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This document summarizes the development and maintenance of a large web application called Arcos over 2.5 years. It includes: - Details on the codebase which includes nearly 80,000 lines of Perl code, 4,900 lines of SQL, and uses over 140 modules. - The key features of Arcos including a CMS, e-commerce, data warehouse, email campaigns, job queue, and reporting. - Challenges around deployment including managing dependencies, upgrades, testing, and configuration. - Approaches to version control, releases, maintenance, and testing the application.























