PRD-024: Simulation & Replay Platform

Document Type

Product Requirements Document (PRD)

Status

Approved

Satisfies

Executive Summary

Provide deterministic “what-if” scenario execution against semantic state snapshots, enabling governance teams to validate policy changes, test semantic model updates, and generate pre-emptive evidence before production deployment.

Goals

  1. Validate before deploy — Test policy/model changes against historical data
  2. Generate evidence — Produce audit-ready artifacts for governance review
  3. Train Pattern Oracle — Feed simulation outcomes into temporal memory
  4. Compare production — Diff simulated vs actual outcomes for learning

User Stories

US-024-001: Policy Simulation

As a governance officer I want to simulate a policy change against the last 30 days of data So that I can predict impact before approving the change

Acceptance Criteria:

US-024-002: Manifest Replay

As a developer I want to replay a manifest against a production snapshot So that I can verify code generation behavior matches expectations

Acceptance Criteria:

US-024-003: Evidence Bundle Generation

As an auditor I want to receive simulation results as tamper-evident evidence So that I can include them in compliance documentation

Acceptance Criteria:

US-024-004: Pattern Learning

As a system operator I want simulation results to feed the Pattern Oracle So that the system learns from both real and simulated scenarios

Acceptance Criteria:

Functional Requirements

ID Requirement Priority
REQ-SIM-001 System SHALL accept (manifest, snapshot, scenario) as simulation inputs P0
REQ-SIM-002 System SHALL produce deterministic outputs for identical inputs P0
REQ-SIM-003 System SHALL NOT mutate production state during simulation P0
REQ-SIM-004 System SHALL produce evidence bundles compatible with SDS-047 P0
REQ-SIM-005 System SHALL support scenario scripting in YAML/JSON format P1
REQ-SIM-006 System SHALL support diff comparison against production traces P1
REQ-SIM-007 System SHALL rate-limit concurrent simulations per tenant P1
REQ-SIM-008 System SHALL integrate with Pattern Oracle for learning P2

Non-Functional Requirements

ID Requirement Metric
NFR-SIM-001 Simulation execution latency < 5s for 1K entity snapshots
NFR-SIM-002 Snapshot storage retention Configurable, default 90 days
NFR-SIM-003 Determinism verification 100% reproducibility on re-run
NFR-SIM-004 Evidence integrity SHA256 hash verification on retrieval

Dependencies

Dependency Type Description
SDS-015 Required Temporal Database for pattern storage
SDS-030 Required Observability envelope for trace comparison
SDS-047 Required GovernedSpeed™ for evidence submission
REF-011 Required Manifest schema for simulation inputs
SDS-050 Required Identity for evidence hashing

Success Metrics

Metric Target Measurement
Policy changes validated pre-deploy 80% Change requests with simulation
Production incidents from untested changes -50% Incident correlation analysis
Simulation determinism failures 0% Re-run comparison tests
Evidence bundles accepted by audit 100% Audit review acceptance rate

Out of Scope

Type ID Document
ADR ADR-036 Simulation and Replay Architecture
SDS SDS-053 Simulation and Replay Service (TBD)