--
-- This file is part of TALER
-- Copyright (C) 2014--2022 Taler Systems SA
--
-- TALER is free software; you can redistribute it and/or modify it under the
-- terms of the GNU General Public License as published by the Free Software
-- Foundation; either version 3, or (at your option) any later version.
--
-- TALER is distributed in the hope that it will be useful, but WITHOUT ANY
-- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
-- A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License along with
-- TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
--

-- Everything in one big transaction
BEGIN;

-- Check patch versioning is in place.
SELECT _v.register_patch('exchange-0001', NULL, NULL);


CREATE TABLE IF NOT EXISTS denominations
  (denominations_serial BIGINT GENERATED BY DEFAULT AS IDENTITY UNIQUE
  ,denom_pub_hash BYTEA PRIMARY KEY CHECK (LENGTH(denom_pub_hash)=64)
  ,denom_type INT4 NOT NULL DEFAULT (1) -- 1 == RSA (for now, remove default later!)
  ,age_mask INT4 NOT NULL DEFAULT (0)
  ,denom_pub BYTEA NOT NULL
  ,master_sig BYTEA NOT NULL CHECK (LENGTH(master_sig)=64)
  ,valid_from INT8 NOT NULL
  ,expire_withdraw INT8 NOT NULL
  ,expire_deposit INT8 NOT NULL
  ,expire_legal INT8 NOT NULL
  ,coin_val INT8 NOT NULL
  ,coin_frac INT4 NOT NULL
  ,fee_withdraw_val INT8 NOT NULL
  ,fee_withdraw_frac INT4 NOT NULL
  ,fee_deposit_val INT8 NOT NULL
  ,fee_deposit_frac INT4 NOT NULL
  ,fee_refresh_val INT8 NOT NULL
  ,fee_refresh_frac INT4 NOT NULL
  ,fee_refund_val INT8 NOT NULL
  ,fee_refund_frac INT4 NOT NULL
  );
COMMENT ON TABLE denominations
  IS 'Main denominations table. All the valid denominations the exchange knows about.';
COMMENT ON COLUMN denominations.denom_type
  IS 'determines cipher type for blind signatures used with this denomination; 0 is for RSA';
COMMENT ON COLUMN denominations.age_mask
  IS 'bitmask with the age restrictions that are being used for this denomination; 0 if denomination does not support the use of age restrictions';
COMMENT ON COLUMN denominations.denominations_serial
  IS 'needed for exchange-auditor replication logic';

CREATE INDEX IF NOT EXISTS denominations_by_expire_legal_index
  ON denominations
  (expire_legal);


CREATE TABLE IF NOT EXISTS denomination_revocations
  (denom_revocations_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY UNIQUE
  ,denominations_serial INT8 PRIMARY KEY REFERENCES denominations (denominations_serial) ON DELETE CASCADE
  ,master_sig BYTEA NOT NULL CHECK (LENGTH(master_sig)=64)
  );
COMMENT ON TABLE denomination_revocations
  IS 'remembering which denomination keys have been revoked';


CREATE TABLE IF NOT EXISTS wire_targets
  (wire_target_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE
  ,wire_target_h_payto BYTEA PRIMARY KEY CHECK (LENGTH(wire_target_h_payto)=32)
  ,payto_uri VARCHAR NOT NULL
  ,kyc_ok BOOLEAN NOT NULL DEFAULT (FALSE)
  ,external_id VARCHAR
  )
  PARTITION BY HASH (wire_target_h_payto);
COMMENT ON TABLE wire_targets
  IS 'All senders and recipients of money via the exchange';
COMMENT ON COLUMN wire_targets.payto_uri
  IS 'Can be a regular bank account, or also be a URI identifying a reserve-account (for P2P payments)';
COMMENT ON COLUMN wire_targets.wire_target_h_payto
  IS 'Unsalted hash of payto_uri';
COMMENT ON COLUMN wire_targets.kyc_ok
  IS 'true if the KYC check was passed successfully';
COMMENT ON COLUMN wire_targets.external_id
  IS 'Name of the user that was used for OAuth 2.0-based legitimization';

CREATE TABLE IF NOT EXISTS wire_targets_default
  PARTITION OF wire_targets
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_wire_targets_partition(
  IN partition_suffix VARCHAR
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE wire_targets_' || partition_suffix || ' '
      'ADD CONSTRAINT wire_targets_' || partition_suffix || '_wire_target_serial_id_key '
        'UNIQUE (wire_target_serial_id)'
  );
END
$$;

SELECT add_constraints_to_wire_targets_partition('default');

-- FIXME partition by serial_id rather than h_payto,
-- it is used more in join conditions - crucial for sharding to select this.
-- Author: (Boss Marco)
CREATE INDEX IF NOT EXISTS wire_targets_serial_id_index
  ON wire_targets
  (wire_target_serial_id);


CREATE TABLE IF NOT EXISTS reserves
  (reserve_uuid BIGINT GENERATED BY DEFAULT AS IDENTITY
  ,reserve_pub BYTEA PRIMARY KEY CHECK(LENGTH(reserve_pub)=32)
  ,current_balance_val INT8 NOT NULL
  ,current_balance_frac INT4 NOT NULL
  ,expiration_date INT8 NOT NULL
  ,gc_date INT8 NOT NULL    
  )
  PARTITION BY HASH (reserve_pub);
COMMENT ON TABLE reserves
  IS 'Summarizes the balance of a reserve. Updated when new funds are added or withdrawn.';
COMMENT ON COLUMN reserves.reserve_pub
  IS 'EdDSA public key of the reserve. Knowledge of the private key implies ownership over the balance.';
COMMENT ON COLUMN reserves.current_balance_val
  IS 'Current balance remaining with the reserve';
COMMENT ON COLUMN reserves.expiration_date
  IS 'Used to trigger closing of reserves that have not been drained after some time';
COMMENT ON COLUMN reserves.gc_date
  IS 'Used to forget all information about a reserve during garbage collection';
CREATE TABLE IF NOT EXISTS reserves_default
  PARTITION OF reserves
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE INDEX IF NOT EXISTS reserves_by_expiration_index
  ON reserves
  (expiration_date
  ,current_balance_val
  ,current_balance_frac
  );
COMMENT ON INDEX reserves_by_expiration_index
  IS 'used in get_expired_reserves';
CREATE INDEX IF NOT EXISTS reserves_by_reserve_uuid_index
  ON reserves
  (reserve_uuid);
CREATE INDEX IF NOT EXISTS reserves_by_gc_date_index
  ON reserves
  (gc_date);
COMMENT ON INDEX reserves_by_gc_date_index
  IS 'for reserve garbage collection';


CREATE TABLE IF NOT EXISTS reserves_in
  (reserve_in_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE
  ,reserve_pub BYTEA PRIMARY KEY REFERENCES reserves (reserve_pub) ON DELETE CASCADE
  ,wire_reference INT8 NOT NULL
  ,credit_val INT8 NOT NULL
  ,credit_frac INT4 NOT NULL
  ,wire_source_h_payto BYTEA CHECK (LENGTH(wire_source_h_payto)=32)
  ,exchange_account_section TEXT NOT NULL
  ,execution_date INT8 NOT NULL
  )
  PARTITION BY HASH (reserve_pub);
COMMENT ON TABLE reserves_in
  IS 'list of transfers of funds into the reserves, one per incoming wire transfer';
COMMENT ON COLUMN reserves_in.wire_source_h_payto
  IS 'Identifies the debited bank account and KYC status';
COMMENT ON COLUMN reserves_in.reserve_pub
  IS 'Public key of the reserve. Private key signifies ownership of the remaining balance.';
COMMENT ON COLUMN reserves_in.credit_val
  IS 'Amount that was transferred into the reserve';

CREATE TABLE IF NOT EXISTS reserves_in_default
  PARTITION OF reserves_in
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_reserves_in_partition(
  IN partition_suffix VARCHAR
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE reserves_in_' || partition_suffix || ' '
      'ADD CONSTRAINT reserves_in_' || partition_suffix || '_reserve_in_serial_id_key '
        'UNIQUE (reserve_in_serial_id)'
  );
END
$$;

SELECT add_constraints_to_reserves_in_partition('default');

CREATE INDEX IF NOT EXISTS reserves_in_by_reserve_in_serial_id_index
  ON reserves_in
  (reserve_in_serial_id);
CREATE INDEX IF NOT EXISTS reserves_in_by_exchange_account_section_execution_date_index
  ON reserves_in
  (exchange_account_section
  ,execution_date
  );
CREATE INDEX IF NOT EXISTS reserves_in_by_exchange_account_reserve_in_serial_id_index
  ON reserves_in
  (exchange_account_section,
  reserve_in_serial_id DESC
  );


CREATE TABLE IF NOT EXISTS reserves_close
  (close_uuid BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE / PRIMARY KEY
  ,reserve_pub BYTEA NOT NULL REFERENCES reserves (reserve_pub) ON DELETE CASCADE
  ,execution_date INT8 NOT NULL
  ,wtid BYTEA NOT NULL CHECK (LENGTH(wtid)=32)
  ,wire_target_h_payto BYTEA CHECK (LENGTH(wire_target_h_payto)=32)
  ,amount_val INT8 NOT NULL
  ,amount_frac INT4 NOT NULL
  ,closing_fee_val INT8 NOT NULL
  ,closing_fee_frac INT4 NOT NULL)
  PARTITION BY HASH (reserve_pub);
COMMENT ON TABLE reserves_close
  IS 'wire transfers executed by the reserve to close reserves';
COMMENT ON COLUMN reserves_close.wire_target_h_payto
  IS 'Identifies the credited bank account (and KYC status). Note that closing does not depend on KYC.';

CREATE INDEX IF NOT EXISTS reserves_close_by_close_uuid_index
  ON reserves_close
  (close_uuid);
CREATE INDEX IF NOT EXISTS reserves_close_by_reserve_pub_index
  ON reserves_close
  (reserve_pub);

CREATE TABLE IF NOT EXISTS reserves_close_default
  PARTITION OF reserves_close
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_reserves_close_partition(
  IN partition_suffix VARCHAR
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE reserves_close_' || partition_suffix || ' '
      'ADD CONSTRAINT reserves_close_' || partition_suffix || '_close_uuid_pkey '
        'PRIMARY KEY (close_uuid)'
  );
END
$$;

SELECT add_constraints_to_reserves_close_partition('default');



