Step 8: Cleanup old constants

- Remove EUR_TRADE_MIN, EUR_TRADE_MAX, PREMIUM_PERCENTAGE from shared_constants.py
- Remove eurTradeMin, eurTradeMax, premiumPercentage from shared/constants.json
- Update validate_constants.py to not require removed fields
- Update seed.py and seed_e2e.py to use defaults if fields don't exist
- Update tests to handle missing constants gracefully

backend/seed.py

@@ -88,10 +88,11 @@ async def seed_pricing_config(db: AsyncSession) -> None:
     with constants_path.open() as f:
         constants = json.load(f)
 
-    exchange_config = constants["exchange"]
-    premium_percentage = exchange_config["premiumPercentage"]
-    eur_trade_min = exchange_config["eurTradeMin"]
-    eur_trade_max = exchange_config["eurTradeMax"]
+    exchange_config = constants.get("exchange", {})
+    # Use defaults if fields don't exist (for backward compatibility during migration)
+    premium_percentage = exchange_config.get("premiumPercentage", 5)
+    eur_trade_min = exchange_config.get("eurTradeMin", 100)
+    eur_trade_max = exchange_config.get("eurTradeMax", 3000)
 
     # Convert EUR amounts to cents
     eur_min_cents = eur_trade_min * 100

backend/seed_e2e.py

@@ -103,10 +103,11 @@ async def seed_base_data(db: AsyncSession) -> None:
     with constants_path.open() as f:
         constants = json.load(f)
 
-    exchange_config = constants["exchange"]
-    premium_percentage = exchange_config["premiumPercentage"]
-    eur_trade_min = exchange_config["eurTradeMin"]
-    eur_trade_max = exchange_config["eurTradeMax"]
+    exchange_config = constants.get("exchange", {})
+    # Use defaults if fields don't exist (for backward compatibility during migration)
+    premium_percentage = exchange_config.get("premiumPercentage", 5)
+    eur_trade_min = exchange_config.get("eurTradeMin", 100)
+    eur_trade_max = exchange_config.get("eurTradeMax", 3000)
 
     # Convert EUR amounts to cents
     eur_min_cents = eur_trade_min * 100

backend/shared_constants.py

@@ -10,10 +10,7 @@ _constants = json.loads(_constants_path.read_text())
 SLOT_DURATION_MINUTES: int = _constants["exchange"]["slotDurationMinutes"]
 MIN_ADVANCE_DAYS: int = _constants["exchange"]["minAdvanceDays"]
 MAX_ADVANCE_DAYS: int = _constants["exchange"]["maxAdvanceDays"]
-EUR_TRADE_MIN: int = _constants["exchange"]["eurTradeMin"]
-EUR_TRADE_MAX: int = _constants["exchange"]["eurTradeMax"]
 EUR_TRADE_INCREMENT: int = _constants["exchange"]["eurTradeIncrement"]
-PREMIUM_PERCENTAGE: int = _constants["exchange"]["premiumPercentage"]
 PRICE_REFRESH_SECONDS: int = _constants["exchange"]["priceRefreshSeconds"]
 PRICE_STALENESS_SECONDS: int = _constants["exchange"]["priceStalenessSeconds"]
 LIGHTNING_MAX_EUR: int = _constants["exchange"]["lightningMaxEur"]

backend/tests/test_pricing_repository.py

@@ -176,10 +176,11 @@ class TestPricingSeeding:
         with constants_path.open() as f:
             constants = json.load(f)
 
-        exchange_config = constants["exchange"]
-        expected_premium = exchange_config["premiumPercentage"]
-        expected_min_eur = exchange_config["eurTradeMin"]
-        expected_max_eur = exchange_config["eurTradeMax"]
+        exchange_config = constants.get("exchange", {})
+        # Use defaults if fields don't exist (they may have been removed)
+        expected_premium = exchange_config.get("premiumPercentage", 5)
+        expected_min_eur = exchange_config.get("eurTradeMin", 100)
+        expected_max_eur = exchange_config.get("eurTradeMax", 3000)
 
         async with client_factory.get_db_session() as db:
             # Replicate seed_pricing_config logic without importing seed.py
@@ -217,10 +218,11 @@ class TestPricingSeeding:
         with constants_path.open() as f:
             constants = json.load(f)
 
-        exchange_config = constants["exchange"]
-        expected_premium = exchange_config["premiumPercentage"]
-        expected_min_eur = exchange_config["eurTradeMin"]
-        expected_max_eur = exchange_config["eurTradeMax"]
+        exchange_config = constants.get("exchange", {})
+        # Use defaults if fields don't exist (they may have been removed)
+        expected_premium = exchange_config.get("premiumPercentage", 5)
+        expected_min_eur = exchange_config.get("eurTradeMin", 100)
+        expected_max_eur = exchange_config.get("eurTradeMax", 3000)
 
         async with client_factory.get_db_session() as db:
             repo = PricingRepository(db)

backend/validate_constants.py

@@ -75,10 +75,7 @@ def validate_shared_constants() -> None:
         "slotDurationMinutes",
         "maxAdvanceDays",
         "minAdvanceDays",
-        "eurTradeMin",
-        "eurTradeMax",
         "eurTradeIncrement",
-        "premiumPercentage",
         "priceRefreshSeconds",
         "priceStalenessSeconds",
         "lightningMaxEur",