Persistence and sync

# Persistence and sync

- **What is canonical, and how does a write commit?** [Record and write path](record-and-write-path.md).
- **How does legacy compatibility enter, roll through the fleet, and leave?** [Legacy lifecycle](legacy-lifecycle.md).
- **How is the browser cache reconciled?** [Cache and reconciliation](cache-and-reconciliation.md).
- **What happens on the client and at edge cases?** [Client and edge cases](client-and-edge-cases.md).
- **How do master and clients replicate?** [Replication](replication.md).
- **What is the current research and scaling boundary?** [Research and scaling](research-and-scaling.md).
- **Which invariants hold sync together?** [Sync foundations](sync-foundations.md).

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