CREATE TABLE IF NOT EXISTS reserves_out
  (reserve_out_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE
  ,h_blind_ev BYTEA CHECK (LENGTH(h_blind_ev)=64) UNIQUE
  ,denominations_serial INT8 NOT NULL REFERENCES denominations (denominations_serial)
  ,denom_sig BYTEA NOT NULL
  ,reserve_uuid INT8 NOT NULL -- REFERENCES reserves (reserve_uuid) ON DELETE CASCADE
  ,reserve_sig BYTEA NOT NULL CHECK (LENGTH(reserve_sig)=64)
  ,execution_date INT8 NOT NULL
  ,amount_with_fee_val INT8 NOT NULL
  ,amount_with_fee_frac INT4 NOT NULL
  )
  PARTITION BY HASH (h_blind_ev);
COMMENT ON TABLE reserves_out
  IS 'Withdraw operations performed on reserves.';
COMMENT ON COLUMN reserves_out.h_blind_ev
  IS 'Hash of the blinded coin, used as primary key here so that broken clients that use a non-random coin or blinding factor fail to withdraw (otherwise they would fail on deposit when the coin is not unique there).';
COMMENT ON COLUMN reserves_out.denominations_serial
  IS 'We do not CASCADE ON DELETE here, we may keep the denomination data alive';

CREATE INDEX IF NOT EXISTS reserves_out_by_reserve_out_serial_id_index
  ON reserves_out
  (reserve_out_serial_id);
CREATE INDEX IF NOT EXISTS reserves_out_by_reserve_uuid_and_execution_date_index
  ON reserves_out
  (reserve_uuid, execution_date);
COMMENT ON INDEX reserves_out_by_reserve_uuid_and_execution_date_index
  IS 'for get_reserves_out and exchange_do_withdraw_limit_check';



CREATE TABLE IF NOT EXISTS reserves_out_default
  PARTITION OF reserves_out
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_reserves_out_partition(
  IN partition_suffix VARCHAR
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE reserves_out_' || partition_suffix || ' '
      'ADD CONSTRAINT reserves_out_' || partition_suffix || '_reserve_out_serial_id_key '
        'UNIQUE (reserve_out_serial_id)'
  );
END
$$;

SELECT add_constraints_to_reserves_out_partition('default');


CREATE TABLE IF NOT EXISTS auditors
  (auditor_uuid BIGINT GENERATED BY DEFAULT AS IDENTITY UNIQUE
  ,auditor_pub BYTEA PRIMARY KEY CHECK (LENGTH(auditor_pub)=32)
  ,auditor_name VARCHAR NOT NULL
  ,auditor_url VARCHAR NOT NULL
  ,is_active BOOLEAN NOT NULL
  ,last_change INT8 NOT NULL
  );
COMMENT ON TABLE auditors
  IS 'Table with auditors the exchange uses or has used in the past. Entries never expire as we need to remember the last_change column indefinitely.';
COMMENT ON COLUMN auditors.auditor_pub
  IS 'Public key of the auditor.';
COMMENT ON COLUMN auditors.auditor_url
  IS 'The base URL of the auditor.';
COMMENT ON COLUMN auditors.is_active
  IS 'true if we are currently supporting the use of this auditor.';
COMMENT ON COLUMN auditors.last_change
  IS 'Latest time when active status changed. Used to detect replays of old messages.';


CREATE TABLE IF NOT EXISTS auditor_denom_sigs
  (auditor_denom_serial BIGINT GENERATED BY DEFAULT AS IDENTITY UNIQUE
  ,auditor_uuid INT8 NOT NULL REFERENCES auditors (auditor_uuid) ON DELETE CASCADE
  ,denominations_serial INT8 NOT NULL REFERENCES denominations (denominations_serial) ON DELETE CASCADE
  ,auditor_sig BYTEA CHECK (LENGTH(auditor_sig)=64)
  ,PRIMARY KEY (denominations_serial, auditor_uuid)
  );
COMMENT ON TABLE auditor_denom_sigs
  IS 'Table with auditor signatures on exchange denomination keys.';
COMMENT ON COLUMN auditor_denom_sigs.auditor_uuid
  IS 'Identifies the auditor.';
COMMENT ON COLUMN auditor_denom_sigs.denominations_serial
  IS 'Denomination the signature is for.';
COMMENT ON COLUMN auditor_denom_sigs.auditor_sig
  IS 'Signature of the auditor, of purpose TALER_SIGNATURE_AUDITOR_EXCHANGE_KEYS.';


CREATE TABLE IF NOT EXISTS exchange_sign_keys
  (esk_serial BIGINT GENERATED BY DEFAULT AS IDENTITY UNIQUE
  ,exchange_pub BYTEA PRIMARY KEY CHECK (LENGTH(exchange_pub)=32)
  ,master_sig BYTEA NOT NULL CHECK (LENGTH(master_sig)=64)
  ,valid_from INT8 NOT NULL
  ,expire_sign INT8 NOT NULL
  ,expire_legal INT8 NOT NULL
  );
COMMENT ON TABLE exchange_sign_keys
  IS 'Table with master public key signatures on exchange online signing keys.';
COMMENT ON COLUMN exchange_sign_keys.exchange_pub
  IS 'Public online signing key of the exchange.';
COMMENT ON COLUMN exchange_sign_keys.master_sig
  IS 'Signature affirming the validity of the signing key of purpose TALER_SIGNATURE_MASTER_SIGNING_KEY_VALIDITY.';
COMMENT ON COLUMN exchange_sign_keys.valid_from
  IS 'Time when this online signing key will first be used to sign messages.';
COMMENT ON COLUMN exchange_sign_keys.expire_sign
  IS 'Time when this online signing key will no longer be used to sign.';
COMMENT ON COLUMN exchange_sign_keys.expire_legal
  IS 'Time when this online signing key legally expires.';


CREATE TABLE IF NOT EXISTS signkey_revocations
  (signkey_revocations_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY UNIQUE
  ,esk_serial INT8 PRIMARY KEY REFERENCES exchange_sign_keys (esk_serial) ON DELETE CASCADE
  ,master_sig BYTEA NOT NULL CHECK (LENGTH(master_sig)=64)
  );
COMMENT ON TABLE signkey_revocations
  IS 'Table storing which online signing keys have been revoked';


CREATE TABLE IF NOT EXISTS extensions
  (extension_id BIGINT GENERATED BY DEFAULT AS IDENTITY UNIQUE
  ,name VARCHAR NOT NULL UNIQUE
  ,config BYTEA
  );
COMMENT ON TABLE extensions
  IS 'Configurations of the activated extensions';
COMMENT ON COLUMN extensions.name
  IS 'Name of the extension';
COMMENT ON COLUMN extensions.config
  IS 'Configuration of the extension as JSON-blob, maybe NULL';


CREATE TABLE IF NOT EXISTS known_coins
  (known_coin_id BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE
  ,denominations_serial INT8 NOT NULL REFERENCES denominations (denominations_serial) ON DELETE CASCADE
  ,coin_pub BYTEA NOT NULL PRIMARY KEY CHECK (LENGTH(coin_pub)=32)
  ,age_commitment_hash BYTEA CHECK (LENGTH(age_commitment_hash)=32)
  ,denom_sig BYTEA NOT NULL
  ,remaining_val INT8 NOT NULL
  ,remaining_frac INT4 NOT NULL
  )
  PARTITION BY HASH (coin_pub); -- FIXME: or include denominations_serial? or multi-level partitioning?
COMMENT ON TABLE known_coins
  IS 'information about coins and their signatures, so we do not have to store the signatures more than once if a coin is involved in multiple operations';
COMMENT ON COLUMN known_coins.denominations_serial
  IS 'Denomination of the coin, determines the value of the original coin and applicable fees for coin-specific operations.';
COMMENT ON COLUMN known_coins.coin_pub
  IS 'EdDSA public key of the coin';
COMMENT ON COLUMN known_coins.remaining_val
  IS 'Value of the coin that remains to be spent';
COMMENT ON COLUMN known_coins.age_commitment_hash
  IS 'Optional hash of the age commitment for age restrictions as per DD 24 (active if denom_type has the respective bit set)';
COMMENT ON COLUMN known_coins.denom_sig
  IS 'This is the signature of the exchange that affirms that the coin is a valid coin. The specific signature type depends on denom_type of the denomination.';

CREATE TABLE IF NOT EXISTS known_coins_default
  PARTITION OF known_coins
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_known_coins_partition(
  IN partition_suffix VARCHAR
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE known_coins_' || partition_suffix || ' '
      'ADD CONSTRAINT known_coins_' || partition_suffix || 'k_nown_coin_id_key '
        'UNIQUE (known_coin_id)'
  );
END
$$;

SELECT add_constraints_to_known_coins_partition('default');

CREATE INDEX IF NOT EXISTS known_coins_by_known_coin_id_index
  ON known_coins
  (known_coin_id);


CREATE TABLE IF NOT EXISTS refresh_commitments
  (melt_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE
  ,rc BYTEA PRIMARY KEY CHECK (LENGTH(rc)=64)
  ,old_coin_pub BYTEA NOT NULL REFERENCES known_coins (coin_pub) ON DELETE CASCADE
  ,old_coin_sig BYTEA NOT NULL CHECK(LENGTH(old_coin_sig)=64)
  ,amount_with_fee_val INT8 NOT NULL
  ,amount_with_fee_frac INT4 NOT NULL
  ,noreveal_index INT4 NOT NULL
  )
  PARTITION BY HASH (rc);
COMMENT ON TABLE refresh_commitments
  IS 'Commitments made when melting coins and the gamma value chosen by the exchange.';
COMMENT ON COLUMN refresh_commitments.noreveal_index
  IS 'The gamma value chosen by the exchange in the cut-and-choose protocol';
COMMENT ON COLUMN refresh_commitments.rc
  IS 'Commitment made by the client, hash over the various client inputs in the cut-and-choose protocol';
COMMENT ON COLUMN refresh_commitments.old_coin_pub
  IS 'Coin being melted in the refresh process.';

CREATE TABLE IF NOT EXISTS refresh_commitments_default
  PARTITION OF refresh_commitments
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_refresh_commitments_partition(
  IN partition_suffix VARCHAR
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE refresh_commitments_' || partition_suffix || ' '
      'ADD CONSTRAINT refresh_commitments_' || partition_suffix || '_melt_serial_id_key '
        'UNIQUE (melt_serial_id)'
  );
END
$$;

