feat: add migration script

BREAKING CHANGE: Migration to grammY

migrate.ts

@@ -0,0 +1,56 @@
+import { MongoClient } from 'mongodb'
+export type Target = {
+  key: string
+  value: {
+    pixKey: string
+    city: string
+    name: string
+    query: string
+  }
+}
+
+export type Origin = {
+  telegramId: number
+  pixKey: string
+  city: string
+  name: string
+}
+
+function convert(origin: Origin): Target {
+  return {
+    key: origin.telegramId.toString(),
+    value: {
+      pixKey: origin.pixKey,
+      city: origin.city,
+      name: origin.name,
+      query: ''
+    }
+  }
+}
+
+const DB_URI = process.env.DB_URI ?? ''
+const PROD_DBNAME = 'amandapix'
+
+async function main() {
+  const client = new MongoClient(DB_URI)
+  await client.connect()
+  const db = client.db(PROD_DBNAME)
+  const users = db.collection<Origin>('users')
+  const sessions = db.collection<Target>('sessions')
+
+  const migrated = await users
+    .find({})
+    .toArray()
+    .then((users) => users.filter((user) => user.pixKey))
+    .then((users) => users.map(convert))
+
+  await sessions.insertMany(migrated)
+
+  await client.close()
+}
+
+main()
+  .then(() => {
+    console.log('Done')
+  })
+  .catch(console.error)