Complete backend infrastructure and authentication system

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

backend/app/models/host.py

@@ -0,0 +1,21 @@
+from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, JSON
+from sqlalchemy.orm import relationship
+from datetime import datetime
+
+from app.core.database import Base
+
+
+class Host(Base):
+    __tablename__ = "hosts"
+
+    id = Column(Integer, primary_key=True, index=True)
+    hostname = Column(String, index=True, nullable=False)
+    ip_address = Column(String, nullable=True)
+    os = Column(String, nullable=True)
+    tenant_id = Column(Integer, ForeignKey("tenants.id"), nullable=False)
+    host_metadata = Column(JSON, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    last_seen = Column(DateTime, default=datetime.utcnow)
+
+    # Relationships
+    tenant = relationship("Tenant", back_populates="hosts")