arbiter-simple (postgresql-simple)

This backend uses postgresql-simple and resource-pool. Handlers receive a raw Connection. Nested transactions automatically use savepoints.

env <- ArbS.createSimpleEnv (Proxy @AppRegistry) connStr "arbiter"
ArbS.runSimpleDb env $ Arb.insertJob (Arb.defaultJob $ SendWelcome "alice@example.com" "Alice")

Share a transaction with external database work:

PG.withTransaction conn $ do
  PG.execute conn "INSERT INTO orders (id) VALUES (?)" (PG.Only orderId)
  ArbS.inTransaction @AppRegistry conn "arbiter" $
    Arb.insertJob (Arb.defaultJob (ProcessOrder orderId))

See the arbiter-simple haddocks for the env and pool constructors.