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save checkpoint: save features

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# PostgreSQL Backend for Rekor Metadata
## Module
devops
## Status
VERIFIED
## Description
PostgreSQL-based Rekor backend with checkpoint storage, submission queue tables, and VEX-Rekor linkage migration.
## Implementation Details
- **Rekor Inclusion Proof Models**: `src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Rekor/RekorInclusionProof.cs` -- model for Rekor inclusion proof data including log index, root hash, tree size, and inclusion hashes.
- **Enhanced Rekor Proof Builder**: `src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Rekor/EnhancedRekorProofBuilder.cs` (with partials `.Build.cs`, `.Validate.cs`) -- builds and validates Rekor inclusion proofs, storing metadata for PostgreSQL persistence.
- **Pipeline Rekor Entry**: `src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Pipeline/RekorEntry.cs` -- pipeline model for Rekor transparency log entries.
- **Rekor Inclusion Verification**: `src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Verification/RekorInclusionVerificationStep.cs` -- verification step that validates Rekor inclusion proofs against stored checkpoints.
- **Database Cluster Config**: `devops/database/postgres/cluster-production.yaml`, `cluster-staging.yaml` -- PostgreSQL cluster definitions for CloudNativePG with Rekor metadata tables.
- **Database Pooler Config**: `devops/database/postgres/pooler-production.yaml`, `pooler-staging.yaml` -- PgBouncer pooler configurations for Rekor query workloads.
- **Compose Configuration**: `devops/compose/docker-compose.stella-ops.yml` -- includes PostgreSQL service configuration for the Rekor backend.
## E2E Test Plan
- [ ] Submit a DSSE attestation through the proof chain pipeline and verify the Rekor entry metadata (log index, root hash, tree size) is persisted to PostgreSQL
- [ ] Query the stored Rekor checkpoint and verify it matches the transparency log state at submission time
- [ ] Verify Rekor inclusion proof validation: retrieve a stored proof from PostgreSQL and run `RekorInclusionVerificationStep` to confirm it validates correctly
- [ ] Verify the submission queue processes entries in order and marks them as submitted after successful Rekor log inclusion
- [ ] Deploy the PostgreSQL cluster configuration and verify the database schema includes the required Rekor metadata tables
## Verification
- Verified on 2026-02-11 with `run-001`.
- Tier 0 source checks passed for Rekor proof models/builders, verification step, and DevOps PostgreSQL assets.
- Tier 1 build and focused behavioral test gates passed (`57/57`) across Rekor inclusion proof, receipt generation/verification, and verification-job integration suites.
- Tier 2 behavioral checks passed by applying the initial PostgreSQL schema in Docker and validating required tables/indexes for `proofchain.rekor_entries` and `attestor.rekor_submission_queue`.
- Evidence:
- `docs/qa/feature-checks/runs/devops/postgresql-backend-for-rekor-metadata/run-001/tier0-source-check.json`
- `docs/qa/feature-checks/runs/devops/postgresql-backend-for-rekor-metadata/run-001/tier1-build-check.json`
- `docs/qa/feature-checks/runs/devops/postgresql-backend-for-rekor-metadata/run-001/tier2-integration-check.json`