feat: add orders

backend/database/migrations/20250410130530_create_orders.sql

@@ -0,0 +1,26 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE orders(
+    id SERIAL8 PRIMARY KEY,
+    created_at timestamp NOT NULL DEFAULT now(),
+    updated_at timestamp NOT NULL DEFAULT now(),
+    order_no varchar(64) NOT NULL,
+    sub_order_no varchar(64) NOT NULL DEFAULT '',
+    transaction_id varchar(64) NOT NULL DEFAULT '',
+    refund_transaction_id varchar(64) NOT NULL DEFAULT '',
+    price int8 NOT NULL DEFAULT 0,
+    discount int2 NOT NULL DEFAULT 100,
+    currency varchar(10) NOT NULL DEFAULT 'CNY',
+    payment_method varchar(50) NOT NULL DEFAULT 'wechatpay',
+    post_id int8 NOT NULL,
+    user_id int8 NOT NULL,
+    status int2 NOT NULL,
+    meta jsonb NOT NULL DEFAULT '{}' ::jsonb
+);
+
+-- +goose StatementEnd
+-- +goose Down
+-- +goose StatementBegin
+DROP TABLE orders;
+
+-- +goose StatementEnd