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.py

@@ -1,7 +1,9 @@
 """Seed the database with roles, permissions, and dev users."""
 
 import asyncio
+import json
 import os
+from pathlib import Path
 
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -16,6 +18,7 @@ from models import (
     Role,
     User,
 )
+from repositories.pricing import PricingRepository
 
 DEV_USER_EMAIL = os.environ["DEV_USER_EMAIL"]
 DEV_USER_PASSWORD = os.environ["DEV_USER_PASSWORD"]
@@ -78,6 +81,49 @@ async def upsert_user(
     return user
 
 
+async def seed_pricing_config(db: AsyncSession) -> None:
+    """Seed initial pricing configuration from shared/constants.json."""
+    # Load constants from shared/constants.json
+    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)
+    config = await repo.create_or_update(
+        premium_buy=premium_percentage,
+        premium_sell=premium_percentage,
+        small_trade_threshold_eur=0,  # Default: no small trade extra (admin will set)
+        small_trade_extra_premium=0,  # Default: no extra premium
+        eur_min_buy=eur_min_cents,
+        eur_max_buy=eur_max_cents,
+        eur_min_sell=eur_min_cents,
+        eur_max_sell=eur_max_cents,
+    )
+
+    if config.id:  # If config already existed (was updated)
+        print("Updated pricing config")
+    else:
+        print("Created pricing config")
+    print(f"  Premium BUY: {config.premium_buy}%, Premium SELL: {config.premium_sell}%")
+    print(
+        f"  Trade limits BUY: €{config.eur_min_buy / 100:.0f} - "
+        f"€{config.eur_max_buy / 100:.0f}"
+    )
+    print(
+        f"  Trade limits SELL: €{config.eur_min_sell / 100:.0f} - "
+        f"€{config.eur_max_sell / 100:.0f}"
+    )
+
+
 async def seed() -> None:
     async with engine.begin() as conn:
         await conn.run_sync(Base.metadata.create_all)
@@ -99,6 +145,9 @@ async def seed() -> None:
         # Create admin dev user
         await upsert_user(db, DEV_ADMIN_EMAIL, DEV_ADMIN_PASSWORD, [ROLE_ADMIN])
 
+        print("\n=== Seeding Pricing Config ===")
+        await seed_pricing_config(db)
+
         await db.commit()
         print("\n=== Seeding Complete ===\n")