챠트 데이터 웹소켓으로 연결

backend/app/models/models.py

@@ -128,7 +128,8 @@ class MarketData(Base):
     stock_code = Column(String(20), nullable=False, index=True)
     price = Column(Numeric(15, 2), nullable=False)
     change_rate = Column(Numeric(10, 4))
-    volume = Column(Integer)
+    # real‑time volume may also exceed int32; switch to bigint for safety
+    volume = Column(BigInteger)
     high_price = Column(Numeric(15, 2))
     low_price = Column(Numeric(15, 2))
     open_price = Column(Numeric(15, 2))
@@ -190,7 +191,8 @@ class StockAnalysis(Base):
     # 가격 정보
     current_price = Column(Integer, nullable=False)
     change_rate = Column(Numeric(10, 4))
-    volume = Column(Integer)
+    # volumes can exceed 32‑bit limits (e.g. 3 billion+), use bigint to avoid overflow
+    volume = Column(BigInteger)
     
     # 기술적 지표
     rsi = Column(Numeric(10, 4))