Add Lake model

models/lake.py

@@ -0,0 +1,14 @@
+from sqlalchemy import Column, String, Float, DateTime
+from sqlalchemy.sql import func
+from core.database import Base
+import uuid
+
+class Lake(Base):
+    __tablename__ = "lakes"
+    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
+    name = Column(String, nullable=False, index=True)
+    area = Column(Float, nullable=False)
+    depth = Column(Float, nullable=False)
+    location = Column(String, nullable=False)
+    created_at = Column(DateTime, default=func.now())
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())