增加支付逻辑

backend/internal/migrations/sql/0007_wechat_native_payments.sql

@@ -0,0 +1,32 @@
+-- Orders are written before calling WeChat. Keep them when a user or
+-- organization is deleted so paid money cannot lose its audit trail.
+create table if not exists public.payment_orders (
+  id text primary key check (length(id) between 1 and 32 and id ~ '^[A-Za-z0-9_-]+$'),
+  organization_id text not null references public.platform_organizations(id) on delete restrict,
+  account_id text not null references public.platform_users(id) on delete restrict,
+  request_key text not null check (length(request_key) between 1 and 64 and request_key ~ '^[A-Za-z0-9_-]+$'),
+  mch_id text not null check (length(mch_id) between 1 and 64),
+  app_id text not null check (length(app_id) between 1 and 64),
+  amount_fen bigint not null check (amount_fen between 1 and 1000000),
+  currency text not null check (currency = 'CNY'),
+  status text not null default 'pending' check (status in ('pending', 'paid', 'closed')),
+  code_url text,
+  transaction_id text,
+  created_at timestamptz not null default now(),
+  updated_at timestamptz not null default now(),
+  expires_at timestamptz not null,
+  paid_at timestamptz,
+  constraint payment_orders_paid_fields_check check (
+    (status = 'paid' and transaction_id is not null and length(transaction_id) > 0 and paid_at is not null)
+    or (status <> 'paid' and transaction_id is null and paid_at is null)
+  ),
+  constraint payment_orders_expiry_check check (expires_at > created_at),
+  constraint payment_orders_org_request_unique unique (organization_id, request_key)
+);
+
+create unique index if not exists payment_orders_provider_transaction_unique
+  on public.payment_orders(mch_id, transaction_id) where transaction_id is not null;
+create index if not exists payment_orders_org_created_idx
+  on public.payment_orders(organization_id, created_at desc);
+create index if not exists payment_orders_pending_check_idx
+  on public.payment_orders(updated_at, created_at) where status = 'pending';