perf: batch paid CMPP accounting and weighted routes

api/src/billing/billing.service.spec.ts

@@ -13,10 +13,12 @@ function createPrismaMock() {
     tenantAccount: {
       findMany: jest.fn(),
       findUnique: jest.fn().mockImplementation(() => Promise.resolve({ ...accountState })),
+      findUniqueOrThrow: jest.fn().mockImplementation(() => Promise.resolve({ ...accountState })),
       create: jest.fn(),
       upsert: jest.fn().mockImplementation(() => Promise.resolve({ ...accountState })),
       updateMany: jest.fn().mockImplementation(({ data }) => {
         if (data.balanceCents?.increment !== undefined) accountState.balanceCents += data.balanceCents.increment;
+        else if (data.balanceCents?.decrement !== undefined) accountState.balanceCents -= data.balanceCents.decrement;
         accountState.updatedAt = new Date(accountState.updatedAt.getTime() + 1);
         return Promise.resolve({ count: 1 });
       }),
@@ -31,7 +33,9 @@ function createPrismaMock() {
       findMany: jest.fn(),
       findFirst: jest.fn(),
       findUnique: jest.fn().mockResolvedValue(null),
+      findUniqueOrThrow: jest.fn().mockImplementation(({ where }) => Promise.resolve({ id: 'tx-charged', idempotencyKey: where.idempotencyKey })),
       create: jest.fn().mockImplementation(({ data }) => Promise.resolve({ id: `tx-${data.transactionType}`, ...data })),
+      createMany: jest.fn().mockResolvedValue({ count: 2 }),
     },
     rechargeOrder: {
       findMany: jest.fn(),
@@ -94,7 +98,7 @@ describe('BillingService', () => {
     );
   });
 
-  it('allows sending only when cash balance plus credit is greater than zero', async () => {
+  it('allows sending only when cash balance plus credit covers the required amount', async () => {
     const prisma = createPrismaMock();
     const service = new BillingService(prisma as never);
 
@@ -102,7 +106,7 @@ describe('BillingService', () => {
       expect.objectContaining({ availableAmount: 1000, canSend: true }),
     );
     await expect(service.checkAccount({ tenantId: 'tenant-1', amountCents: 1001 })).resolves.toEqual(
-      expect.objectContaining({ availableAmount: 1000, canSend: true }),
+      expect.objectContaining({ availableAmount: 1000, canSend: false }),
     );
     await service.updateCreditLimit('tenant-1', { creditCents: -1000, operatorId: 'admin-1' });
     await expect(service.checkAccount({ tenantId: 'tenant-1', amountCents: 1 })).resolves.toEqual(
@@ -110,7 +114,7 @@ describe('BillingService', () => {
     );
     await service.updateCreditLimit('tenant-1', { creditCents: 500, operatorId: 'admin-1' });
     await expect(service.checkAccount({ tenantId: 'tenant-1', amountCents: 999999 })).resolves.toEqual(
-      expect.objectContaining({ availableAmount: 1500, creditCents: 500, canSend: true }),
+      expect.objectContaining({ availableAmount: 1500, creditCents: 500, canSend: false }),
     );
     await expect(service.updateCreditLimit('tenant-1', { creditCents: 1.5 })).rejects.toThrow('授信额度最多支持人民币小数点后 4 位');
     expect(prisma.operationLog.create).toHaveBeenCalledWith({
@@ -312,6 +316,27 @@ describe('BillingService', () => {
     expect(prisma.accountState).toEqual(expect.objectContaining({ balanceCents: 890 }));
   });
 
+  it('settles a frozen SMS charge with one account lock and an idempotent ledger pair', async () => {
+    const prisma = createPrismaMock();
+    const rows = new Map<string, Record<string, unknown>>();
+    prisma.accountTransaction.findUnique.mockImplementation(({ where }) => Promise.resolve(rows.get(where.idempotencyKey) ?? null));
+    prisma.accountTransaction.findUniqueOrThrow.mockImplementation(({ where }) => Promise.resolve(rows.get(where.idempotencyKey)));
+    prisma.accountTransaction.createMany.mockImplementation(({ data }) => {
+      data.forEach((row: Record<string, unknown>) => rows.set(String(row.idempotencyKey), { id: `tx-${row.transactionType}`, ...row }));
+      return Promise.resolve({ count: data.length });
+    });
+    const service = new BillingService(prisma as never);
+    const input = { tenantId: 'tenant-1', amountCents: 325, messageId: 'msg-paid-1', taskId: 'task-paid-1' };
+
+    const first = await service.settleFrozenCharge(input);
+    const replay = await service.settleFrozenCharge(input);
+
+    expect(first).toEqual(expect.objectContaining({ transactionType: 'charged', amountCents: -325 }));
+    expect(replay).toEqual(first);
+    expect(prisma.accountTransaction.createMany).toHaveBeenCalledTimes(1);
+    expect(prisma.tenantAccount.update).not.toHaveBeenCalled();
+  });
+
   it('serializes and replays concurrent refunds with one balance mutation', async () => {
     const prisma = createPrismaMock();
     let transactionChain = Promise.resolve<unknown>(undefined);