feat: add eventually consistent metadata store for cross-replica coordination#229
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…dination Introduces the metadatadb package, providing generic redis-like data structures (Scalar, Int, Set, Map, List) backed by a pluggable storage layer. Mutations apply locally immediately and sync periodically via a lock-load-replay-store cycle. Includes memory and S3 backends, a reusable test suite, and a soak test with monotonic invariant verification. Also extracts MinIO Docker test helpers into internal/minitest for reuse across cache and metadatadb S3 tests. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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This will initially be used for tracking a repo access histogram, but we
can also reuse this for a simpler version of the cache-invalidation (#38)
design.
Introduces the metadatadb package, providing generic redis-like data
structures (Scalar, Int, Set, Map, IntMap, List) backed by a pluggable storage
layer. Mutations apply locally immediately and sync periodically via a
lock-load-replay-store cycle. Includes memory and S3 backends, a
reusable test suite, and a soak test with monotonic invariant
verification.
Also extracts MinIO Docker test helpers into internal/minitest for
reuse across cache and metadatadb S3 tests.
Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com