PoC 3.6: Unit Run Canteens (Air-Gapped POS & Edge Indenting)

Functional Objective: Covers the ~4,500 Unit Run Canteens (URCs) operating in forward, naval, air, and peace stations. Features Provisional Demand (PD) indenting to Area Depots, offline-first POS billing on embedded business-local (.deb) terminals, Defence Smart Card / CSD Beneficiary quota validation, 50% GST concession calculations, ESC/POS thermal printing, and cryptographically signed (Ed25519) background outbox sync with MeghRaj Cloud.

🎥 PoC Video Demonstration

Air-Gapped URC Offline POS Billing & Asymmetric Outbox Sync

Demonstrates 100% offline POS cashier checkout, smart card quota enforcement, 50% GST discount, thermal printing, and seamless background sync upon network reconnection.

📋 Core Functional Capabilities

Provisional Demand (PD) Cycle: Indent submission (1st–3rd of month) based on historical off-take and available URC budget.
Offline-First POS Checkout: Local cashier PIN login, item barcode scanning, rank-based quota enforcement (liquor units and grocery limits), and instant invoice generation with 0ms network latency.
Defence Concession & GST: Automated 50% GST rebate computation and CSD profit margin deductions compliant with Ministry of Defence regulations.
Zero-Secret Asymmetric Sync: Transactions signed locally with device Ed25519 private key; relayed to MeghRaj cloud via outbox micro-batches without exposing cloud DB credentials on disk.

🏗️ Technical Architecture & DocType Mapping

In Business M and Framework M, this domain is powered by native, metadata-driven DocTypes, async controllers, and distributed ledger adapters:

Active Business M DocTypes

Outlet, CustomerOrder, SalesInvoice, DeliveryConfirmation, Member, MasterDataProjection, StockOutboxEntry

graph LR
    User["Stakeholder Portal / Desk"] --> Gateway["API Gateway"]
    Gateway --> Controller["Domain Controller & RBAC"]
    Controller --> DB[("PostgreSQL / RLS Master")]
    Controller --> Relay["Outbox Relay Worker"]
    Relay --> TB[("TigerBeetle Immutable Ledger")]

🧪 Verifiable Test Script (Human Review Flow)

Follow these steps in the running Business M instance to replicate the live PoC demonstration:

Access Domain Desk: Log into the web desk or local POS at the designated endpoint for this role.
Execute Transaction Flow: Follow the standard maker-checker workflow to create and submit the source document.
Verify Audit Trail & Ledger: Inspect the generated transfer ID, status transitions, and read-model balances.
Inspect Air-Gapped Sync (if applicable): Ensure zero cloud secrets on disk and verify cryptographic signing.