No service fee on penalties

src/fetch/payouts.py

@@ -137,11 +137,19 @@ def total_outgoing_eth(self) -> int:
 
     def total_cow_reward(self) -> int:
         """Total outgoing COW token reward"""
-        return int(self.reward_scaling() * self.primary_reward_cow)
+        return (
+            int(self.reward_scaling() * self.primary_reward_cow)
+            if self.primary_reward_cow > 0
+            else self.primary_reward_cow
+        )
 
     def total_eth_reward(self) -> int:
         """Total outgoing ETH reward"""
-        return int(self.reward_scaling() * self.primary_reward_eth)
+        return (
+            int(self.reward_scaling() * self.primary_reward_eth)
+            if self.primary_reward_eth > 0
+            else self.primary_reward_eth
+        )
 
     def reward_scaling(self) -> Fraction:
         """Scaling factor for service fee
@@ -152,6 +160,15 @@ def total_service_fee(self) -> Fraction:
         """Total service fee charged from rewards"""
         return self.service_fee * (self.primary_reward_cow + self.quote_reward_cow)
 
+    def total_service_fee(self) -> Fraction:
+        """Scaling factor for service fee
+        The reward is multiplied by this factor"""
+        return (
+            SERVICE_FEE_FACTOR
+            * self.service_fee
+            * (max(self.primary_reward_cow, 0) + self.quote_reward_cow)
+        )
+
     def is_overdraft(self) -> bool:
         """
         True if the solver's complete combined data results in a net negative