DFD_Level_0.drawio: Context-Level Data Flow Diagram (DFD Level 0), centered "OLX Clone System" process, single encompassing circle, primary data interactions visualized, external entities: User (left), Firebase Services (right), interconnected data flows, User entity detailed with profile icon, Firebase Services specified as a cloud icon, Authentication Service subprocess with a lock icon, Firestore Database subprocess with a database icon, Storage Service subprocess with a file cabinet icon, directional arrows indicating data flow, arrow labels: encrypted login credentials, verified user profiles, arrow labels: product listings (detailed descriptions and high-resolution product images), secure database storage, arrow labels: product views (user interaction data), Firestore real-time updates, arrow labels: purchase actions (transaction details, payment confirmations), secure ledger updates, arrow labels: chat messages (real-time chat messages), encrypted communication channels, diagram optimized for clarity, visual hierarchy emphasized, minimalistic infographic design style, sans-serif font for readability, monochromatic color scheme for professional appeal, clean lines, arrow consistency, organized layout, Confluence page integration, interactive diagram elements for enhanced user experience, version control annotations, data governance compliance standards | Anything