Update user_id for bigint and update secure

shared/database/models.py

@@ -13,7 +13,7 @@ class User(Base):
     """User model"""
     __tablename__ = "users"
     
-    user_id = Column(Integer, primary_key=True, unique=True, index=True)
+    user_id = Column(BigInteger, primary_key=True, unique=True, index=True)
     username = Column(String(255), nullable=True)
     first_name = Column(String(255), nullable=True)
     last_name = Column(String(255), nullable=True)
@@ -34,7 +34,7 @@ class Task(Base):
     __tablename__ = "tasks"
     
     id = Column(BigInteger, primary_key=True, index=True)
-    user_id = Column(Integer, ForeignKey("users.user_id"), nullable=False, index=True)  # Index for frequent queries
+    user_id = Column(BigInteger, ForeignKey("users.user_id"), nullable=False, index=True)  # Index for frequent queries
     task_type = Column(String(50), nullable=False)  # download, process, etc.
     status = Column(String(50), default="pending", index=True)  # Index for status filtering
     url = Column(Text, nullable=True)
@@ -77,7 +77,7 @@ class OTPCode(Base):
     __tablename__ = "otp_codes"
     
     id = Column(Integer, primary_key=True, index=True)
-    user_id = Column(Integer, ForeignKey("users.user_id"), nullable=False, index=True)
+    user_id = Column(BigInteger, ForeignKey("users.user_id"), nullable=False, index=True)
     code = Column(String(6), nullable=False, index=True)  # 6-digit code
     expires_at = Column(DateTime, nullable=False, index=True)
     used = Column(Boolean, default=False, index=True)