Chunk 1.1

## Chunk Summary In this final segment, the assistant focused on completing and verifying the scalable S3 architecture implementation. The user identified that each Kuri node requires **two separate database connections**—one for its own per-node RIBS keyspace (groups, deals, blockstore) and one for the shared S3 metadata keyspace used by all nodes and proxies. This required adding a `S3CqlConfig` to the configuration system, creating a `S3CqlDB` wrapper type, and wiring dual CQL connections through the Kuri plugin's dependency injection. The codebase now correctly supports **1 shared S3 keyspace + N per-node RIBS keyspaces** as specified in the roadmap. The assistant then systematically staged all changes into **14 logical git commits** covering configuration, interfaces, the Kuri S3 plugin, dual CQL connections, the S3 frontend proxy package, build system, test cluster infrastructure, documentation, CQL schema migrations, and endpoint fixes. Critical bugs were fixed: the `S3Objects` table schema was updated to include `node_id` and `expires_at`, a `MultipartUploads` table was created for cross-node coordination, a `/healthz` endpoint was added to the Kuri S3 server for proxy health checks, and `X-Node-ID` response headers were implemented for client-side node identification. The Docker image was rebuilt successfully with all fixes integrated. **Key theme:** The architecture now correctly implements the roadmap's three-layer hierarchy—stateless S3 frontend proxies on port 8078 (scalable horizontally) → independent Kuri storage nodes (each with isolated RIBS data) → shared YugabyteDB (with per-node keyspaces for blockstore data and a shared keyspace for S3 object routing). The test cluster is ready for startup with `./start.sh /data/fgw2`, which will include interactive first-time initialization.

The Architecture That Wouldn't Stay Dead: How 14 Commits, Two Database Connections, and a Handful of Schema Fixes Rescued a Distributed S3 System 2057 words

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