updated the architecture

app/models/webhook.py

@@ -0,0 +1,21 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import Boolean, Column, DateTime, ForeignKey, String
+from sqlalchemy.orm import relationship
+
+from app.database import Base
+
+
+class Webhook(Base):
+    __tablename__ = "webhooks"
+
+    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
+    user_id = Column(String, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    target_url = Column(String, nullable=False)
+    secret_key = Column(String, nullable=True) # Used for HMAC signing
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+    # Relationship
+    user = relationship("User", back_populates="webhooks")