# Final Full-System Simulation Validation Matrix

**Date:** 2026-08-15  
**Phase:** 7 — Full end-to-end regression & CI gate  
**Validation branch:** `feat/full-system-simulation-final-validation`  
**Pull request:** #135  
**Primary validation run:** Foundation CI #474 (`31866668369`)  
**Validated code head:** `c56d7bf5be118bdd19c40d219cacf377ce9f8d2c`

## Final result

**PASS — no remaining simulation blocker.**

The full deterministic microfinance simulation can be created from a fresh database, seeded twice without duplicating or invalidating its controlled state, and independently reconciled on both SQLite and MySQL 8.0.

## CI matrix

| Gate | Result | Evidence |
|---|---|---|
| Full PHPUnit suite | PASS | Foundation CI #474 `test` |
| SQLite full simulation | PASS | Fresh migration + standard seed + full simulation seed twice + `simulation:validate --json` |
| MySQL 8.0 full simulation | PASS | Fresh migration + standard seed + full simulation seed twice + `simulation:validate --json` |
| MySQL migrations & performance preflight | PASS | Foundation CI #474 `mysql-migrations` |
| Production configuration/cache gate | PASS | Foundation CI #474 `production-config` |
| Release verification | PASS | Foundation CI #474 `release-verification`, including operational health and backup/restore drill |

## Independent simulation controls

The final validator returned PASS for every control on MySQL and the equivalent SQLite gate passed the same sequence.

| Area | Control | Expected | Result |
|---|---|---:|---|
| Foundation | Simulation branches | 3 | PASS |
| Foundation | Representative staff | 13 | PASS |
| Foundation | Customers | 12 | PASS |
| Foundation | Financial accounts | 15 | PASS |
| Finance | Closing account balance | TZS 223,772,000.00 | PASS |
| Profit & Loss | Total income | TZS 722,666.68 | PASS |
| Profit & Loss | Total expenses | TZS 2,280,000.00 | PASS |
| Profit & Loss | Net profit/loss | TZS -1,557,333.32 | PASS |
| Cash flow | Net cash flow | TZS 223,772,000.00 | PASS |
| Portfolio | Active loans | 7 | PASS |
| Portfolio | Principal outstanding | TZS 6,170,666.68 | PASS |
| Portfolio | Total outstanding | TZS 7,045,000.00 | PASS |
| Portfolio | Total overdue | TZS 585,000.00 | PASS |
| Portfolio | PAR | 8.10% | PASS |
| Accounting | Trial balance | Balanced | PASS |
| Accounting | Statement of financial position | Balanced | PASS |
| Accounting | Statement assets | TZS 232,442,666.68 | PASS |
| Loan reporting | Active loans | 7 | PASS |
| Loan reporting | Outstanding principal | TZS 6,170,666.68 | PASS |
| Fixed assets | Asset count | 1 | PASS |
| Fixed assets | Acquisition cost | TZS 2,500,000.00 | PASS |
| Fixed assets | Accumulated depreciation | TZS 100,000.00 | PASS |
| Fixed assets | Net book value | TZS 2,400,000.00 | PASS |
| Operations | Known overdue reference loan | Present | PASS |
| Operations | Manual task | Present | PASS |
| Operations | Appointments | 2 | PASS |
| Operations | Reminder log | Present | PASS |
| Operations | Management alert | Present | PASS |
| Security | Controlled login attempts | 2 | PASS |
| Authorization | Branch isolation | Enforced | PASS |

## Defect found during Phase 7

The first MySQL simulation gate exposed a database-specific restructuring guard defect. A restructuring request stored `previous_schedule` as JSON and approval compared the decoded schedule to the active schedule with PHP's order-sensitive strict array comparison. MySQL native JSON storage can reorder object keys, while SQLite text storage preserves insertion order, causing a false stale-schedule rejection on MySQL.

**Resolution:** `LoanRestructuringService` now canonicalizes both schedule snapshots before strict equality comparison. Canonicalization normalizes key order, IDs/versions, dates, monetary values and status while preserving installment order and all business values. Foundation CI #474 then passed the full MySQL double-seed simulation and all other gates.

## Phase coverage

- Phase 0 — inventory & control design: PASS
- Phase 1 — deterministic simulation foundation: PASS
- Phase 2 — loan lifecycle & customer risk: PASS
- Phase 3 — advanced loan adjustments: PASS
- Phase 4 — accounting & operational finance: PASS
- Phase 5 — operational surfaces: PASS
- Phase 6 — reports & dashboard reconciliation: PASS
- Phase 7 — full end-to-end regression & CI gate: PASS

## Exit decision

The simulation program satisfies the Phase 7 exit criteria: reproducible full-system simulation, SQLite and MySQL coverage, independent financial/portfolio/operations controls, idempotent reseeding, full regression coverage, production configuration validation and release verification. No simulation-specific blocker remains open.
