HYPERFLEET-1432 - docs: add desire store on API Postgres spike

[pnguyen44]

HYPERFLEET-1432

Spike doc evaluating whether the desire store can run on the API's existing Postgres instance as a JSONB document channel instead of a separate backend. Provisional recommendation: share API Postgres; schema/role setup is low-risk, shared capacity is gated on dedup (HYPERFLEET-1428) and a production-sized concurrent load test.

Changes

• Added spike doc: JSONB feasibility (CAS, partition listing, prefix delete), write-split via DB roles, load/headroom numbers, deployment footprint, shared vs separate comparison, schema and role sketch
• Added Desire Store glossary entry (cross-links Desire Identity spike and this spike)
• Cross-linked DSL v2 resource ordering spike (authoring vs transport layers)

Validation

POC scripts used to gather numbers (not intended for merge): pnguyen44/hyperfleet-api HYPERFLEET-1432/postgres-desire-store-spike, hack/spike/HYPERFLEET-1432/

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ℹ️ Recent review info

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Configuration used: Central YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Enterprise

Run ID: f005562b-f3a3-4f6d-891b-07424ac176f8

📥 Commits

Reviewing files that changed from the base of the PR and between d9dab33 and 1f7d293.

📒 Files selected for processing (1)

• hyperfleet/docs/desire-store-api-postgres-spike.md

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• openshift-hyperfleet/architecture (manual)
• openshift-hyperfleet/hyperfleet-api (manual)
• openshift-hyperfleet/hyperfleet-sentinel (manual)
• openshift-hyperfleet/hyperfleet-adapter (manual)
• openshift-hyperfleet/hyperfleet-broker (manual)

🚧 Files skipped from review as they are similar to previous changes (1)

• hyperfleet/docs/desire-store-api-postgres-spike.md

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📝 Walkthrough

Summary by CodeRabbit

• Documentation
  • Added a technical evaluation of running the Desire Store on API Postgres, including performance findings, deployment trade-offs, schema validation, and a provisional recommendation.
  • Linked the resource-ordering spike to the related Desire Store evaluation.
  • Added a glossary definition for “Desire Store” and updated the glossary metadata date.

Walkthrough

Added an API Postgres desire-store spike document. It records database capabilities, workload measurements, API contention, deployment comparisons, schema, indexes, and role grants. Added limitations for deduplication and per-cluster row isolation. Added cross-references and a glossary definition for Desire Store.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 1f7d2

This PR adds and cross-links a design spike and glossary documentation without changing product behavior or runtime configuration. No actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: ciaranroche, ma-hill

🚥 Pre-merge checks | ✅ 11

✅ Passed checks (11 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the documentation change and the API PostgreSQL desire store spike.
Description check	✅ Passed	The description directly explains the spike, recommendation, related documentation, and validation details.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Sec-02: Secrets In Log Output	✅ Passed	The diff changes documentation only. Targeted searches found no slog, log, logr, zap, or fmt.Print* statements, so no sensitive value is logged.
No Hardcoded Secrets	✅ Passed	The PR adds only Markdown docs and SQL examples; scans found no credential URLs, private keys, long base64 strings, or literal secret assignments. No CWE-798 issue.
No Weak Cryptography	✅ Passed	The PR changes only Markdown documentation and SQL role sketches; the introduced diff contains no MD5, DES, RC4, SHA-1, ECB, custom crypto, or secret comparisons.
No Injection Vectors	✅ Passed	The diff adds or edits only Markdown docs and a static SQL schema sketch; it introduces no SQL concatenation, fmt.Sprintf, exec.Command, template.HTML, or yaml.Unmarshal path.
No Privileged Containers	✅ Passed	The PR diff against origin/main changes only three Markdown documents; it adds no Kubernetes/OpenShift manifest, Helm template, or Dockerfile privilege settings.
No Pii Or Sensitive Data In Logs	✅ Passed	PR changes only three Markdown documents; the added lines contain no slog, logr, zap, log, or fmt.Print* logging statements and expose no logged PII or request/response bodies.

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Actionable comments posted: 2

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Inline comments:
In `@hyperfleet/docs/desire-store-api-postgres-spike.md`:
- Around line 86-99: Replace the global applier_role table grants with
authorization scoped to each management cluster’s partition_key, using
per-cluster identities plus row-level security or separately scoped credentials.
Ensure appliers can only select and update rows for their assigned partition_key
while retaining status/version write restrictions, and add negative tests
confirming cross-partition SELECT and UPDATE are denied.
- Around line 72-79: Update the desires table schema and related API logic to
enforce the six-field identity (managementCluster, type, group, resource,
namespace, and name), using either separately stored primary-key fields or a
documented, escaped, unambiguous desire_key encoding that prevents collisions
across kinds. Add validation for the documented RFC 1123 partition_key format
and 63-character maximum via a CHECK constraint, and add tests covering encoding
or key uniqueness and invalid partition keys.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Central YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Enterprise

Run ID: 3acc565d-79b6-4a25-ad53-119b059abcb7

📥 Commits

Reviewing files that changed from the base of the PR and between 0c20f64 and d9dab33.

📒 Files selected for processing (3)

• hyperfleet/docs/desire-store-api-postgres-spike.md
• hyperfleet/docs/dsl-v2-resource-ordering-spike.md
• hyperfleet/docs/glossary.md

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• openshift-hyperfleet/architecture (manual)
• openshift-hyperfleet/hyperfleet-api (manual)
• openshift-hyperfleet/hyperfleet-sentinel (manual)
• openshift-hyperfleet/hyperfleet-adapter (manual)
• openshift-hyperfleet/hyperfleet-broker (manual)

Included review availability: Your plan includes up to 12 reviews per rolling hour; 11 remain after this review.