Legacy ERP System — Master Timeline

Complete ILegacy ERPS replacement with Framework M.

Team: 2× 10x developers (LLM-assisted, TDD-focused)

Dev	Focus	Parallel Work
Dev 1	Framework M core	Infrastructure, protocols, adapters
Dev 2	Legacy ERP apps & microservices	WMS, Finance, People, Stock-Keeper

Phase Overview

Week 1-2    │ Week 3-4    │ Week 5-6    │ Week 7-8    │ Week 9-10
────────────┼─────────────┼─────────────┼─────────────┼────────────
Framework   │ WMS Core    │ F&A App     │ P&A App     │ Integration
Foundation  │ + Modules   │             │             │ & Testing

Dev 1: Framework M Track

Core framework + high-throughput services (TigerBeetle from day 1).

Week	Task	Duration	Output
1	DocType system, Repository pattern	2d	Base infrastructure
1	Workflow engine (SubmittableMixin)	1d	State machine
1	Book-Keeper integration	2d	Financial ledger ready
2	Stock-Keeper microservice	3d	Inventory ledger (TigerBeetle)
2	m-ledger dual adapter	2d	Finance + Stock adapters
3	Configure Framework M native CQRS	1d	Real-time projections wired
3	m-hr-core implementation	2d	Employee, Designation
4	Authentication (Citadel IAM)	2d	Multi-tenant auth
4	File upload & Excel processing	2d	Data import foundation
4	Background jobs (Taskiq)	1d	Async processing
5+	Performance tuning, load testing	ongoing	10K TPS validated

Deliverables: Framework M core, Book-Keeper integration, Stock-Keeper microservice

Architecture: Both financial and stock ledgers use TigerBeetle from day 1. No SQL fallback — we’re building for Legacy ERP scale.

Dev 2: Legacy ERP Apps Track

Application development using Framework M.

Architecture Rule: Apps like WMS, finance, CRM, and people are built as independent Plugin Apps. They install over the business-m base app using the Bounded Contexts pattern. No domain-specific fields (e.g., credit limits, lead scores) should ever leak into the base m-core identities.

WMS App (~15 days)

Week	Phase	Duration	Output
1-2	01-master-data	2d	Item, Depot, URC, Supplier
2	02-inventory	3d	StockEntry, SLE, Bin
2-3	03-supply-chain	3d	MaterialRequest, PO, GRN
3	10-data-collection	3d	Excel uploads, variance
4	11-prgo	2d	Demand forecasting
4	12-permits + 13-sdf + 14-bg	2d	Legacy ERP-specific

Finance App (~21 days)

Week	Phase	Duration	Output
5	00-01 Foundation + Masters	3d	Year, VoucherType, Account
5-6	02 Imprest (m-imprest)	3d	Req, Remittance, Statement
6	03 Bank	2d	Statement, Reconciliation
6-7	04-05 Budget + Bills	5d	Allocation, Supplier bills
7	06 General Ledger	2d	JV, Trial Balance
7-8	07-10 Claims + Reports	6d	TA/DA, Dead Stock, EMD

People App (~24 days)

Week	Phase	Duration	Output
8	00-02 Foundation + Employee	4d	Employee master, family
8-9	03-04 Recruitment + Attendance	5d	SSC, Local Panel, Muster
9	05 Leave (m-leave)	3d	Applications, Credits
9-10	06 Medical (m-medical)	3d	Form 97 claims
10	07 Pension (m-pension)	4d	PPPO → FPPO
10+	08-09 Deputationist + Reports	3d	HR reports

Combined Timeline (10 Weeks)

        Dev 1 (Framework)              Dev 2 (Legacy ERP Apps)
        ─────────────────              ─────────────────
Week 1  ▓▓▓▓ DocType/Repo             ░░░░ Setup/Prep
Week 2  ▓▓▓▓ m-ledger + Events        ▓▓▓▓ WMS Master Data
Week 3  ▓▓▓▓ m-hr-core + Auth         ▓▓▓▓ WMS Inventory/SC
Week 4  ▓▓▓▓ File/Excel/Jobs          ▓▓▓▓ WMS Data/PRGO
Week 5  ▓▓▓▓ Stock-Keeper start       ▓▓▓▓ Finance Foundation
Week 6  ▓▓▓▓ Stock-Keeper             ▓▓▓▓ Finance Imprest/Bank
Week 7  ▓▓▓▓ Stock-Keeper complete    ▓▓▓▓ Finance Budget/Bills/GL
Week 8  ▓▓▓▓ Integration support      ▓▓▓▓ People Employee/Recruit
Week 9  ▓▓▓▓ Performance tuning       ▓▓▓▓ People Leave/Medical
Week 10 ▓▓▓▓ Polish + docs            ▓▓▓▓ People Pension/Reports

Directory Index

legacy_erp-phases/
├── timeline.md              ← You are here
├── modules/
│   ├── README.md
│   ├── m-core.md            # Party, Address, Item
│   ├── m-invoice.md         # Invoicing
│   ├── m-india.md           # GST
│   ├── m-ledger.md          # Book-Keeper adapter
│   ├── m-hr-core.md         # Employee, Designation
│   ├── m-imprest.md         # Cash/Imprest
│   ├── m-leave.md           # Leave management
│   ├── m-medical.md         # Medical claims
│   └── m-pension.md         # Pension lifecycle
├── stock-keeper/            # NEW: Microservice
│   └── README.md            # TigerBeetle-backed stock ledger
├── wms/
│   ├── README.md
│   ├── 00-foundation.md
│   ├── 01-master-data.md
│   ├── 02-inventory.md
│   ├── 03-supply-chain.md
│   ├── 04-deployment.md
│   ├── 05-frontend.md
│   ├── 06-product-onboarding.md
│   ├── 07-outlet-lifecycle.md
│   ├── 08-supplier-portal.md
│   ├── 09-price-revision.md
│   ├── 10-data-collection.md
│   ├── 11-prgo.md
│   ├── 12-permits.md
│   ├── 13-substitute-denial.md
│   └── 14-bank-guarantee.md
├── finance/
│   └── README.md            # Finance App outline
├── people/
│   └── README.md            # People App outline
└── reference/
    └── ILegacy ERPS.txt            # Legacy system docs

Key Dependencies

graph LR
    subgraph "Dev 1"
        FM[Framework M] --> ML[m-ledger]
        FM --> MH[m-hr-core]
        ML --> SK[Stock-Keeper]
    end

    subgraph "Dev 2"
        ML --> WMS
        MH --> People
        WMS --> Finance
        Finance --> People
    end

Milestones

Week	Milestone	Demo
2	WMS MVP	Stock receipt, balance query
4	WMS Complete	PRGO, permits, variance detection
6	Finance MVP	Imprest, bank reconciliation
8	Finance Complete	Budget, bills, GL
10	People Complete	Leave, medical, pension
10	Full System	100% ILegacy ERPS replacement

Testing Strategy

Unit Tests: Every DocType, service, controller
Integration Tests: API endpoints, workflows
E2E Tests: Playwright for critical flows
Load Tests: k6 for Stock-Keeper throughput

Success Criteria

All ILegacy ERPS modules functional
Stock-Keeper handles 10K TPS
Real-time dashboards via CQRS
Zero data loss during migration
Production-ready in 10 weeks