BJSN OS
Multi-Site Construction Operating System

1import { db } from "@bjsn/db";
2
3export async function issueGatePass(input: GatePassInput) {
4  return await db.transaction(async (tx) => {
5    // 1. Record gate pass slip with QR code
6    const pass = await tx.gatePasses.create({
7      projectId: input.projectId,
8      siteId: input.siteId,
9      materialId: input.materialId,
10      quantity: input.quantity,
11      vehicleNo: input.vehicleNo,
12      weighbridgeWeight: input.grossWeight - input.tareWeight,
13      qrCode: generateQR(input),
14      timestamp: new Date(),
15    });
16
17    // 2. Debit inventory in real-time
18    await tx.inventory.decrement(input.materialId, pass.weighbridgeWeight);
19
20    // 3. Post to project cost ledger (ACID)
21    await tx.ledger.insert({
22      type: "MATERIAL_DISPATCH",
23      projectId: input.projectId,
24      amount: pass.weighbridgeWeight * input.ratePerUnit,
25    });
26
27    return pass; // All-or-nothing: every module consistent
28  });
29}