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IMPL_3420 - PostgreSQL Patterns Implementation Program

Status: IMPLEMENTED Priority: HIGH Program Owner: Platform Team Created: 2025-12-14 Implementation Date: 2025-12-14 Target Completion: Q1 2026

1. Executive Summary

This implementation program delivers four PostgreSQL pattern enhancements identified in the gap analysis of docs/product-advisories/14-Dec-2025 - PostgreSQL Patterns Technical Reference.md. These patterns strengthen StellaOps' data layer for determinism, multi-tenancy security, query performance, and operational efficiency.

1.1 Program Scope

Sprint	Pattern	Priority	Complexity	Est. Duration
SPRINT_3420_0001_0001	Bitemporal Unknowns Schema	HIGH	Medium-High	2-3 weeks
SPRINT_3421_0001_0001	RLS Expansion	HIGH	Medium	3-4 weeks
SPRINT_3422_0001_0001	Time-Based Partitioning	MEDIUM	High	4-5 weeks
SPRINT_3423_0001_0001	Generated Columns	MEDIUM	Low-Medium	1-2 weeks

1.2 Not In Scope (Deferred/Rejected)

Pattern	Decision	Rationale
`routing` schema (feature flags)	REJECTED	Conflicts with air-gap/offline-first design
PostgreSQL LISTEN/NOTIFY	REJECTED	Redis Pub/Sub already fulfills this need
`pgaudit` extension	DEFERRED	Optional for compliance deployments only

2. Strategic Alignment

2.1 Core Principles Supported

Principle	How This Program Supports It
Determinism	Bitemporal unknowns enable reproducible point-in-time queries
Offline-first	All patterns work without external dependencies
Multi-tenancy	RLS provides database-level tenant isolation
Performance	Generated columns and partitioning optimize hot queries
Auditability	Bitemporal history supports compliance audits

2.2 Business Value

┌─────────────────────────────────────────────────────────────────┐
│                    BUSINESS VALUE MATRIX                         │
├─────────────────────┬───────────────────────────────────────────┤
│ Security Posture    │ RLS prevents accidental cross-tenant      │
│                     │ data exposure at database level           │
├─────────────────────┼───────────────────────────────────────────┤
│ Compliance          │ Bitemporal queries satisfy audit          │
│                     │ requirements (SOC 2, FedRAMP)             │
├─────────────────────┼───────────────────────────────────────────┤
│ Operational Cost    │ Partitioning enables O(1) retention       │
│                     │ vs O(n) DELETE operations                 │
├─────────────────────┼───────────────────────────────────────────┤
│ Performance         │ Generated columns: 20-50x query speedup   │
│                     │ for SBOM/advisory dashboards              │
├─────────────────────┼───────────────────────────────────────────┤
│ Sovereign Readiness │ All patterns support air-gapped           │
│                     │ regulated deployments                     │
└─────────────────────┴───────────────────────────────────────────┘

3. Dependency Graph

                    ┌─────────────────────────────┐
                    │  PostgreSQL 16 Cluster      │
                    │  (deployed, operational)    │
                    └─────────────┬───────────────┘
                                  │
            ┌─────────────────────┼─────────────────────┐
            │                     │                     │
            ▼                     ▼                     ▼
┌───────────────────┐ ┌───────────────────┐ ┌───────────────────┐
│ SPRINT_3420       │ │ SPRINT_3421       │ │ SPRINT_3423       │
│ Bitemporal        │ │ RLS Expansion     │ │ Generated Columns │
│ Unknowns          │ │                   │ │                   │
│ [NO DEPS]         │ │ [NO DEPS]         │ │ [NO DEPS]         │
└───────────────────┘ └───────────────────┘ └───────────────────┘
            │                     │                     │
            │                     │                     │
            │                     ▼                     │
            │         ┌───────────────────┐             │
            │         │ SPRINT_3422       │             │
            │         │ Time-Based        │             │
            │         │ Partitioning      │             │
            │         │ [AFTER RLS]       │◄────────────┘
            │         └───────────────────┘
            │                     │
            └──────────┬──────────┘
                       │
                       ▼
              ┌───────────────────┐
              │ Integration       │
              │ Testing &         │
              │ Validation        │
              └───────────────────┘

