feat: 新增四小时核销批次撤回审计与定时备份管理页

server/src/db/schema.sql

@@ -56,3 +56,26 @@ CREATE TABLE IF NOT EXISTS admins (
   password_hash TEXT NOT NULL,
   created_at TEXT NOT NULL DEFAULT (datetime('now','+8 hours'))
 );
+
+CREATE TABLE IF NOT EXISTS four_hour_exports (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  status TEXT NOT NULL DEFAULT 'active',
+  admin_username TEXT,
+  eligible_count INTEGER NOT NULL DEFAULT 0,
+  eligible_hours_total REAL NOT NULL DEFAULT 0,
+  items_updated INTEGER NOT NULL DEFAULT 0,
+  plan_json TEXT,
+  note TEXT,
+  created_at TEXT NOT NULL DEFAULT (datetime('now','+8 hours')),
+  voided_at TEXT
+);
+
+CREATE TABLE IF NOT EXISTS four_hour_export_items (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  export_id INTEGER NOT NULL,
+  hour_id INTEGER NOT NULL,
+  delta REAL NOT NULL,
+  FOREIGN KEY (export_id) REFERENCES four_hour_exports(id) ON DELETE CASCADE
+);
+CREATE INDEX IF NOT EXISTS idx_fhe_items_export ON four_hour_export_items(export_id);
+CREATE INDEX IF NOT EXISTS idx_fhe_items_hour ON four_hour_export_items(hour_id);