Harbor is an open-source, cloud-native container registry platform for managing OCI/Docker images, Helm charts, and other artifacts. It provides a full-stack solution with a Go backend, Angular web portal, PostgreSQL database, and Redis/ValKey job queue. The system supports artifact storage, vulnerability scanning (Trivy integration), SBOM generation, multi-registry replication (Docker Hub, Quay, JFrog, cloud CRs), tag retention policies, immutable tags, RBAC with LDAP/OIDC, robot accounts, webhook/notification pipelines, P2P preheat, and audit logging. The architecture follows a layered pattern: REST API handlers (v2.0) → controllers → managers → DAOs, with middleware chains for security, quota, and content trust. Key entry points include the core API server, job service for background tasks, registry controller for blob/manifest management, and the Angular portal for administration. External dependencies include PostgreSQL, Redis, Trivy scanner, and various cloud registry APIs. The codebase is well-structured with extensive unit and integration tests, though it exhibits some technical debt from generated mocks and legacy components.