feat: implement subscriber info retrieval

migrations/1628100660620-subscriber-info.js

@@ -0,0 +1,15 @@
+var db = require('./db')
+
+exports.up = function (next) {
+  var sql = [
+    `ALTER TABLE customers ADD COLUMN subscriber_info JSON`,
+    `ALTER TABLE customers ADD COLUMN subscriber_info_at TIMESTAMPTZ`,
+    `ALTER TABLE customers ADD COLUMN subscriber_info_by UUID REFERENCES users(id)`
+  ]
+
+  db.multi(sql, next)
+}
+
+exports.down = function (next) {
+  next()
+}