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Completes FLUID-WP-0003. The evidence store is append-only at the database, not by convention in Go: a trigger blocks UPDATE and DELETE on fluid_events in both SQLite and Postgres, so the guarantee binds a psql session and the CLI equally, not just callers who go through the Go API. Records are derived summary state and may be superseded; the event log stays the authority. The intent store makes a recorded version immutable and content addressed, since reassigning what governed a revision after the fact would break the one audit question Blueprint 27 exists to answer. The unfilled InterfaceEvolutionIntent template is rejected rather than defaulted, because a template still listing every FLUID-N mode has not been completed and defaulting it would pick a permissive authority by accident. The CLI reads the evidence store directly rather than through the control-plane API, so an operator can reconstruct history when the control plane is down. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014KmVxhJ35tCo7rE7UnLwWu Assistant: claude-code Assistant-Model: opus Assistant-Process: 1116572@bnt-lap001 Assistant-Session: 8ba9bb93-a72a-4883-b189-2499cce5c400
146 lines
3.5 KiB
Markdown
146 lines
3.5 KiB
Markdown
---
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id: FLUID-WP-0003
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type: workplan
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title: "Deterministic data plane (Blueprint Phase A)"
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domain: infotech
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repo: fluid-core
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status: active
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owner: worsch
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topic_slug: fluid-core
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created: "2026-09-04"
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updated: "2026-09-04"
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planning_priority: high
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planning_order: 2
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depends_on:
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- FLUID-WP-0002
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state_hub_workstream_id: "d9ce8eae-cd6f-5c43-a20b-eee8cc89b172"
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---
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# FLUID-WP-0003 - Deterministic data plane
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The production request path. No AI, no analysis, no dependency on the control
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plane. Blueprint §5 and §34: the gateway must keep serving when everything
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above it is dead.
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## T01 - Edge gateway
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```task
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id: FLUID-WP-0003-T01
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status: done
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priority: high
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state_hub_task_id: "0dac6ab6-f3e4-5234-bb3c-2393558d8590"
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```
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Transport termination, correlation IDs, coarse rate limiting, request size and
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shape limits. Blueprint §5.1 — the gateway must not invent interface semantics.
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## T02 - Revision resolver
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```task
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id: FLUID-WP-0003-T02
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status: done
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priority: high
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state_hub_task_id: "6d8333ac-1bad-59a4-943d-b83819c8127a"
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```
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The §5.2 precedence chain: explicit revision, bound client contract, experiment
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assignment, stable default. Every resolution records its reason; resolution
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without an auditable reason is a defect.
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## T03 - Revision router
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```task
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id: FLUID-WP-0003-T03
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status: done
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priority: high
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state_hub_task_id: "1f042c4f-9e3f-50fa-985c-e4f2ebb3b38a"
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```
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Map a resolved revision to an adapter upstream. Reject unpublished, failed,
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ineligible and retired revisions (§5.3). Allocation rules are deterministic and
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read from routing policy the router does not author.
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## T04 - Contract validator
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```task
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id: FLUID-WP-0003-T04
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status: todo
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priority: high
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state_hub_task_id: "70bae578-d3e3-5a00-b5cd-4c363bc5b473"
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```
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OpenAPI 3.1 request and response validation (§5.4). The contract digest is part
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of the revision artifact and is content-addressed.
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## T05 - Backend connector layer
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```task
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id: FLUID-WP-0003-T05
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status: done
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priority: high
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state_hub_task_id: "0d62a681-3154-50af-894a-98b35db7b040"
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```
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Timeout, retry, circuit breaker, error mapping, tenant propagation (§5.6). The
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adapter is an upstream process reached over HTTP — this is where the
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language-agnostic promise is kept.
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## T06 - Response policy
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```task
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id: FLUID-WP-0003-T06
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status: done
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priority: medium
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state_hub_task_id: "cc3c2a03-b24c-51de-b695-8aa9bfae85ab"
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```
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Structured errors carrying a FLUID correlation reference, leaking no backend
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detail (§5.7).
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## T07 - Telemetry emitter
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```task
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id: FLUID-WP-0003-T07
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status: done
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priority: high
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state_hub_task_id: "e10a5011-cb7e-5f1c-9a0d-0cfd2d535d13"
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```
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Fire-and-forget emission. Blueprint §34.2 is a hard invariant: telemetry
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backpressure must never block or slow a request. Test it under a stalled sink.
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## T08 - Evidence store
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```task
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id: FLUID-WP-0003-T08
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status: done
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priority: high
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state_hub_task_id: "1773c7bf-9400-576e-9e74-aa210f08e0c4"
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```
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Append-only event storage, SQLite for development and Postgres-ready. Mutable
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summaries exist only as derived views (§26).
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## T09 - Intent store
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```task
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id: FLUID-WP-0003-T09
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status: done
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priority: high
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state_hub_task_id: "23d70a60-14bf-525e-a712-1d3a14111f62"
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```
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Bind every revision to an `InterfaceEvolutionIntent` version (§27), so audit can
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later answer whether a change was valid under the intent that existed when it
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was made.
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## T10 - Operator CLI, first commands
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```task
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id: FLUID-WP-0003-T10
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status: done
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priority: medium
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state_hub_task_id: "ad7d83d7-a088-5ea4-94e7-fa5be49897b9"
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```
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`fluid revision create|publish|list`, `fluid intent show`, `fluid events tail`.
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