Move old backend code to old_src folder

Signed-off-by: David Mehren <git@herrmehren.de>

old_src/lib/models/index.ts

@@ -0,0 +1,60 @@
+import { Sequelize } from 'sequelize-typescript'
+import { cloneDeep } from 'lodash'
+import * as path from 'path'
+import { Author } from './author'
+import { Note } from './note'
+import { Revision } from './revision'
+import { Temp } from './temp'
+import { User } from './user'
+import { logger } from '../logger'
+import { config } from '../config'
+import Umzug from 'umzug'
+import SequelizeTypes from 'sequelize'
+
+const dbconfig = cloneDeep(config.db)
+dbconfig.logging = config.debug ? (data): void => {
+  logger.info(data)
+} : false
+
+export let sequelize: Sequelize
+
+// Heroku specific
+if (config.dbURL) {
+  sequelize = new Sequelize(config.dbURL, dbconfig)
+} else {
+  sequelize = new Sequelize(dbconfig.database, dbconfig.username, dbconfig.password, dbconfig)
+}
+
+const umzug = new Umzug({
+  migrations: {
+    path: path.resolve(__dirname, '..', 'migrations'),
+    params: [
+      sequelize.getQueryInterface(),
+      SequelizeTypes
+    ]
+  },
+  // Required wrapper function required to prevent winstion issue
+  // https://github.com/winstonjs/winston/issues/1577
+  logging: (message): void => {
+    logger.info(message)
+  },
+  storage: 'sequelize',
+  storageOptions: {
+    sequelize: sequelize
+  }
+})
+
+export async function runMigrations (): Promise<void> {
+  // checks migrations and run them if they are not already applied
+  // exit in case of unsuccessful migrations
+  await umzug.up().catch(error => {
+    logger.error(error)
+    logger.error('Database migration failed. Exiting…')
+    process.exit(1)
+  })
+  logger.info('All migrations performed successfully')
+}
+
+sequelize.addModels([Author, Note, Revision, Temp, User])
+
+export { Author, Note, Revision, Temp, User }