feat: cashbox batch table and update bills

migrations/1616528363530-add_cashbox_batches.js

@@ -0,0 +1,26 @@
+var db = require('./db')
+
+exports.up = function (next) {
+  var sqls = [
+    `create table cashbox_batches (
+      id serial PRIMARY KEY,
+      device_id text REFERENCES devices (device_id),
+      created timestamptz NOT NULL default now()
+    )`,
+
+    `ALTER TABLE bills ADD COLUMN legacy boolean DEFAULT false`,
+
+    `ALTER TABLE bills ADD COLUMN cashbox_batch_id int`,
+
+    `ALTER TABLE bills ADD CONSTRAINT cashbox_batch_id
+    FOREIGN KEY (cashbox_batch_id)
+    REFERENCES cashbox_batches (id)`,
+
+    `UPDATE bills SET legacy = 'true'`
+  ]
+  db.multi(sqls, next)
+}
+
+exports.down = function (next) {
+  next()
+}