text: const db = require('../lib/db')
  const logger = require('./logger')
  
  const upsert = 'insert into migrations (id, data) values (1, $1) on conflict (id) do update set data = $1'
  
  function DbMigrateStore () {
  }
  
  DbMigrateStore.prototype.save = function (set, fn) {
    let insertData = JSON.stringify({
      lastRun: set.lastRun,
      migrations: set.migrations
    })
    db.none(upsert, [insertData]).then(fn).catch(logger.error)
  }
  
  DbMigrateStore.prototype.load = function (fn) {
    db.one('select data from migrations').then(({ data }) => {
      fn(null, data)
    })
  }
  
  module.exports = DbMigrateStore
  