The Hacker News post discusses a browser-based tool called safe-not-safe that checks PostgreSQL migration files for safety using libpg_query WASM. It shows an example where a migration.sql file with zero statements is analyzed, resulting in no flags. The tool downloads and compiles the PostgreSQL parser in a web worker to parse SQL statements locally.

Users can paste migrations or load samples to test for unsafe operations. The interface displays real-time feedback during parsing and checking. The example demonstrates the tool initializing, processing 301 characters, and finding zero statements to check.

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