SELECT add_constraints_to_refresh_commitments_partition('default');

CREATE INDEX IF NOT EXISTS refresh_commitments_by_melt_serial_id_index
  ON refresh_commitments
  (melt_serial_id);
CREATE INDEX IF NOT EXISTS refresh_commitments_by_old_coin_pub_index
  ON refresh_commitments
  (old_coin_pub);


CREATE TABLE IF NOT EXISTS refresh_revealed_coins
  (rrc_serial BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE
  ,melt_serial_id INT8 NOT NULL -- REFERENCES refresh_commitments (melt_serial_id) ON DELETE CASCADE
  ,freshcoin_index INT4 NOT NULL
  ,link_sig BYTEA NOT NULL CHECK(LENGTH(link_sig)=64)
  ,denominations_serial INT8 NOT NULL REFERENCES denominations (denominations_serial) ON DELETE CASCADE
  ,coin_ev BYTEA NOT NULL -- UNIQUE
  ,h_coin_ev BYTEA NOT NULL CHECK(LENGTH(h_coin_ev)=64) -- UNIQUE
  ,ev_sig BYTEA NOT NULL
  ,ewv BYTEA NOT NULL
  --  ,PRIMARY KEY (melt_serial_id, freshcoin_index) -- done per shard
  )
  PARTITION BY HASH (melt_serial_id);
COMMENT ON TABLE refresh_revealed_coins
  IS 'Revelations about the new coins that are to be created during a melting session.';
COMMENT ON COLUMN refresh_revealed_coins.rrc_serial
  IS 'needed for exchange-auditor replication logic';
COMMENT ON COLUMN refresh_revealed_coins.melt_serial_id
  IS 'Identifies the refresh commitment (rc) of the melt operation.';
COMMENT ON COLUMN refresh_revealed_coins.freshcoin_index
  IS 'index of the fresh coin being created (one melt operation may result in multiple fresh coins)';
COMMENT ON COLUMN refresh_revealed_coins.coin_ev
  IS 'envelope of the new coin to be signed';
COMMENT ON COLUMN refresh_revealed_coins.ewv
  IS 'exchange contributed values in the creation of the fresh coin (see /csr)';
COMMENT ON COLUMN refresh_revealed_coins.h_coin_ev
  IS 'hash of the envelope of the new coin to be signed (for lookups)';
COMMENT ON COLUMN refresh_revealed_coins.ev_sig
  IS 'exchange signature over the envelope';

CREATE INDEX IF NOT EXISTS refresh_revealed_coins_by_rrc_serial_index
  ON refresh_revealed_coins
  (rrc_serial);
CREATE INDEX IF NOT EXISTS refresh_revealed_coins_by_melt_serial_id_index
  ON refresh_revealed_coins
  (melt_serial_id);

CREATE TABLE IF NOT EXISTS refresh_revealed_coins_default
  PARTITION OF refresh_revealed_coins
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_refresh_revealed_coins_partition(
  IN partition_suffix VARCHAR
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE refresh_revealed_coins_' || partition_suffix || ' '
      'ADD CONSTRAINT refresh_revealed_coins_' || partition_suffix || '_rrc_serial_key '
        'UNIQUE (rrc_serial) '
      ',ADD CONSTRAINT refresh_revealed_coins_' || partition_suffix || '_coin_ev_key '
        'UNIQUE (coin_ev) '
      ',ADD CONSTRAINT refresh_revealed_coins_' || partition_suffix || '_h_coin_ev_key '
        'UNIQUE (h_coin_ev) '
      ',ADD PRIMARY KEY (melt_serial_id, freshcoin_index) '
  );
END
$$;

SELECT add_constraints_to_refresh_revealed_coins_partition('default');




CREATE TABLE IF NOT EXISTS refresh_transfer_keys
  (rtc_serial BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE
  ,melt_serial_id INT8 PRIMARY KEY -- REFERENCES refresh_commitments (melt_serial_id) ON DELETE CASCADE
  ,transfer_pub BYTEA NOT NULL CHECK(LENGTH(transfer_pub)=32)
  ,transfer_privs BYTEA NOT NULL
  )
  PARTITION BY HASH (melt_serial_id);
COMMENT ON TABLE refresh_transfer_keys
  IS 'Transfer keys of a refresh operation (the data revealed to the exchange).';
COMMENT ON COLUMN refresh_transfer_keys.rtc_serial
  IS 'needed for exchange-auditor replication logic';
COMMENT ON COLUMN refresh_transfer_keys.melt_serial_id
  IS 'Identifies the refresh commitment (rc) of the operation.';
COMMENT ON COLUMN refresh_transfer_keys.transfer_pub
  IS 'transfer public key for the gamma index';
COMMENT ON COLUMN refresh_transfer_keys.transfer_privs
  IS 'array of TALER_CNC_KAPPA - 1 transfer private keys that have been revealed, with the gamma entry being skipped';

CREATE TABLE IF NOT EXISTS refresh_transfer_keys_default
  PARTITION OF refresh_transfer_keys
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_refresh_transfer_keys_partition(
  IN partition_suffix VARCHAR
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE refresh_transfer_keys_' || partition_suffix || ' '
      'ADD CONSTRAINT refresh_transfer_keys_' || partition_suffix || '_rtc_serial_key '
        'UNIQUE (rtc_serial)'
  );
END
$$;

SELECT add_constraints_to_refresh_transfer_keys_partition('default');

CREATE INDEX IF NOT EXISTS refresh_transfer_keys_by_rtc_serial_index
  ON refresh_transfer_keys
  (rtc_serial);


CREATE TABLE IF NOT EXISTS extension_details
  (extension_details_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY
  ,extension_options VARCHAR);
COMMENT ON TABLE extension_details
  IS 'Extensions that were provided with deposits (not yet used).';
COMMENT ON COLUMN extension_details.extension_options
  IS 'JSON object with options set that the exchange needs to consider when executing a deposit. Supported details depend on the extensions supported by the exchange.';


CREATE TABLE IF NOT EXISTS deposits
  (deposit_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY -- PRIMARY KEY
  ,shard INT8 NOT NULL
  ,coin_pub BYTEA NOT NULL CHECK (LENGTH(coin_pub)=32) -- REFERENCES known_coins (coin_pub) ON DELETE CASCADE
  ,known_coin_id BIGINT NOT NULL -- REFERENCES known_coins (known_coin_id) ON DELETE CASCADE
  ,amount_with_fee_val INT8 NOT NULL
  ,amount_with_fee_frac INT4 NOT NULL
  ,wallet_timestamp INT8 NOT NULL
  ,exchange_timestamp INT8 NOT NULL
  ,refund_deadline INT8 NOT NULL
  ,wire_deadline INT8 NOT NULL
  ,merchant_pub BYTEA NOT NULL CHECK (LENGTH(merchant_pub)=32)
  ,h_contract_terms BYTEA NOT NULL CHECK (LENGTH(h_contract_terms)=64)
  ,coin_sig BYTEA NOT NULL CHECK (LENGTH(coin_sig)=64)
  ,wire_salt BYTEA NOT NULL CHECK (LENGTH(wire_salt)=16)
  ,wire_target_h_payto BYTEA CHECK (LENGTH(wire_target_h_payto)=32)
  ,tiny BOOLEAN NOT NULL DEFAULT FALSE
  ,done BOOLEAN NOT NULL DEFAULT FALSE
  ,extension_blocked BOOLEAN NOT NULL DEFAULT FALSE
  ,extension_details_serial_id INT8 REFERENCES extension_details (extension_details_serial_id) ON DELETE CASCADE
  ,UNIQUE (shard, coin_pub, merchant_pub, h_contract_terms)
  )
  PARTITION BY HASH (shard); -- FIXME: why not BY RANGE? RANGE would seem better for 'deposits_get_ready'!
-- FIXME:
-- new idea: partition deposits by coin_pub (remove deposits_by_coin)
-- define 'ready' == ! (tiny || done || blocked)
-- add new deposits_by_ready (on shard + wire_deadline), select by shard, then ready + deadline
--         -- use triggers to ONLY include 'ready' deposits (delete on update)!
--         -- use multi-level partitions: Hash(shard) + Range(wire_deadline/sec)
-- add new deposits_by_match (on shard + refund_deadline)
--         -- use triggers to ONLY include 'ready' deposits (delete on update)!
--         -- use multi-level partitions: Hash(shard) + Range(refund_deadline/sec)
-- => first we select per-merchant shard, basically stay on the same system as other ops for the same merchant
-- => second we select by deadline, use enough values so that _usually_ the aggregator
--    and the 'insert' process _can_ work on different shards!
-- => the latter could be achieved by dynamically (!) creating/deleting partitions:
--    create new partitions 'as needed', drop old ones once the aggregator has made
--    them empty; as 'new' deposits will always have deadlines in the future, this
--    would basically guarantee no conflict between aggregator and exchange service!
-- SEE also: https://www.cybertec-postgresql.com/en/automatic-partition-creation-in-postgresql/
-- (article is slightly wrong, as this works:)
--CREATE TABLE tab (
--  id bigint GENERATED ALWAYS AS IDENTITY,
--  ts timestamp NOT NULL,
--  data text
-- PARTITION BY LIST ((ts::date));
-- CREATE TABLE tab_def PARTITION OF tab DEFAULT;
-- BEGIN
-- CREATE TABLE tab_part2 (LIKE tab);
-- insert into tab_part2 (id,ts, data) values (5,'2022-03-21', 'foo');
-- alter table tab attach partition tab_part2 for values in ('2022-03-21');
-- commit;
-- Naturally, to ensure this is actually 100% conflict-free, we'd
-- need to create tables at the granularity of the wire/refund deadlines;
-- that is right now seconds (!). But I see no problem with changing the
-- aggregator to basically always run 1 minute behind and use minutes instead!


