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moebiusbandandClaude Opus 5
eaaa7c27a1
Serve central configuration to fleet members from a hand-edited, hierarchical tree of JSON files. Editing redundant options in UI forms was rejected as too tedious, so humans author the tree directly; because options are shared, config is resolved by deep-merging from broad to specific (global -> service_type -> cluster -> host, with the cluster layer skipped for infra-scope members) so a value set once high in the tree is inherited and only overridden where it differs. Pulls never touch the filesystem. A loader parses the whole tree into an immutable snapshot published by an atomic pointer swap, which keeps the hot path allocation-light and lock-free and gives two guarantees while the tree is being edited: a file caught mid-write fails to parse (or its size/mtime changes across the read) so that scan is discarded and the previous good snapshot keeps serving, and a broken edit therefore never reaches running services -- they keep the last known-good generation until the tree parses cleanly again. The revision is an fnv-1a content hash of the merged result, so it changes exactly when the config changes, needs no counter kept in sync with the files, and fits both the config_revision INTEGER column and the existing AckConfig(int64) handshake. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>