@mytec: iter3.5.0 ready for testing

backend/app/services/coverage_service.py

@@ -247,6 +247,9 @@ class CoverageSettings(BaseModel):
     temperature_c: float = 15.0
     humidity_percent: float = 50.0
 
+    # Fading margin (dB) — additional safety loss subtracted from RSRP
+    fading_margin: float = 0.0
+
     # Preset
     preset: Optional[str] = None  # fast, standard, detailed, full
 
@@ -1362,7 +1365,8 @@ class CoverageService:
         rsrp = (site.power + site.gain - path_loss - antenna_loss
                 - terrain_loss - building_loss - veg_loss
                 - rain_loss - indoor_loss - atmo_loss
-                + reflection_gain)
+                + reflection_gain
+                - settings.fading_margin)
 
         return CoveragePoint(
             lat=lat, lon=lon, rsrp=rsrp, distance=distance,
@@ -1508,7 +1512,8 @@ class CoverageService:
                         )
 
                 rsrp = (site.power + site.gain - path_loss
-                        - antenna_loss - terrain_loss)
+                        - antenna_loss - terrain_loss
+                        - settings.fading_margin)
 
                 if rsrp >= settings.min_signal:
                     points.append(CoveragePoint(