fix: machine unpair

feat: add removed_devices table

migrations/1637877732001-add_unpaired_devices_table.js

@@ -0,0 +1,22 @@
+var db = require('./db')
+
+exports.up = function (next) {
+  var sql = [
+    `ALTER TABLE cashbox_batches
+    DROP CONSTRAINT cashbox_batches_device_id_fkey;`,
+    `CREATE TABLE IF NOT EXISTS unpaired_devices (
+      id uuid PRIMARY KEY,
+      device_id text NOT NULL,
+      model text,
+      name text,
+      paired timestamp NOT NULL,
+      unpaired timestamp NOT NULL
+    )`,
+  ]
+
+  db.multi(sql, next)
+}
+
+exports.down = function (next) {
+  next()
+}