Step 2: Add seeding logic for pricing config

- Add seed_pricing_config() function to seed.py
- Seed initial values from shared/constants.json
- Add seeding to seed_e2e.py for E2E tests
- Add tests for seeding functionality

backend/seed_e2e.py

@@ -1,6 +1,8 @@
 """Fast re-seeding function for e2e tests - only seeds essential data."""
 
+import json
 import os
+from pathlib import Path
 
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -13,6 +15,7 @@ from models import (
     Role,
     User,
 )
+from repositories.pricing import PricingRepository
 
 
 async def seed_base_data(db: AsyncSession) -> None:
@@ -95,4 +98,30 @@ async def seed_base_data(db: AsyncSession) -> None:
         admin_user.signal = None
         admin_user.nostr_npub = None
 
+    # Seed pricing config
+    constants_path = Path(__file__).parent.parent / "shared" / "constants.json"
+    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"]
+
+    # Convert EUR amounts to cents
+    eur_min_cents = eur_trade_min * 100
+    eur_max_cents = eur_trade_max * 100
+
+    repo = PricingRepository(db)
+    await repo.create_or_update(
+        premium_buy=premium_percentage,
+        premium_sell=premium_percentage,
+        small_trade_threshold_eur=0,
+        small_trade_extra_premium=0,
+        eur_min_buy=eur_min_cents,
+        eur_max_buy=eur_max_cents,
+        eur_min_sell=eur_min_cents,
+        eur_max_sell=eur_max_cents,
+    )
+
     await db.commit()