Implement Phase 3: Advanced search, real-time notifications, and Velociraptor integration

Co-authored-by: mblanke <9078342+mblanke@users.noreply.github.com>

backend/app/models/notification.py

@@ -0,0 +1,23 @@
+from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, Boolean, Text
+from sqlalchemy.orm import relationship
+from datetime import datetime, timezone
+
+from app.core.database import Base
+
+
+class Notification(Base):
+    __tablename__ = "notifications"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    tenant_id = Column(Integer, ForeignKey("tenants.id"), nullable=False)
+    title = Column(String, nullable=False)
+    message = Column(Text, nullable=False)
+    notification_type = Column(String, nullable=False)  # info, warning, error, success
+    is_read = Column(Boolean, default=False, nullable=False)
+    link = Column(String, nullable=True)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), index=True)
+
+    # Relationships
+    user = relationship("User")
+    tenant = relationship("Tenant")