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chronogrid/DECISION_LOG.md

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Architectural Decision Log (ADL)

[2026-08-09] - ADL-001: Distributed Local-First System Baseline

  • Status: Accepted
  • Context: Design a multi-platform (Windows, Linux, Android, Headless) productivity engine for time, project, and note management without centralized servers.
  • Decision: Adopted Rust core with SQLCipher local storage, Automerge CRDT delta sync over libp2p, and Flutter presentation layer bound via C-FFI.

[2026-08-09] - ADL-002: chronogrid_crypto Crate – Argon2id KDF & OS Keychain

  • Status: Accepted
  • Context: Task 1.2 required implementing the chronogrid_crypto crate with Argon2id master-key derivation and OS-native keychain bindings per docs/ARCHITECTURE/02-security-and-crypto.md.
  • Decision:
    • Argon2id parameters pinned: 64 MiB memory, 3 iterations, 4 threads, 16-byte random salt, 32-byte output.
    • DerivedKey struct implements Zeroize + Drop to scrub sensitive memory on scope exit.
    • OS keychain abstracted via keyring crate v3 (Windows Credential Manager / DPAPI, Linux SecretService / libsecret). Android keychain is excluded (cfg(not(target_os = "android"))) and will be handled by Flutter KeyStore bridge in Task 1.5.
    • Raw key material is Base64-encoded before credential-store insertion for UTF-8 backend compatibility.
    • Inline Base64 encode/decode helpers avoid adding an external Base64 dependency.