyncio.run(ScadaRepository.get_recovery_scada_readings(conn, ["P1"], incident, feedback, through))
+    assert result == rows
+    query, parameters = conn.cursor_instance.calls[0]
+    assert "min(time)" in query and "time>%s AND time<=%s" in query
+    assert "time>=%s AND time<%s" in query and "JOIN next_frame" in query
+    assert parameters == (["P1"], feedback, through, ["P1"], incident - timedelta(days=15), incident, 100_001, ["P1"])
+
+
+def test_recovery_read_does_not_query_when_feedback_is_not_in_the_past():
+    ScadaRepository = _load_scada_repository()
+    at = datetime(2026, 7, 16, tzinfo=timezone.utc)
+    conn = _ReadingConnection([])
+    assert asyncio.run(ScadaRepository.get_recovery_scada_readings(conn, ["P1"], at, at, at)) == []
+    assert conn.cursor_instance.calls == []