The demo you are looking at runs on one VPS. These diagrams live in DiagramBlock: each block holds an editable draw.io, Excalidraw or drawDB source and is rendered here as plain SVG. Click one to zoom.
Hosting
Browser CDN static assets Load balancer App server 1 PHP-FPM App server 2 PHP-FPM Redis cache (sessions) Database MariaDB Job queue (mail, webhooks) https assets async Requests from the browser to the database
Orders
Start Collect the input Valid? yes Save and notify no Show the errors Done What happens after a purchase
Data model
wp_posts π ID BIGINT post_author BIGINT post_date DATETIME post_date_gmt DATETIME post_content LONGTEXT post_title TEXT post_excerpt TEXT post_status VARCHAR comment_status VARCHAR ping_status VARCHAR post_password VARCHAR post_name VARCHAR to_ping TEXT pinged TEXT post_modified DATETIME post_modified_gmt DATETIME post_content_filtered LONGTEXT post_parent BIGINT guid VARCHAR menu_order INT post_type VARCHAR post_mime_type VARCHAR comment_count BIGINT wp_postmeta π meta_id BIGINT post_id BIGINT meta_key VARCHAR meta_value LONGTEXT wp_users π ID BIGINT user_login VARCHAR user_pass VARCHAR user_nicename VARCHAR user_email VARCHAR user_url VARCHAR user_registered DATETIME user_activation_key VARCHAR user_status INT display_name VARCHAR wp_usermeta π umeta_id BIGINT user_id BIGINT meta_key VARCHAR meta_value LONGTEXT wp_terms π term_id BIGINT name VARCHAR slug VARCHAR term_group BIGINT wp_term_taxonomy π term_taxonomy_id BIGINT term_id BIGINT taxonomy VARCHAR description LONGTEXT parent BIGINT count BIGINT wp_term_relationships π object_id BIGINT π term_taxonomy_id BIGINT term_order INT wp_comments π comment_ID BIGINT comment_post_ID BIGINT comment_author TINYTEXT comment_author_email VARCHAR comment_author_url VARCHAR comment_author_IP VARCHAR comment_date DATETIME comment_date_gmt DATETIME comment_content TEXT comment_karma INT comment_approved VARCHAR comment_agent VARCHAR comment_type VARCHAR comment_parent BIGINT user_id BIGINT wp_commentmeta π meta_id BIGINT comment_id BIGINT meta_key VARCHAR meta_value LONGTEXT wp_options π option_id BIGINT option_name VARCHAR option_value LONGTEXT autoload VARCHAR wp_postmeta.post_id wp_usermeta.user_id wp_term_taxonomy.term_id wp_comments.user_id wp_commentmeta.comment_id Imported from the live WordPress database