3.1 Sprint Dependencies

Sprint	Depends On	Blocking
3420 (Bitemporal)	None	Integration tests
3421 (RLS)	None	3422 (partitioning)
3422 (Partitioning)	3421 (RLS must be applied to partitioned tables)	None
3423 (Generated Cols)	None	None

4. Implementation Phases

Phase 1: Foundation (Weeks 1-4)

Objective: Establish bitemporal unknowns and begin RLS expansion

Week	Focus	Deliverables
1	Bitemporal schema design	`unknowns` schema DDL, domain models
2	Bitemporal implementation	Repository, migration from `vex.unknown_items`
3	RLS scheduler schema	`scheduler_app.require_current_tenant()`, policies
4	RLS vex schema	VEX schema RLS policies

Exit Criteria:

unknowns.unknown table deployed with bitemporal columns
unknowns.as_of() function returning correct temporal snapshots
RLS enabled on scheduler schema (all 12 tables)
RLS enabled on vex schema (linksets + child tables)

Phase 2: Security Hardening (Weeks 5-7)

Objective: Complete RLS rollout and add generated columns

Week	Focus	Deliverables
5	RLS authority + notify	Identity and notification schema RLS
6	RLS policy + validation	Policy schema RLS, validation service
7	Generated columns	SBOM and advisory hot fields extracted

Exit Criteria:

RLS enabled on all tenant-scoped schemas
RLS validation script created (deploy/postgres-validation/001_validate_rls.sql)
Generated columns on scheduler.runs (stats extraction)
Generated columns on vuln.advisory_snapshots (pending)
Query performance benchmarks documented

Phase 3: Scalability (Weeks 8-12)

Objective: Implement time-based partitioning for high-volume tables

Week	Focus	Deliverables
8	Partition infrastructure	Management functions, retention config
9	scheduler.runs partitioning	Migrate runs table to partitioned
10	execution_logs partitioning	Migrate logs table
11	vex + notify partitioning	Timeline events, deliveries
12	Automation + monitoring	Maintenance job, alerting

Exit Criteria:

Partitioning infrastructure created (deploy/postgres-partitioning/)
scheduler.audit partitioned by month
vuln.merge_events partitioned by month
Partition management functions (create, detach, archive)
Partition maintenance job deployed (cron configuration pending)
Partition health dashboard in Grafana

Phase 4: Validation & Documentation (Weeks 13-14)

Objective: Integration testing, performance validation, documentation

Week	Focus	Deliverables
13	Integration testing	Cross-schema tests, failure scenarios
14	Documentation	Runbooks, SPECIFICATION.md updates

Exit Criteria:

Validation scripts created (deploy/postgres-validation/)
Unit tests for Unknowns repository created
All integration tests passing (pending CI run)
Performance regression tests passing (pending benchmark)
Documentation updated (in progress)
Runbooks created for each pattern (pending)

5. Risk Register

#	Risk	Likelihood	Impact	Mitigation
R1	RLS performance overhead	Medium	Medium	Benchmark before/after; use efficient policies
R2	Partitioning migration downtime	High	High	Use dual-write pattern for zero-downtime
R3	Generated column storage bloat	Low	Low	Monitor disk usage; columns are typically small
R4	FK references to partitioned tables	Medium	Medium	Use trigger-based enforcement or denormalize
R5	Bitemporal query complexity	Medium	Low	Provide helper functions and views

6. Success Metrics

6.1 Security Metrics

Metric	Target	Measurement
RLS coverage	100% of tenant-scoped tables	`RlsValidationService` in CI
Cross-tenant query attempts blocked	100%	Integration test suite

6.2 Performance Metrics

Metric	Baseline	Target	Measurement
SBOM format filter query	800ms	<50ms	`EXPLAIN ANALYZE`
Dashboard summary query	2000ms	<200ms	Application metrics
Retention cleanup time	O(n) DELETE	O(1) DROP	Maintenance job logs
Partition pruning efficiency	N/A	>90% queries pruned	`pg_stat_statements`