COMMENT ON TABLE deposits
  IS 'Deposits we have received and for which we need to make (aggregate) wire transfers (and manage refunds).';
COMMENT ON COLUMN deposits.shard
  IS 'Used for load sharding. Should be set based on merchant_pub. 64-bit value because we need an *unsigned* 32-bit value.';
COMMENT ON COLUMN deposits.known_coin_id
  IS 'Used for garbage collection';
COMMENT ON COLUMN deposits.wire_target_h_payto
  IS 'Identifies the target bank account and KYC status';
COMMENT ON COLUMN deposits.wire_salt
  IS 'Salt used when hashing the payto://-URI to get the h_wire';
COMMENT ON COLUMN deposits.done
  IS 'Set to TRUE once we have included this deposit in some aggregate wire transfer to the merchant';
COMMENT ON COLUMN deposits.extension_blocked
  IS 'True if the aggregation of the deposit is currently blocked by some extension mechanism. Used to filter out deposits that must not be processed by the canonical deposit logic.';
COMMENT ON COLUMN deposits.extension_details_serial_id
  IS 'References extensions table, NULL if extensions are not used';
COMMENT ON COLUMN deposits.tiny
  IS 'Set to TRUE if we decided that the amount is too small to ever trigger a wire transfer by itself (requires real aggregation)';

CREATE INDEX IF NOT EXISTS deposits_deposit_by_serial_id_index
  ON deposits
  (shard,deposit_serial_id);
CREATE INDEX IF NOT EXISTS deposits_for_get_ready_index
  ON deposits
  (shard ASC
  ,done
  ,extension_blocked
  ,tiny
  ,wire_deadline ASC
  );
COMMENT ON INDEX deposits_for_get_ready_index
  IS 'for deposits_get_ready';

CREATE INDEX IF NOT EXISTS deposits_for_iterate_matching_index
  ON deposits
  (shard
  ,merchant_pub
  ,wire_target_h_payto
  ,done
  ,extension_blocked
  ,refund_deadline ASC
  );
COMMENT ON INDEX deposits_for_iterate_matching_index
  IS 'for deposits_iterate_matching';


CREATE TABLE IF NOT EXISTS deposits_default
  PARTITION OF deposits
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_deposits_partition(
  IN partition_suffix VARCHAR
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE deposits_' || partition_suffix || ' '
      'ADD CONSTRAINT deposits_' || partition_suffix || '_deposit_serial_id_pkey '
        'PRIMARY KEY (deposit_serial_id)'
  );
END
$$;

SELECT add_constraints_to_deposits_partition('default');



CREATE TABLE IF NOT EXISTS deposits_by_coin
  (deposit_serial_id BIGINT
  ,shard INT8 NOT NULL
  ,coin_pub BYTEA NOT NULL CHECK (LENGTH(coin_pub)=32)
  )
  PARTITION BY HASH (coin_pub);
COMMENT ON TABLE deposits_by_coin
  IS 'Enables fast lookups of deposit by coin_pub, auto-populated via TRIGGER below';

CREATE INDEX IF NOT EXISTS deposits_by_coin_main_index
  ON deposits_by_coin
  (coin_pub);

CREATE TABLE IF NOT EXISTS deposits_by_coin_default
  PARTITION OF deposits_by_coin
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION deposits_by_coin_insert_trigger()
  RETURNS trigger
  LANGUAGE plpgsql
  AS $$
BEGIN
  INSERT INTO deposits_by_coin
    (deposit_serial_id
    ,shard
    ,coin_pub)
  VALUES
    (NEW.deposit_serial_id
    ,NEW.shard
    ,NEW.coin_pub);
  RETURN NEW;
END $$;  
COMMENT ON FUNCTION deposits_by_coin_insert_trigger()
  IS 'Replicate deposit inserts into deposits_by_coin table.';

CREATE TRIGGER deposits_on_insert
  AFTER INSERT
   ON deposits
   FOR EACH ROW EXECUTE FUNCTION deposits_by_coin_insert_trigger();

CREATE OR REPLACE FUNCTION deposits_by_coin_delete_trigger()
  RETURNS trigger
  LANGUAGE plpgsql
  AS $$
BEGIN
  DELETE FROM deposits_by_coin
   WHERE coin_pub = OLD.coin_pub
     AND shard = OLD.shard
     AND deposit_serial_id = OLD.deposit_serial_id;
  RETURN OLD;
END $$;  
COMMENT ON FUNCTION deposits_by_coin_delete_trigger()
  IS 'Replicate deposits deletions into deposits_by_coin table.';

CREATE TRIGGER deposit_on_delete
  AFTER DELETE
    ON deposits
   FOR EACH ROW EXECUTE FUNCTION deposits_by_coin_delete_trigger();



CREATE TABLE IF NOT EXISTS refunds
  (refund_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE
  ,shard INT8 NOT NULL -- REFERENCES deposits (shard) 
  ,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!
  )
  PARTITION BY HASH (shard);
COMMENT ON TABLE refunds
  IS 'Data on coins that were refunded. Technically, refunds always apply against specific deposit operations involving a coin. The combination of coin_pub, merchant_pub, h_contract_terms and rtransaction_id MUST be unique, and we usually select by coin_pub so that one goes first.';
COMMENT ON COLUMN refunds.deposit_serial_id
  IS 'Identifies ONLY the merchant_pub, h_contract_terms and coin_pub. Multiple deposits may match a refund, this only identifies one of them.';
COMMENT ON COLUMN refunds.rtransaction_id
  IS 'used by the merchant to make refunds unique in case the same coin for the same deposit gets a subsequent (higher) refund';

CREATE TABLE IF NOT EXISTS refunds_default
  PARTITION OF refunds
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_refunds_partition(
  IN partition_suffix VARCHAR
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE refunds_' || partition_suffix || ' '
      'ADD CONSTRAINT refunds_' || partition_suffix || '_refund_serial_id_key '
        'UNIQUE (refund_serial_id) '
      ',ADD PRIMARY KEY (deposit_serial_id, rtransaction_id) '
  );
END
$$;

SELECT add_constraints_to_refunds_partition('default');

CREATE INDEX IF NOT EXISTS refunds_by_refund_serial_id_index
  ON refunds
  (refund_serial_id);
CREATE INDEX IF NOT EXISTS refunds_by_deposit_serial_id_index
  ON refunds
  (shard,deposit_serial_id);



CREATE TABLE IF NOT EXISTS wire_out
  (wireout_uuid BIGINT GENERATED BY DEFAULT AS IDENTITY -- PRIMARY KEY
  ,execution_date INT8 NOT NULL
  ,wtid_raw BYTEA UNIQUE NOT NULL CHECK (LENGTH(wtid_raw)=32)
  ,wire_target_h_payto BYTEA CHECK (LENGTH(wire_target_h_payto)=32)
  ,exchange_account_section TEXT NOT NULL
  ,amount_val INT8 NOT NULL
  ,amount_frac INT4 NOT NULL
  )
  PARTITION BY HASH (wtid_raw);
COMMENT ON TABLE wire_out
  IS 'wire transfers the exchange has executed';
COMMENT ON COLUMN wire_out.exchange_account_section
  IS 'identifies the configuration section with the debit account of this payment';
COMMENT ON COLUMN wire_out.wire_target_h_payto
  IS 'Identifies the credited bank account and KYC status';

CREATE INDEX IF NOT EXISTS wire_out_by_wireout_uuid_index
  ON wire_out
  (wireout_uuid);
CREATE INDEX IF NOT EXISTS wire_out_by_wire_target_h_payto_index
  ON wire_out
  (wire_target_h_payto);


CREATE TABLE IF NOT EXISTS wire_out_default
  PARTITION OF wire_out
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_wire_out_partition(
  IN partition_suffix VARCHAR
)
RETURNS void
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE wire_out_' || partition_suffix || ' '
      'ADD CONSTRAINT wire_out_' || partition_suffix || '_wireout_uuid_pkey '
        'PRIMARY KEY (wireout_uuid)'
  );
END
$$;

SELECT add_constraints_to_wire_out_partition('default');



CREATE TABLE IF NOT EXISTS aggregation_tracking
  (aggregation_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE
  ,deposit_serial_id INT8 PRIMARY KEY -- REFERENCES deposits (deposit_serial_id) ON DELETE CASCADE -- FIXME: change to coin_pub + deposit_serial_id for more efficient deposit -- or something else??? 
  ,wtid_raw BYTEA NOT NULL CONSTRAINT wire_out_ref REFERENCES wire_out(wtid_raw) ON DELETE CASCADE DEFERRABLE
  )
  PARTITION BY HASH (deposit_serial_id);
COMMENT ON TABLE aggregation_tracking
  IS 'mapping from wire transfer identifiers (WTID) to deposits (and back)';
COMMENT ON COLUMN aggregation_tracking.wtid_raw
  IS 'We first create entries in the aggregation_tracking table and then finally the wire_out entry once we know the total amount. Hence the constraint must be deferrable and we cannot use a wireout_uuid here, because we do not have it when these rows are created. Changing the logic to first INSERT a dummy row into wire_out and then UPDATEing that row in the same transaction would theoretically reduce per-deposit storage costs by 5 percent (24/~460 bytes).';

CREATE TABLE IF NOT EXISTS aggregation_tracking_default
  PARTITION OF aggregation_tracking
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_aggregation_tracking_partition(
  IN partition_suffix VARCHAR
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE aggregation_tracking_' || partition_suffix || ' '
      'ADD CONSTRAINT aggregation_tracking_' || partition_suffix || '_aggregation_serial_id_key '
        'UNIQUE (aggregation_serial_id) '
  );
END
$$;

SELECT add_constraints_to_aggregation_tracking_partition('default');

CREATE INDEX IF NOT EXISTS aggregation_tracking_by_aggregation_serial_id_index
  ON aggregation_tracking
  (aggregation_serial_id);
CREATE INDEX IF NOT EXISTS aggregation_tracking_by_wtid_raw_index
  ON aggregation_tracking
  (wtid_raw);
COMMENT ON INDEX aggregation_tracking_by_wtid_raw_index
  IS 'for lookup_transactions';


CREATE TABLE IF NOT EXISTS wire_fee
  (wire_fee_serial BIGINT GENERATED BY DEFAULT AS IDENTITY UNIQUE
  ,wire_method VARCHAR NOT NULL
  ,start_date INT8 NOT NULL
  ,end_date INT8 NOT NULL
  ,wire_fee_val INT8 NOT NULL
  ,wire_fee_frac INT4 NOT NULL
  ,closing_fee_val INT8 NOT NULL
  ,closing_fee_frac INT4 NOT NULL
  ,wad_fee_val INT8 NOT NULL
  ,wad_fee_frac INT4 NOT NULL
  ,master_sig BYTEA NOT NULL CHECK (LENGTH(master_sig)=64)
  ,PRIMARY KEY (wire_method, start_date)
  );
COMMENT ON TABLE wire_fee
  IS 'list of the wire fees of this exchange, by date';
COMMENT ON COLUMN wire_fee.wire_fee_serial
  IS 'needed for exchange-auditor replication logic';

