first commit

backend/app/models/backup.py

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+from sqlalchemy import Column, DateTime, ForeignKey, Integer, String
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.db.session import Base
+
+
+class Backup(Base):
+    __tablename__ = "backups"
+
+    id = Column(Integer, primary_key=True, index=True)
+    router_id = Column(Integer, ForeignKey("routers.id"), nullable=False, index=True)
+    file_path = Column(String(500), nullable=False)
+    file_name = Column(String(255), nullable=False)
+    backup_type = Column(String(50), nullable=False, default="export")
+    checksum = Column(String(64), nullable=True)
+    created_at = Column(DateTime, server_default=func.now(), nullable=False)
+
+    router = relationship("Router", back_populates="backups")