first commit

apps/backend/src/modules/transactions/transactions.schema.ts

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+import { z } from 'zod';
+
+const baseTransactionSchema = z.object({
+  title: z.string().min(1),
+  amount: z.coerce.number().min(0),
+  currency: z.string().length(3).default('CNY'),
+  category: z.string().min(1),
+  type: z.enum(['expense', 'income']),
+  source: z.enum(['manual', 'notification', 'ocr', 'ai']).default('manual'),
+  status: z.enum(['pending', 'confirmed', 'rejected']).default('confirmed'),
+  occurredAt: z.coerce.date(),
+  notes: z.string().max(300).optional(),
+  metadata: z.record(z.any()).optional(),
+  userId: z.string().optional()
+});
+
+export const createTransactionSchema = baseTransactionSchema;
+
+export const updateTransactionSchema = baseTransactionSchema.partial();
+
+export const transactionIdSchema = z.object({
+  id: z.string().min(1)
+});
+
+export const notificationSchema = z.object({
+  packageName: z.string().min(1),
+  title: z.string().min(1),
+  body: z.string().min(1),
+  receivedAt: z.coerce.date(),
+  signature: z.string().min(32),
+  extras: z.record(z.any()).optional()
+});
+
+export type CreateTransactionInput = z.infer<typeof createTransactionSchema>;
+export type UpdateTransactionInput = z.infer<typeof updateTransactionSchema>;