Initial commit: AutonetSellCar platform with deployment system

- Frontend: Next.js 14 with TypeScript
- Backend: FastAPI with SQLAlchemy
- Agent: Carmodoo sync agent
- Deployment: Docker Compose based staging/production setup
- Scripts: Automated deployment with rollback support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/models/exchange_rate.py

@@ -0,0 +1,46 @@
+"""
+Exchange Rate Model - 환율 정보 저장
+"""
+from sqlalchemy import Column, Integer, String, Float, DateTime, Boolean
+from sqlalchemy.sql import func
+from ..database import Base
+
+
+class ExchangeRate(Base):
+    """환율 정보 테이블"""
+    __tablename__ = "exchange_rates"
+
+    id = Column(Integer, primary_key=True, index=True)
+
+    # 통화 정보
+    currency_code = Column(String(10), unique=True, index=True)  # USD, MNT, RUB, CNY
+    currency_name = Column(String(100))  # 미국 달러, 몽골 투그릭 등
+
+    # 환율 정보 (한국수출입은행 기준)
+    deal_base_rate = Column(Float)  # 매매기준율 (1 USD = X KRW)
+    ttb_rate = Column(Float)  # 전신환(송금) 받을때
+    tts_rate = Column(Float)  # 전신환(송금) 보낼때
+
+    # 가중치 적용 환율
+    weight_percent = Column(Float, default=0.0)  # 관리자 설정 가중치 (%)
+    adjusted_rate = Column(Float)  # 가중치 적용된 환율
+
+    # 메타 정보
+    source_date = Column(String(20))  # 수출입은행 기준일 (예: 20241223)
+    is_active = Column(Boolean, default=True)
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+
+
+class ExchangeRateHistory(Base):
+    """환율 변동 이력 테이블"""
+    __tablename__ = "exchange_rate_history"
+
+    id = Column(Integer, primary_key=True, index=True)
+
+    currency_code = Column(String(10), index=True)
+    deal_base_rate = Column(Float)
+    source_date = Column(String(20))
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())