CREATE INDEX IF NOT EXISTS wire_fee_by_end_date_index
  ON wire_fee
  (end_date);


CREATE TABLE IF NOT EXISTS global_fee
  (global_fee_serial BIGINT GENERATED BY DEFAULT AS IDENTITY UNIQUE
  ,start_date INT8 NOT NULL
  ,end_date INT8 NOT NULL
  ,history_fee_val INT8 NOT NULL
  ,history_fee_frac INT4 NOT NULL
  ,kyc_fee_val INT8 NOT NULL
  ,kyc_fee_frac INT4 NOT NULL
  ,account_fee_val INT8 NOT NULL
  ,account_fee_frac INT4 NOT NULL
  ,purse_fee_val INT8 NOT NULL
  ,purse_fee_frac INT4 NOT NULL
  ,purse_timeout INT8 NOT NULL
  ,kyc_timeout INT8 NOT NULL
  ,history_expiration INT8 NOT NULL
  ,purse_account_limit INT4 NOT NULL
  ,master_sig BYTEA NOT NULL CHECK (LENGTH(master_sig)=64)
  ,PRIMARY KEY (start_date)
  );
COMMENT ON TABLE global_fee
  IS 'list of the global fees of this exchange, by date';
COMMENT ON COLUMN global_fee.global_fee_serial
  IS 'needed for exchange-auditor replication logic';

CREATE INDEX IF NOT EXISTS global_fee_by_end_date_index
  ON global_fee
  (end_date);


CREATE TABLE IF NOT EXISTS recoup
  (recoup_uuid BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE
  ,coin_pub BYTEA NOT NULL CHECK (LENGTH(coin_pub)=32) -- REFERENCES known_coins (coin_pub)
  ,coin_sig BYTEA NOT NULL CHECK(LENGTH(coin_sig)=64)
  ,coin_blind BYTEA NOT NULL CHECK(LENGTH(coin_blind)=32)
  ,amount_val INT8 NOT NULL
  ,amount_frac INT4 NOT NULL
  ,recoup_timestamp INT8 NOT NULL
  ,reserve_out_serial_id INT8 NOT NULL -- REFERENCES reserves_out (reserve_out_serial_id) ON DELETE CASCADE
  )
  PARTITION BY HASH (coin_pub);
COMMENT ON TABLE recoup
  IS 'Information about recoups that were executed between a coin and a reserve. In this type of recoup, the amount is credited back to the reserve from which the coin originated.';
COMMENT ON COLUMN recoup.coin_pub
  IS 'Coin that is being debited in the recoup. Do not CASCADE ON DROP on the coin_pub, as we may keep the coin alive!';
COMMENT ON COLUMN recoup.reserve_out_serial_id
  IS 'Identifies the h_blind_ev of the recouped coin and provides the link to the credited reserve.';
COMMENT ON COLUMN recoup.coin_sig
  IS 'Signature by the coin affirming the recoup, of type TALER_SIGNATURE_WALLET_COIN_RECOUP';
COMMENT ON COLUMN recoup.coin_blind
  IS 'Denomination blinding key used when creating the blinded coin from the planchet. Secret revealed during the recoup to provide the linkage between the coin and the withdraw operation.';

CREATE INDEX IF NOT EXISTS recoup_by_recoup_uuid_index
  ON recoup
  (recoup_uuid);
CREATE INDEX IF NOT EXISTS recoup_by_reserve_out_serial_id_index
  ON recoup
  (reserve_out_serial_id);
CREATE INDEX IF NOT EXISTS recoup_by_coin_pub_index
  ON recoup
  (coin_pub);


CREATE TABLE IF NOT EXISTS recoup_default
  PARTITION OF recoup
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_recoup_partition(
  IN partition_suffix VARCHAR
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE recoup_' || partition_suffix || ' '
      'ADD CONSTRAINT recoup_' || partition_suffix || '_recoup_uuid_key '
        'UNIQUE (recoup_uuid) '
  );
END
$$;

SELECT add_constraints_to_recoup_partition('default');


CREATE TABLE IF NOT EXISTS recoup_by_reserve
  (reserve_out_serial_id INT8 NOT NULL -- REFERENCES reserves (reserve_out_serial_id) ON DELETE CASCADE
  ,coin_pub BYTEA CHECK (LENGTH(coin_pub)=32) 
  )
  PARTITION BY HASH (reserve_out_serial_id);
COMMENT ON TABLE recoup_by_reserve
  IS 'Information in this table is strictly redundant with that of recoup, but saved by a different primary key for fast lookups by reserve_out_serial_id.';

CREATE INDEX IF NOT EXISTS recoup_by_reserve_main_index
  ON recoup_by_reserve
  (reserve_out_serial_id);

CREATE TABLE IF NOT EXISTS recoup_by_reserve_default
  PARTITION OF recoup_by_reserve
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION recoup_insert_trigger()
  RETURNS trigger
  LANGUAGE plpgsql
  AS $$
BEGIN
  INSERT INTO recoup_by_reserve
    (reserve_out_serial_id
    ,coin_pub)
  VALUES
    (NEW.reserve_out_serial_id
    ,NEW.coin_pub);
  RETURN NEW;
END $$;  
COMMENT ON FUNCTION recoup_insert_trigger()
  IS 'Replicate recoup inserts into recoup_by_reserve table.';

CREATE TRIGGER recoup_on_insert
  AFTER INSERT
   ON recoup
   FOR EACH ROW EXECUTE FUNCTION recoup_insert_trigger();


CREATE OR REPLACE FUNCTION recoup_delete_trigger()
  RETURNS trigger
  LANGUAGE plpgsql
  AS $$
BEGIN
  DELETE FROM recoup_by_reserve
   WHERE reserve_out_serial_id = OLD.reserve_out_serial_id
     AND coin_pub = OLD.coin_pub;
  RETURN OLD;
END $$;  
COMMENT ON FUNCTION recoup_delete_trigger()
  IS 'Replicate recoup deletions into recoup_by_reserve table.';

CREATE TRIGGER recoup_on_delete
  AFTER DELETE
    ON recoup
   FOR EACH ROW EXECUTE FUNCTION recoup_delete_trigger();





CREATE TABLE IF NOT EXISTS reserves_out_by_reserve
  (reserve_uuid INT8 NOT NULL -- REFERENCES reserves (reserve_uuid) ON DELETE CASCADE
  ,h_blind_ev BYTEA CHECK (LENGTH(h_blind_ev)=64) 
  )
  PARTITION BY HASH (reserve_uuid);
COMMENT ON TABLE reserves_out_by_reserve
  IS 'Information in this table is strictly redundant with that of reserves_out, but saved by a different primary key for fast lookups by reserve public key/uuid.';

CREATE INDEX IF NOT EXISTS reserves_out_by_reserve_main_index
  ON reserves_out_by_reserve
  (reserve_uuid);


CREATE TABLE IF NOT EXISTS reserves_out_by_reserve_default
  PARTITION OF reserves_out_by_reserve
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION reserves_out_by_reserve_insert_trigger()
  RETURNS trigger
  LANGUAGE plpgsql
  AS $$
BEGIN
  INSERT INTO reserves_out_by_reserve
    (reserve_uuid
    ,h_blind_ev)
  VALUES
    (NEW.reserve_uuid
    ,NEW.h_blind_ev);
  RETURN NEW;
END $$;  
COMMENT ON FUNCTION reserves_out_by_reserve_insert_trigger()
  IS 'Replicate reserve_out inserts into reserve_out_by_reserve table.';

CREATE TRIGGER reserves_out_on_insert
  AFTER INSERT
   ON reserves_out
   FOR EACH ROW EXECUTE FUNCTION reserves_out_by_reserve_insert_trigger();


CREATE OR REPLACE FUNCTION reserves_out_by_reserve_delete_trigger()
  RETURNS trigger
  LANGUAGE plpgsql
  AS $$
BEGIN
  DELETE FROM reserves_out_by_reserve
   WHERE reserve_uuid = OLD.reserve_uuid;
  RETURN OLD;
END $$;  
COMMENT ON FUNCTION reserves_out_by_reserve_delete_trigger()
  IS 'Replicate reserve_out deletions into reserve_out_by_reserve table.';

CREATE TRIGGER reserves_out_on_delete
  AFTER DELETE
    ON reserves_out
   FOR EACH ROW EXECUTE FUNCTION reserves_out_by_reserve_delete_trigger();





CREATE TABLE IF NOT EXISTS recoup_refresh
  (recoup_refresh_uuid BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE
  ,coin_pub BYTEA NOT NULL CHECK (LENGTH(coin_pub)=32) -- REFERENCES known_coins (coin_pub)
  ,known_coin_id BIGINT NOT NULL -- REFERENCES known_coins (known_coin_id) ON DELETE CASCADE
  ,coin_sig BYTEA NOT NULL CHECK(LENGTH(coin_sig)=64)
  ,coin_blind BYTEA NOT NULL CHECK(LENGTH(coin_blind)=32)
  ,amount_val INT8 NOT NULL
  ,amount_frac INT4 NOT NULL
  ,recoup_timestamp INT8 NOT NULL
  ,rrc_serial INT8 NOT NULL -- REFERENCES refresh_revealed_coins (rrc_serial) ON DELETE CASCADE -- UNIQUE
  )
  PARTITION BY HASH (coin_pub);
COMMENT ON TABLE recoup_refresh
  IS 'Table of coins that originated from a refresh operation and that were recouped. Links the (fresh) coin to the melted operation (and thus the old coin). A recoup on a refreshed coin credits the old coin and debits the fresh coin.';
COMMENT ON COLUMN recoup_refresh.coin_pub
  IS 'Refreshed coin of a revoked denomination where the residual value is credited to the old coin. Do not CASCADE ON DROP on the coin_pub, as we may keep the coin alive!';
COMMENT ON COLUMN recoup_refresh.known_coin_id
  IS 'FIXME: (To be) used for garbage collection (in the future)';
COMMENT ON COLUMN recoup_refresh.rrc_serial
  IS 'Link to the refresh operation. Also identifies the h_blind_ev of the recouped coin (as h_coin_ev).';
COMMENT ON COLUMN recoup_refresh.coin_blind
  IS 'Denomination blinding key used when creating the blinded coin from the planchet. Secret revealed during the recoup to provide the linkage between the coin and the refresh operation.';

CREATE INDEX IF NOT EXISTS recoup_refresh_by_recoup_refresh_uuid_index
  ON recoup_refresh
  (recoup_refresh_uuid);
CREATE INDEX IF NOT EXISTS recoup_refresh_by_rrc_serial_index
  ON recoup_refresh
  (rrc_serial);
CREATE INDEX IF NOT EXISTS recoup_refresh_by_coin_pub_index
  ON recoup_refresh
  (coin_pub);


CREATE TABLE IF NOT EXISTS recoup_refresh_default
  PARTITION OF recoup_refresh
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_recoup_refresh_partition(
  IN partition_suffix VARCHAR
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE recoup_refresh_' || partition_suffix || ' '
      'ADD CONSTRAINT recoup_refresh_' || partition_suffix || '_recoup_refresh_uuid_key '
        'UNIQUE (recoup_refresh_uuid) '
  );
END
$$;

SELECT add_constraints_to_recoup_refresh_partition('default');



CREATE TABLE IF NOT EXISTS prewire
  (prewire_uuid BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY
  ,wire_method TEXT NOT NULL
  ,finished BOOLEAN NOT NULL DEFAULT false
  ,failed BOOLEAN NOT NULL DEFAULT false
  ,buf BYTEA NOT NULL
  )
  PARTITION BY HASH (prewire_uuid);
COMMENT ON TABLE prewire
  IS 'pre-commit data for wire transfers we are about to execute';
COMMENT ON COLUMN prewire.failed
  IS 'set to TRUE if the bank responded with a non-transient failure to our transfer request';
COMMENT ON COLUMN prewire.finished
  IS 'set to TRUE once bank confirmed receiving the wire transfer request';
COMMENT ON COLUMN prewire.buf
  IS 'serialized data to send to the bank to execute the wire transfer';

CREATE INDEX IF NOT EXISTS prewire_by_finished_index
  ON prewire
  (finished);
COMMENT ON INDEX prewire_by_finished_index
  IS 'for gc_prewire';
-- FIXME: find a way to combine these two indices?
CREATE INDEX IF NOT EXISTS prewire_by_failed_finished_index
  ON prewire
  (failed,finished);
COMMENT ON INDEX prewire_by_failed_finished_index
  IS 'for wire_prepare_data_get';

CREATE TABLE IF NOT EXISTS prewire_default
  PARTITION OF prewire
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);



CREATE TABLE IF NOT EXISTS wire_accounts
  (payto_uri VARCHAR PRIMARY KEY
  ,master_sig BYTEA CHECK (LENGTH(master_sig)=64)
  ,is_active BOOLEAN NOT NULL
  ,last_change INT8 NOT NULL
  );
COMMENT ON TABLE wire_accounts
  IS 'Table with current and historic bank accounts of the exchange. Entries never expire as we need to remember the last_change column indefinitely.';
COMMENT ON COLUMN wire_accounts.payto_uri
  IS 'payto URI (RFC 8905) with the bank account of the exchange.';
COMMENT ON COLUMN wire_accounts.master_sig
  IS 'Signature of purpose TALER_SIGNATURE_MASTER_WIRE_DETAILS';
COMMENT ON COLUMN wire_accounts.is_active
  IS 'true if we are currently supporting the use of this account.';
COMMENT ON COLUMN wire_accounts.last_change
  IS 'Latest time when active status changed. Used to detect replays of old messages.';
-- "wire_accounts" has no sequence because it is a 'mutable' table
--            and is of no concern to the auditor


CREATE TABLE IF NOT EXISTS cs_nonce_locks
  (cs_nonce_lock_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY -- UNIQUE
  ,nonce BYTEA PRIMARY KEY CHECK (LENGTH(nonce)=32)
  ,op_hash BYTEA NOT NULL CHECK (LENGTH(op_hash)=64)
  ,max_denomination_serial INT8 NOT NULL
  )
  PARTITION BY HASH (nonce);
COMMENT ON TABLE cs_nonce_locks
  IS 'ensures a Clause Schnorr client nonce is locked for use with an operation identified by a hash';
COMMENT ON COLUMN cs_nonce_locks.nonce
  IS 'actual nonce submitted by the client';
COMMENT ON COLUMN cs_nonce_locks.op_hash
  IS 'hash (RC for refresh, blind coin hash for withdraw) the nonce may be used with';
COMMENT ON COLUMN cs_nonce_locks.max_denomination_serial
  IS 'Maximum number of a CS denomination serial the nonce could be used with, for GC';

CREATE TABLE IF NOT EXISTS cs_nonce_locks_default
  PARTITION OF cs_nonce_locks
  FOR VALUES WITH (MODULUS 1, REMAINDER 0);

CREATE OR REPLACE FUNCTION add_constraints_to_cs_nonce_locks_partition(
  IN partition_suffix VARCHAR
)
RETURNS VOID
LANGUAGE plpgsql
AS $$
BEGIN
  EXECUTE FORMAT (
    'ALTER TABLE cs_nonce_locks_' || partition_suffix || ' '
      'ADD CONSTRAINT cs_nonce_locks_' || partition_suffix || '_cs_nonce_lock_serial_id_key '
        'UNIQUE (cs_nonce_lock_serial_id)'
  );
END
$$;

SELECT add_constraints_to_cs_nonce_locks_partition('default');

CREATE TABLE IF NOT EXISTS work_shards
  (shard_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY UNIQUE
  ,last_attempt INT8 NOT NULL
  ,start_row INT8 NOT NULL
  ,end_row INT8 NOT NULL
  ,completed BOOLEAN NOT NULL DEFAULT FALSE
  ,job_name VARCHAR NOT NULL
  ,PRIMARY KEY (job_name, start_row)
  );
COMMENT ON TABLE work_shards
  IS 'coordinates work between multiple processes working on the same job';
COMMENT ON COLUMN work_shards.shard_serial_id
  IS 'unique serial number identifying the shard';
COMMENT ON COLUMN work_shards.last_attempt
  IS 'last time a worker attempted to work on the shard';
COMMENT ON COLUMN work_shards.completed
  IS 'set to TRUE once the shard is finished by a worker';
COMMENT ON COLUMN work_shards.start_row
  IS 'row at which the shard scope starts, inclusive';
COMMENT ON COLUMN work_shards.end_row
  IS 'row at which the shard scope ends, exclusive';
COMMENT ON COLUMN work_shards.job_name
  IS 'unique name of the job the workers on this shard are performing';

CREATE INDEX IF NOT EXISTS work_shards_by_job_name_completed_last_attempt_index
  ON work_shards
  (job_name
  ,completed
  ,last_attempt
  );


CREATE UNLOGGED TABLE IF NOT EXISTS revolving_work_shards
  (shard_serial_id BIGINT GENERATED BY DEFAULT AS IDENTITY UNIQUE
  ,last_attempt INT8 NOT NULL
  ,start_row INT4 NOT NULL
  ,end_row INT4 NOT NULL
  ,active BOOLEAN NOT NULL DEFAULT FALSE
  ,job_name VARCHAR NOT NULL
  ,PRIMARY KEY (job_name, start_row)
  );
COMMENT ON TABLE revolving_work_shards
  IS 'coordinates work between multiple processes working on the same job with partitions that need to be repeatedly processed; unlogged because on system crashes the locks represented by this table will have to be cleared anyway, typically using "taler-exchange-dbinit -s"';
COMMENT ON COLUMN revolving_work_shards.shard_serial_id
  IS 'unique serial number identifying the shard';
COMMENT ON COLUMN revolving_work_shards.last_attempt
  IS 'last time a worker attempted to work on the shard';
COMMENT ON COLUMN revolving_work_shards.active
  IS 'set to TRUE when a worker is active on the shard';
COMMENT ON COLUMN revolving_work_shards.start_row
  IS 'row at which the shard scope starts, inclusive';
COMMENT ON COLUMN revolving_work_shards.end_row
  IS 'row at which the shard scope ends, exclusive';
COMMENT ON COLUMN revolving_work_shards.job_name
  IS 'unique name of the job the workers on this shard are performing';

CREATE INDEX IF NOT EXISTS revolving_work_shards_by_job_name_active_last_attempt_index
  ON revolving_work_shards
  (job_name
  ,active
  ,last_attempt
  );

-- Tables for P2P payments

CREATE TABLE IF NOT EXISTS partners
  (partner_serial_id BIGSERIAL UNIQUE
  ,partner_master_pub BYTEA NOT NULL CHECK(LENGTH(partner_master_pub)=32)
  ,start_date INT8 NOT NULL
  ,end_date INT8 NOT NULL
  ,wad_frequency INT8 NOT NULL
  ,wad_fee_val INT8 NOT NULL
  ,wad_fee_frac INT4 NOT NULL
  ,master_sig BYTEA NOT NULL CHECK (LENGTH(master_sig)=64)
  ,partner_base_url TEXT NOT NULL
  );
COMMENT ON TABLE partners
  IS 'exchanges we do wad transfers to';
COMMENT ON COLUMN partners.partner_master_pub
  IS 'offline master public key of the partner';
COMMENT ON COLUMN partners.start_date
  IS 'starting date of the partnership';
COMMENT ON COLUMN partners.end_date
  IS 'end date of the partnership';
COMMENT ON COLUMN partners.wad_frequency
  IS 'how often do we promise to do wad transfers';
COMMENT ON COLUMN partners.wad_fee_val
  IS 'how high is the fee for a wallet to be added to a wad to this partner';
COMMENT ON COLUMN partners.partner_base_url
  IS 'base URL of the REST API for this partner';
COMMENT ON COLUMN partners.master_sig
  IS 'signature of our master public key affirming the partnership, of purpose TALER_SIGNATURE_MASTER_PARTNER_DETAILS';

CREATE TABLE IF NOT EXISTS mergers
  (merge_request_serial_id BIGSERIAL UNIQUE
  ,partner_serial_id INT8 REFERENCES partners(partner_serial_id) ON DELETE CASCADE
  ,reserve_pub BYTEA NOT NULL REFERENCES reserves (reserve_pub) ON DELETE CASCADE
  ,reserve_sig BYTEA NOT NULL CHECK (LENGTH(reserve_sig)=64)
  ,purse_pub BYTEA NOT NULL CHECK (LENGTH(purse_pub)=32)
  ,purse_sig BYTEA NOT NULL CHECK (LENGTH(purse_sig)=64)
  ,merge_timestamp INT8 NOT NULL
  ,purse_expiration INT8 NOT NULL
  ,h_contract_terms BYTEA NOT NULL CHECK (LENGTH(h_contract_terms)=64)
  ,purse_val INT8 NOT NULL
  ,purse_frac INT4 NOT NULL
  ,PRIMARY KEY (purse_pub)
  ); -- partition by purse_pub; plus materialized index by reserve_pub!
COMMENT ON TABLE mergers
  IS 'Merge requests where a purse- and account-owner requested merging the purse into the account';
COMMENT ON COLUMN mergers.partner_serial_id
  IS 'identifies the partner exchange, NULL in case the target reserve lives at this exchange';
COMMENT ON COLUMN mergers.reserve_pub
  IS 'public key of the target reserve';
COMMENT ON COLUMN mergers.purse_pub
  IS 'public key of the purse';
COMMENT ON COLUMN mergers.reserve_sig
  IS 'signature by the reserve private key affirming the merge, of type TALER_SIGNATURE_WALLET_ACCOUNT_MERGE';
COMMENT ON COLUMN mergers.purse_sig
  IS 'signature by the purse private key affirming the merge, of type TALER_SIGNATURE_WALLET_PURSE_MERGE';
COMMENT ON COLUMN mergers.merge_timestamp
  IS 'when was the merge message signed';
COMMENT ON COLUMN mergers.purse_expiration
  IS 'when is the purse set to expire';
COMMENT ON COLUMN mergers.h_contract_terms
  IS 'hash of the contract terms both sides are to agree upon';
COMMENT ON COLUMN mergers.purse_val
  IS 'amount to be transferred from the purse to the reserve (excludes deposit fees)';
CREATE INDEX IF NOT EXISTS mergers_reserve_pub
  ON mergers (reserve_pub);
COMMENT ON INDEX mergers_reserve_pub
  IS 'needed in reserve history computation';

CREATE TABLE IF NOT EXISTS contracts
  (contract_serial_id BIGSERIAL UNIQUE
  ,purse_pub BYTEA NOT NULL CHECK (LENGTH(purse_pub)=32)
  ,pub_ckey BYTEA NOT NULL CHECK (LENGTH(pub_ckey)=32)
  ,e_contract BYTEA NOT NULL
  ,PRIMARY KEY (purse_pub)
  ); -- partition by purse_pub
COMMENT ON TABLE contracts
  IS 'encrypted contracts associated with purses';
COMMENT ON COLUMN contracts.purse_pub
  IS 'public key of the purse that the contract is associated with';
COMMENT ON COLUMN contracts.pub_ckey
  IS 'Public ECDH key used to encrypt the contract, to be used with the purse private key for decryption';
COMMENT ON COLUMN contracts.e_contract
  IS 'AES-GCM encrypted contract terms (contains gzip compressed JSON after decryption)';

CREATE TABLE IF NOT EXISTS history_requests
  (reserve_pub BYTEA NOT NULL CHECK (LENGTH(reserve_pub)=32) REFERENCES reserves(reserve_pub) ON DELETE CASCADE
  ,request_timestamp INT8 NOT NULL
  ,reserve_sig BYTEA NOT NULL CHECK (LENGTH(reserve_sig)=64)
  ,history_fee_val INT8 NOT NULL
  ,history_fee_frac INT4 NOT NULL
  ,PRIMARY KEY (reserve_pub,request_timestamp)
  ); -- partition by reserve_pub
COMMENT ON TABLE history_requests
  IS 'Paid history requests issued by a client against a reserve';
COMMENT ON COLUMN history_requests.request_timestamp
  IS 'When was the history request made';
COMMENT ON COLUMN history_requests.reserve_sig
  IS 'Signature approving payment for the history request';
COMMENT ON COLUMN history_requests.history_fee_val
  IS 'History fee approved by the signature';

CREATE TABLE IF NOT EXISTS close_requests
  (reserve_pub BYTEA NOT NULL CHECK (LENGTH(reserve_pub)=32) REFERENCES reserves(reserve_pub) ON DELETE CASCADE
  ,close_timestamp INT8 NOT NULL
  ,reserve_sig BYTEA NOT NULL CHECK (LENGTH(reserve_sig)=64)
  ,close_val INT8 NOT NULL
  ,close_frac INT4 NOT NULL
  ,PRIMARY KEY (reserve_pub,close_timestamp)
  ); -- partition by reserve_pub
COMMENT ON TABLE close_requests
  IS 'Explicit requests by a reserve owner to close a reserve immediately';
COMMENT ON COLUMN close_requests.close_timestamp
  IS 'When the request was created by the client';
COMMENT ON COLUMN close_requests.reserve_sig
  IS 'Signature affirming that the reserve is to be closed';
COMMENT ON COLUMN close_requests.close_val
  IS 'Balance of the reserve at the time of closing, to be wired to the associated bank account (minus the closing fee)';

CREATE TABLE IF NOT EXISTS purse_requests
  (purse_deposit_serial_id BIGSERIAL UNIQUE
  ,purse_pub BYTEA NOT NULL CHECK (LENGTH(purse_pub)=32)
  ,purse_expiration INT8 NOT NULL
  ,h_contract_terms BYTEA NOT NULL CHECK (LENGTH(h_contract_terms)=64)
  ,amount_with_fee_val INT8 NOT NULL
  ,amount_with_fee_frac INT4 NOT NULL
  ,balance_val INT8 NOT NULL
  ,balance_frac INT4 NOT NULL
  ,purse_sig BYTEA NOT NULL CHECK(LENGTH(purse_sig)=64)
  ,PRIMARY KEY (purse_pub)
  ); -- partition by purse_pub
COMMENT ON TABLE purse_requests
  IS 'Requests establishing purses, associating them with a contract but without a target reserve';
COMMENT ON COLUMN purse_requests.purse_pub
  IS 'Public key of the purse';
COMMENT ON COLUMN purse_requests.purse_expiration
  IS 'When the purse is set to expire';
COMMENT ON COLUMN purse_requests.h_contract_terms
  IS 'Hash of the contract the parties are to agree to';
COMMENT ON COLUMN purse_requests.amount_with_fee_val
  IS 'Total amount expected to be in the purse';
COMMENT ON COLUMN purse_requests.balance_val
  IS 'Total amount actually in the purse';
COMMENT ON COLUMN purse_requests.purse_sig
  IS 'Signature of the purse affirming the purse parameters, of type TALER_SIGNATURE_PURSE_REQUEST';

CREATE TABLE IF NOT EXISTS purse_deposits
  (purse_deposit_serial_id BIGSERIAL UNIQUE
  ,purse_pub BYTEA NOT NULL CHECK (LENGTH(purse_pub)=32)
  ,coin_pub BYTEA NOT NULL REFERENCES known_coins (coin_pub) ON DELETE CASCADE
  ,amount_with_fee_val INT8 NOT NULL
  ,amount_with_fee_frac INT4 NOT NULL
  ,coin_sig BYTEA NOT NULL CHECK(LENGTH(coin_sig)=64)
  ,PRIMARY KEY (purse_pub,coin_pub)
  ); -- partition by purse_pub, plus a materialized index by coin_pub!
COMMENT ON TABLE purse_deposits
  IS 'Requests depositing coins into a purse';
COMMENT ON COLUMN purse_deposits.purse_pub
  IS 'Public key of the purse';
COMMENT ON COLUMN purse_deposits.coin_pub
  IS 'Public key of the coin being deposited';
COMMENT ON COLUMN purse_deposits.amount_with_fee_val
  IS 'Total amount being deposited';
COMMENT ON COLUMN purse_deposits.coin_sig
  IS 'Signature of the coin affirming the deposit into the purse, of type TALER_SIGNATURE_PURSE_DEPOSIT';

CREATE TABLE IF NOT EXISTS wads_out
  (wad_out_serial_id BIGSERIAL UNIQUE
  ,wad_id BYTEA PRIMARY KEY CHECK (LENGTH(wad_id)=24)
  ,partner_serial_id INT8 NOT NULL REFERENCES partners(partner_serial_id) ON DELETE CASCADE
  ,amount_val INT8 NOT NULL
  ,amount_frac INT4 NOT NULL
  ,execution_time INT8 NOT NULL
  ); -- partition by wad_id
COMMENT ON TABLE wads_out
  IS 'Wire transfers made to another exchange to transfer purse funds';
COMMENT ON COLUMN wads_out.wad_id
  IS 'Unique identifier of the wad, part of the wire transfer subject';
COMMENT ON COLUMN wads_out.partner_serial_id
  IS 'target exchange of the wad';
COMMENT ON COLUMN wads_out.amount_val
  IS 'Amount that was wired';
COMMENT ON COLUMN wads_out.execution_time
  IS 'Time when the wire transfer was scheduled';

CREATE TABLE IF NOT EXISTS wad_out_entries
  (wad_out_entry_serial_id BIGSERIAL UNIQUE
  ,wad_out_serial_id INT8 REFERENCES wads_out (wad_out_serial_id) ON DELETE CASCADE
  ,reserve_pub BYTEA NOT NULL CHECK(LENGTH(reserve_pub)=32)
  ,purse_pub BYTEA PRIMARY KEY CHECK(LENGTH(purse_pub)=32)
  ,h_contract BYTEA NOT NULL CHECK(LENGTH(h_contract)=64)
  ,purse_expiration INT8 NOT NULL
  ,merge_timestamp INT8 NOT NULL
  ,amount_with_fee_val INT8 NOT NULL
  ,amount_with_fee_frac INT4 NOT NULL
  ,wad_fee_val INT8 NOT NULL
  ,wad_fee_frac INT4 NOT NULL
  ,deposit_fees_val INT8 NOT NULL
  ,deposit_fees_frac INT4 NOT NULL
  ,reserve_sig BYTEA NOT NULL CHECK (LENGTH(reserve_sig)=64)
  ,purse_sig BYTEA NOT NULL CHECK (LENGTH(purse_sig)=64)
  ); -- partition by purse_pub? do we need a materialized index by reserve_pub?
CREATE INDEX IF NOT EXISTS wad_out_entries_index_by_wad
  ON wad_out_entries (wad_out_serial_id);
COMMENT ON TABLE wad_out_entries
  IS 'Purses combined into a wad';
COMMENT ON COLUMN wad_out_entries.wad_out_serial_id
  IS 'Wad the purse was part of';
COMMENT ON COLUMN wad_out_entries.reserve_pub
  IS 'Target reserve for the purse';
COMMENT ON COLUMN wad_out_entries.purse_pub
  IS 'Public key of the purse';
COMMENT ON COLUMN wad_out_entries.h_contract
  IS 'Hash of the contract associated with the purse';
COMMENT ON COLUMN wad_out_entries.purse_expiration
  IS 'Time when the purse expires';
COMMENT ON COLUMN wad_out_entries.merge_timestamp
  IS 'Time when the merge was approved';
COMMENT ON COLUMN wad_out_entries.amount_with_fee_val
  IS 'Total amount in the purse';
COMMENT ON COLUMN wad_out_entries.wad_fee_val
  IS 'Wat fee charged to the purse';
COMMENT ON COLUMN wad_out_entries.deposit_fees_val
  IS 'Total deposit fees charged to the purse';
COMMENT ON COLUMN wad_out_entries.reserve_sig
  IS 'Signature by the receiving reserve, of purpose TALER_SIGNATURE_ACCOUNT_MERGE';
COMMENT ON COLUMN wad_out_entries.purse_sig
  IS 'Signature by the purse of purpose TALER_SIGNATURE_PURSE_MERGE';

