Show HN: Typesync, schema-first Firestore tooling that now validates stored data

Hi HN, I’ve been working on Typesync, an open-source CLI for Firestore projects. The basic idea is that you define your Firestore models once in YAML or JSON, then generate the boring parts from that: - TypeScript models - Python/Pydantic models - Swift models - Firestore Security Rules validators - Mermaid diagrams of the document structure The new command I added is `validate-data`. It walks selected Firestore collections and validates existing documents against Zod validators generated from the same schema. It reports the documents that don’t match. Example: ```bash typesync validate-data \ --definition 'definition/*/*.yml' \ --model User \ --model Post \ --serviceAccount ./service-account.json ```