Feat: make compute schema middleware for 'db' changing

lib/compute-schema.js

@@ -0,0 +1,12 @@
+const { asyncLocalStorage } = require('./async-storage')
+
+const computeSchema = (req, res, next) => {
+  const store = new Map()
+  store.set('schema', 'public')
+  store.set('defaultSchema', 'ERROR_SCHEMA')
+  asyncLocalStorage.run(store, () => {
+    next()
+  })
+}
+
+module.exports = computeSchema