MainWP Dashboard is a self-hosted WordPress plugin that enables centralized management of multiple WordPress sites from a single dashboard. It provides a comprehensive admin interface for monitoring site health, managing updates (core, plugins, themes), performing backups, tracking costs, auditing activity logs, and enforcing granular access control via a custom 'Abilities' API. The architecture is modular, with separate subsystems for logs, cost tracking, API backups, and system monitoring, each with their own database tables, REST endpoints, and dashboard widgets. The plugin communicates with child sites via authenticated HTTP requests and supports both legacy and modern REST API versions. It includes an extensive test suite covering security, permissions, and regression scenarios.