perf: optimize portfolio queries and workflows

apps/api/src/movement.ts

@@ -0,0 +1,23 @@
+import Decimal from 'decimal.js';
+import { BadRequestException } from '@nestjs/common';
+export type Movement = 'transfer' | 'borrow' | 'lend' | 'collect' | 'repay';
+export function movementDeltas(operation: Movement, amount: string, received: string, fee: string) {
+  const incoming = operation === 'borrow' || operation === 'collect';
+  const principal = new Decimal(amount),
+    charge = new Decimal(fee),
+    debt = new Decimal(received);
+  if (operation === 'transfer')
+    return {
+      source: principal.plus(charge).neg(),
+      target: debt,
+      sourceReason: 'transfer_out',
+      targetReason: 'transfer_in',
+    };
+  if (incoming && charge.gt(principal)) throw new BadRequestException('收款手续费不能超过收款金额');
+  return {
+    source: incoming ? principal.minus(charge) : principal.plus(charge).neg(),
+    target: operation === 'borrow' || operation === 'lend' ? debt : debt.neg(),
+    sourceReason: 'loan_' + operation,
+    targetReason: 'loan_' + operation,
+  };
+}