CREATE OR REPLACE FUNCTION create_table_refunds(
  IN shard_suffix VARCHAR DEFAULT NULL
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
DECLARE
  table_name VARCHAR DEFAULT 'refunds';
BEGIN
  PERFORM create_partitioned_table(
    'CREATE TABLE IF NOT EXISTS %I'
      '(refund_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY' -- UNIQUE'
      ',coin_pub BYTEA NOT NULL CHECK (LENGTH(coin_pub)=32)' -- REFERENCES known_coins (coin_pub) ON DELETE CASCADE
      ',deposit_serial_id INT8 NOT NULL' -- REFERENCES deposits (deposit_serial_id) ON DELETE CASCADE'
      ',merchant_sig BYTEA NOT NULL CHECK(LENGTH(merchant_sig)=64)'
      ',rtransaction_id INT8 NOT NULL'
      ',amount_with_fee_val INT8 NOT NULL'
      ',amount_with_fee_frac INT4 NOT NULL'
      -- ,PRIMARY KEY (deposit_serial_id, rtransaction_id) -- done per shard!
    ') %s ;'
    ,table_name
    ,'PARTITION BY HASH (coin_pub)'
    ,shard_suffix
  );

  table_name = concat_ws('_', table_name, shard_suffix);

  EXECUTE FORMAT (
    'CREATE INDEX IF NOT EXISTS ' || table_name || '_by_coin_pub_index '
    'ON ' || table_name || ' '
    '(coin_pub);'
  );

END
$$;

CREATE OR REPLACE FUNCTION constrain0002_table_refunds (
  IN partition_suffix VARCHAR DEFAULT NULL
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
  -- FIXME: '_' issue if partition_suffix is NULL
  -- => solve with general ALTER TABLE helper function!
    'ALTER TABLE refunds_' || partition_suffix || ' '
      'ADD CONSTRAINT refunds_' || partition_suffix || '_refund_serial_id_key '
        'UNIQUE (refund_serial_id) '
      ',ADD PRIMARY KEY (deposit_serial_id, rtransaction_id) '
  );
END
$$;


INSERT INTO exchange_tables
    (name
    ,version
    ,action
    ,partitioned
    ,by_range)
  VALUES
    ('refunds'
    ,'exchange-0002'
    ,'create'
    ,TRUE
    ,FALSE),
    ('refunds'
    ,'exchange-0002'
    ,'constrain0002'
    ,TRUE
    ,FALSE);