Independent monitor + checker for CHANGE_CURRENT_LD1 variation

python_app/hardware_full/kamil_adc/laser.py

@@ -86,12 +86,38 @@ def apply_kamil_adc_laser_control(config: RunConfigModel) -> bool:
                     "delay_time": variation.delay_time,
                 },
             )
+            _write_variation_session(variation)
             return True
         raise RuntimeError(f"Unsupported laser_control mode: {laser.mode}")
     finally:
         controller.disconnect()
 
 
+def _write_variation_session(variation) -> None:
+    """Freeze the variation's static temperature targets for the checker.
+
+    Best-effort: a failure to write the session snapshot must never abort the
+    acquisition setup, so any error is logged and swallowed.
+    """
+    from datetime import datetime
+
+    try:
+        from python_app.hardware_full.laser_control.monitoring.session import (
+            LaserVariationSession,
+        )
+
+        LaserVariationSession(
+            variation_type=variation.variation_type,
+            target_temp1=variation.static_temp1,
+            target_temp2=variation.static_temp2,
+            tolerance_c=variation.temp_tolerance_c,
+            started_at_iso=datetime.now().isoformat(timespec="seconds"),
+        ).save()
+        logger.debug("Wrote laser variation session snapshot for the temperature checker")
+    except Exception:  # noqa: BLE001 — session snapshot is auxiliary, never fatal
+        logger.warning("Failed to write laser variation session snapshot", exc_info=True)
+
+
 def _validate_laser_control_config(config: RunConfigModel) -> None:
     laser = config.radar.laser_control
     if not laser.port: