Remove assert for solver overlap (#119)

This PR removes an assert which checked that solvers do only appear in
one of prod and barn. Instead, a warning is logged.

Even though in most cases a solver appearing in prod and barn is a sign
of invalid solver behavior, the rest of the code of this repo does not
depend on this assumption. Data is just concatenated and uploaded as is.

The [main rewards
query](https://github.com/cowprotocol/dune-queries/blob/main/cowprotocol/accounting/rewards/mainnet/mainnet_dashboard_query_2510345.sql)
on dune also does not depend on associating settlements to environments.
The environment is only added after aggregating payments
[here](https://github.com/cowprotocol/dune-queries/blob/6be6c1cfaa78b3dfc2ed65494c2cc0ef5c303889/cowprotocol/accounting/rewards/mainnet/mainnet_dashboard_query_2510345.sql#L118)
for easier digestion of the final table.

src/fetch/orderbook.py

@@ -12,9 +12,12 @@
 from sqlalchemy import create_engine
 from sqlalchemy.engine import Engine
 
+from src.logger import set_log
 from src.models.block_range import BlockRange
 from src.utils import open_query
 
+log = set_log(__name__)
+
 MAX_PROCESSING_DELAY = 10
 
 
@@ -95,8 +98,13 @@ def get_order_rewards(cls, block_range: BlockRange) -> DataFrame:
             cow_reward_query_prod, cow_reward_query_barn, data_types
         )
 
-        # Solvers do not appear in both environments!
-        assert set(prod.solver).isdisjoint(set(barn.solver)), "solver overlap!"
+        # Warn if solver appear in both environments.
+        if not set(prod.solver).isdisjoint(set(barn.solver)):
+            log.warning(
+                f"solver overlap in {block_range}: solvers "
+                f"{set(prod.solver).intersection(set(barn.solver))} part of both prod and barn"
+            )
+
         if not prod.empty and not barn.empty:
             return pd.concat([prod, barn])
         if not prod.empty:
@@ -142,8 +150,13 @@ def get_batch_rewards(cls, block_range: BlockRange) -> DataFrame:
             cow_reward_query_prod, cow_reward_query_barn, data_types
         )
 
-        # Solvers do not appear in both environments!
-        assert set(prod.solver).isdisjoint(set(barn.solver)), "solver overlap!"
+        # Warn if solver appear in both environments.
+        if not set(prod.solver).isdisjoint(set(barn.solver)):
+            log.warning(
+                f"solver overlap in {block_range}: solvers "
+                f"{set(prod.solver).intersection(set(barn.solver))} part of both prod and barn"
+            )
+
         if not prod.empty and not barn.empty:
             return pd.concat([prod, barn])
         if not prod.empty: