Search Engine & Full-Text Priority: P1 (OPERATIONAL) - Pattern : CQRS (Command Query Responsibility Segregation) . - Write : To Primary Database (Postgres/MySQL). Source of Truth. - Read (Complex) : To Search Engine (Elasticsearch, OpenSearch, MeiliSearch). Optimized for filtering, fuzzy search, and aggregation. Synchronization ( Hard Part) - Dual Write (Anti-Pattern) : . - Why : Partial failures leave data inconsistent. Slows down HTTP response. - Event-Driven (Recommended) : 1. Service writes to DB. 2. Service emits . 3. Event Handler (Async) pushes to Queue (BullMQ). 4. Worker indexes docu…