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## Why Compatible clients need incremental artifact reads for local collections on every Buzz relay. ## What Expose incremental artifact reads and capability discovery on every Buzz relay. ## How Serve incremental queries through the existing authentication and authorization checks. Keep the existing work budgets and the separate WebSocket sync capability. The HTTP test verifies capability discovery and a successful incremental query. ## Risk The relay starts no additional background work. Clients that use incremental reads consume database capacity. The net database load is not yet measured. Serving writers must maintain the modification timestamps. ## Testing Read-only SQL checks on November 3, 2026 verify the prerequisites below. Each database records successful migrations 76–78. All five required columns have the expected types, defaults, and nullability. All five indexes have the expected definitions and are valid, ready, and live. | Deployment | Schema and indexes | Running timestamp writers | | --- | --- | --- | | Production `bb-block` | Pass | `f6f6d9a` includes PR 8523 | | Production `bb-public` | Pass | `f3a7bab` includes PR 8523 | | Staging `bb-block` | Pass | `b4509de` includes PR 8523 | The checked columns are `artifact_heads.modified_at`, `artifact_revisions.modified_at`, `artifact_revisions.source_channel_id`, `channel_members.sync_modified_at`, and `communities.artifact_policy_modified_at`. The checked indexes are `idx_artifact_revisions_artifact`, `artifact_heads_modified`, `artifact_heads_channel`, `channel_members_sync`, and `artifact_revisions_moves`. At commit `62b26ad`, all 21 NIP-11 tests and the HTTP capability test pass on Linux with PostgreSQL 17 and Redis. The HTTP test checks capability discovery and a successful incremental query. All required push hooks also pass. No manual testing. Human confirmation remains pending. ## Bigger picture [Client PR 1507](https://github.com/block/buzz-app/pull/1507) uses the advertised capability for local artifact sync. Existing deployments receive this behavior when they deploy the relay version that includes this PR. Generated with Codex --------- Signed-off-by: Daniel Rouleau <drouleau@squareup.com>