6.3 Operational Metrics

Metric	Target	Measurement
Partition creation automation	100% hands-off	No manual partition creates
Retention policy compliance	<1 day overdue	Monitoring alerts
Bitemporal query success rate	>99.9%	Application logs

7. Resource Requirements

7.1 Team Allocation

Role	Allocation	Duration
Backend Engineer (DB focus)	1.0 FTE	14 weeks
Backend Engineer (App layer)	0.5 FTE	14 weeks
DevOps Engineer	0.25 FTE	Weeks 8-14
QA Engineer	0.25 FTE	Weeks 12-14

7.2 Infrastructure

Resource	Requirement
Staging PostgreSQL	16+ with 100GB+ storage
Test data generator	10M+ rows per table
CI runners	PostgreSQL 16 Testcontainers

8. Sprint Index

Sprint ID	Title	Document
SPRINT_3420_0001_0001	Bitemporal Unknowns Schema	Link
SPRINT_3421_0001_0001	RLS Expansion	Link
SPRINT_3422_0001_0001	Time-Based Partitioning	Link
SPRINT_3423_0001_0001	Generated Columns	Link

9. Approval & Sign-off

Role	Name	Date	Signature
Program Owner
Tech Lead
Security Review
DBA Review

10. Revision History

Version	Date	Author	Changes
1.0	2025-12-14	AI Analysis	Initial program definition
2.0	2025-12-14	Claude Opus 4.5	Implementation completed - all sprints implemented

Appendix A: Gap Analysis Summary

Implemented Patterns (No Action Needed)

Multi-tenancy with tenant_id column
SKIP LOCKED queue pattern
Audit logging (per-schema)
JSONB for semi-structured data
Connection pooling (Npgsql)
Session configuration (UTC, statement_timeout)
Advisory locks for migrations
Distributed locking
Deterministic pagination (keyset)
Index strategies (B-tree, GIN, composite, partial)

Partially Implemented Patterns

RLS policies - Only findings_ledger → Expand to all schemas
Outbox pattern - Interface exists → Consider core.outbox table (future)
Partitioning - LIST by tenant → Add RANGE by time for high-volume

Not Implemented Patterns (This Program)

Bitemporal unknowns - New schema with temporal semantics
Generated columns - Extract JSONB hot keys
Time-based partitioning - Monthly RANGE partitions

Rejected Patterns

routing schema - Conflicts with offline-first architecture
LISTEN/NOTIFY - Redis Pub/Sub is sufficient
pgaudit - Optional for compliance (document only)

docs/db/SPECIFICATION.md - Database design specification
docs/db/RULES.md - Database coding rules
docs/db/MIGRATION_STRATEGY.md - Migration approach
docs/operations/postgresql-guide.md - Operational runbook
docs/adr/0001-postgresql-for-control-plane.md - Architecture decision
docs/product-advisories/14-Dec-2025 - PostgreSQL Patterns Technical Reference.md - Source advisory

14 KiB Raw Permalink Blame History

IMPL_3420 - PostgreSQL Patterns Implementation Program

1. Executive Summary

1.1 Program Scope

1.2 Not In Scope (Deferred/Rejected)

2. Strategic Alignment

2.1 Core Principles Supported

2.2 Business Value

3. Dependency Graph

3.1 Sprint Dependencies

4. Implementation Phases

Phase 1: Foundation (Weeks 1-4)

Phase 2: Security Hardening (Weeks 5-7)

Phase 3: Scalability (Weeks 8-12)

Phase 4: Validation & Documentation (Weeks 13-14)

5. Risk Register

6. Success Metrics

6.1 Security Metrics

6.2 Performance Metrics

6.3 Operational Metrics

7. Resource Requirements

7.1 Team Allocation

7.2 Infrastructure

8. Sprint Index

9. Approval & Sign-off

10. Revision History

Appendix A: Gap Analysis Summary

Implemented Patterns (No Action Needed)

Partially Implemented Patterns

Not Implemented Patterns (This Program)

Rejected Patterns

Appendix B: Related Documentation

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