message: Fix close should null the loading promise as well
diff: @@ -15,7 +15,7 @@ export class PostgresDBService {
  private _db: DataSource
  private static _instance: PostgresDBService | null
  - private static _instanceLoading: Promise<PostgresDBService>
  + private static _instanceLoading: Promise<PostgresDBService> | null
  public static getInstance = async (opts?: DbOpts): Promise<PostgresDBService> => {
  if (PostgresDBService._instance) return PostgresDBService._instance
  @@ -44,6 +44,7 @@ export class PostgresDBService {
  public async close() {
  await this._db.destroy()
  PostgresDBService._instance = null
  + PostgresDBService._instanceLoading = null
  }
  public getConnection() {
  