Implement data persistence using SQLite with Dapper, JSON files, or event sourcing.Use when: "database", "save data", "store", "CRUD", "create table", "query", "SQL","SQLite", "Dapper", "file storage", "JSON file", "event sourcing", "persistence","read from database", "write to database", "data access", "repository".Creates code in src/Server/Persistence.fs with async I/O patterns.