feat: add email verification

backend/app/models/user.py

@@ -1,4 +1,4 @@
-from sqlalchemy import Column, Integer, String, Boolean, DateTime
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 from app.database import Base
@@ -15,3 +15,16 @@ class User(Base):
     created_at = Column(DateTime(timezone=True), server_default=func.now())
 
     projects = relationship("Project", back_populates="owner")
+    email_verifications = relationship("EmailVerification", back_populates="user", cascade="all, delete-orphan")
+
+class EmailVerification(Base):
+    __tablename__ = "email_verifications"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    token_hash = Column(String, index=True, nullable=False)
+    expires_at = Column(DateTime(timezone=True), nullable=False)
+    is_used = Column(Boolean, default=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    user = relationship("User", back_populates="email_verifications")