CREATE TABLE IF NOT EXISTS wads_in
  (wad_in_serial_id BIGSERIAL UNIQUE
  ,wad_id BYTEA PRIMARY KEY CHECK (LENGTH(wad_id)=24)
  ,origin_exchange_url TEXT NOT NULL
  ,amount_val INT8 NOT NULL
  ,amount_frac INT4 NOT NULL
  ,arrival_time INT8 NOT NULL
  ,UNIQUE (wad_id, origin_exchange_url)
  ); -- partition by wad_id
COMMENT ON TABLE wads_in
  IS 'Incoming exchange-to-exchange wad wire transfers';
COMMENT ON COLUMN wads_in.wad_id
  IS 'Unique identifier of the wad, part of the wire transfer subject';
COMMENT ON COLUMN wads_in.origin_exchange_url
  IS 'Base URL of the originating URL, also part of the wire transfer subject';
COMMENT ON COLUMN wads_in.amount_val
  IS 'Actual amount that was received by our exchange';
COMMENT ON COLUMN wads_in.arrival_time
  IS 'Time when the wad was received';

CREATE TABLE IF NOT EXISTS wad_in_entries
  (wad_in_entry_serial_id BIGSERIAL UNIQUE
  ,wad_in_serial_id INT8 REFERENCES wads_in (wad_in_serial_id) ON DELETE CASCADE
  ,reserve_pub BYTEA NOT NULL CHECK(LENGTH(reserve_pub)=32)
  ,purse_pub BYTEA PRIMARY KEY CHECK(LENGTH(purse_pub)=32)
  ,h_contract BYTEA NOT NULL CHECK(LENGTH(h_contract)=64)
  ,purse_expiration INT8 NOT NULL
  ,merge_timestamp INT8 NOT NULL
  ,amount_with_fee_val INT8 NOT NULL
  ,amount_with_fee_frac INT4 NOT NULL
  ,wad_fee_val INT8 NOT NULL
  ,wad_fee_frac INT4 NOT NULL
  ,deposit_fees_val INT8 NOT NULL
  ,deposit_fees_frac INT4 NOT NULL
  ,reserve_sig BYTEA NOT NULL CHECK (LENGTH(reserve_sig)=64)
  ,purse_sig BYTEA NOT NULL CHECK (LENGTH(purse_sig)=64)
  ); -- partition by purse or reserve? likely need both (so extra table?)
COMMENT ON TABLE wad_in_entries
  IS 'list of purses aggregated in a wad according to the sending exchange';
COMMENT ON COLUMN wad_in_entries.wad_in_serial_id
  IS 'wad for which the given purse was included in the aggregation';
COMMENT ON COLUMN wad_in_entries.reserve_pub
  IS 'target account of the purse (must be at the local exchange)';
COMMENT ON COLUMN wad_in_entries.purse_pub
  IS 'public key of the purse that was merged';
COMMENT ON COLUMN wad_in_entries.h_contract
  IS 'hash of the contract terms of the purse';
COMMENT ON COLUMN wad_in_entries.purse_expiration
  IS 'Time when the purse was set to expire';
COMMENT ON COLUMN wad_in_entries.merge_timestamp
  IS 'Time when the merge was approved';
COMMENT ON COLUMN wad_in_entries.amount_with_fee_val
  IS 'Total amount in the purse';
COMMENT ON COLUMN wad_in_entries.wad_fee_val
  IS 'Total wad fees paid by the purse';
COMMENT ON COLUMN wad_in_entries.deposit_fees_val
  IS 'Total deposit fees paid when depositing coins into the purse';
COMMENT ON COLUMN wad_in_entries.reserve_sig
  IS 'Signature by the receiving reserve, of purpose TALER_SIGNATURE_ACCOUNT_MERGE';
COMMENT ON COLUMN wad_in_entries.purse_sig
  IS 'Signature by the purse of purpose TALER_SIGNATURE_PURSE_MERGE';
CREATE INDEX IF NOT EXISTS wad_in_entries_wad_in_serial
  ON wad_in_entries (wad_in_serial_id);
CREATE INDEX IF NOT EXISTS wad_in_entries_reserve_pub
  ON wad_in_entries (reserve_pub);
COMMENT ON INDEX wad_in_entries_wad_in_serial
  IS 'needed to lookup all transfers associated with a wad';
COMMENT ON INDEX wad_in_entries_reserve_pub
  IS 'needed to compute reserve history';

CREATE TABLE IF NOT EXISTS partner_accounts
  (payto_uri VARCHAR PRIMARY KEY
  ,partner_serial_id INT8 REFERENCES partners(partner_serial_id) ON DELETE CASCADE
  ,partner_master_sig BYTEA CHECK (LENGTH(partner_master_sig)=64)
  ,last_seen INT8 NOT NULL
  );
CREATE INDEX IF NOT EXISTS partner_accounts_index_by_partner_and_time
  ON partner_accounts (partner_serial_id,last_seen);
COMMENT ON TABLE partner_accounts
  IS 'Table with bank accounts of the partner exchange. Entries never expire as we need to remember the signature for the auditor.';
COMMENT ON COLUMN partner_accounts.payto_uri
  IS 'payto URI (RFC 8905) with the bank account of the partner exchange.';
COMMENT ON COLUMN partner_accounts.partner_master_sig
  IS 'Signature of purpose TALER_SIGNATURE_MASTER_WIRE_DETAILS by the partner master public key';
COMMENT ON COLUMN partner_accounts.last_seen
  IS 'Last time we saw this account as being active at the partner exchange. Used to select the most recent entry, and to detect when we should check again.';


-- Stored procedures


CREATE OR REPLACE FUNCTION exchange_do_withdraw(
  IN cs_nonce BYTEA,
  IN amount_val INT8,
  IN amount_frac INT4,
  IN h_denom_pub BYTEA,
  IN rpub BYTEA,
  IN reserve_sig BYTEA,
  IN h_coin_envelope BYTEA,
  IN denom_sig BYTEA,
  IN now INT8,
  IN min_reserve_gc INT8,
  OUT reserve_found BOOLEAN,
  OUT balance_ok BOOLEAN,
  OUT kycok BOOLEAN,
  OUT account_uuid INT8,
  OUT ruuid INT8)
LANGUAGE plpgsql
AS $$
DECLARE
  reserve_gc INT8;
DECLARE
  denom_serial INT8;
DECLARE
  reserve_val INT8;
DECLARE
  reserve_frac INT4;
BEGIN
-- Shards: reserves by reserve_pub (SELECT)
--         reserves_out (INSERT, with CONFLICT detection) by wih
--         reserves by reserve_pub (UPDATE)
--         reserves_in by reserve_pub (SELECT)
--         wire_targets by wire_target_h_payto

SELECT denominations_serial
  INTO denom_serial
  FROM denominations
 WHERE denom_pub_hash=h_denom_pub;

IF NOT FOUND
THEN
  -- denomination unknown, should be impossible!
  reserve_found=FALSE;
  balance_ok=FALSE;
  kycok=FALSE;
  account_uuid=0;
  ruuid=0;
  ASSERT false, 'denomination unknown';
  RETURN;
END IF;


SELECT
   current_balance_val
  ,current_balance_frac
  ,gc_date
  ,reserve_uuid
 INTO
   reserve_val
  ,reserve_frac
  ,reserve_gc
  ,ruuid
  FROM reserves
 WHERE reserves.reserve_pub=rpub;

IF NOT FOUND
THEN
  -- reserve unknown
  reserve_found=FALSE;
  balance_ok=FALSE;
  kycok=FALSE;
  account_uuid=0;
  ruuid=2;
  RETURN;
END IF;

-- We optimistically insert, and then on conflict declare
-- the query successful due to idempotency.
INSERT INTO reserves_out
  (h_blind_ev
  ,denominations_serial
  ,denom_sig
  ,reserve_uuid
  ,reserve_sig
  ,execution_date
  ,amount_with_fee_val
  ,amount_with_fee_frac)
VALUES
  (h_coin_envelope
  ,denom_serial
  ,denom_sig
  ,ruuid
  ,reserve_sig
  ,now
  ,amount_val
  ,amount_frac)
ON CONFLICT DO NOTHING;

IF NOT FOUND
THEN
  -- idempotent query, all constraints must be satisfied
  reserve_found=TRUE;
  balance_ok=TRUE;
  kycok=TRUE;
  account_uuid=0;
  RETURN;
END IF;

-- Check reserve balance is sufficient.
IF (reserve_val > amount_val)
THEN
  IF (reserve_frac >= amount_frac)
  THEN
    reserve_val=reserve_val - amount_val;
    reserve_frac=reserve_frac - amount_frac;
  ELSE
    reserve_val=reserve_val - amount_val - 1;
    reserve_frac=reserve_frac + 100000000 - amount_frac;
  END IF;
ELSE
  IF (reserve_val = amount_val) AND (reserve_frac >= amount_frac)
  THEN
    reserve_val=0;
    reserve_frac=reserve_frac - amount_frac;
  ELSE
    reserve_found=TRUE;
    balance_ok=FALSE;
    kycok=FALSE; -- we do not really know or care
    account_uuid=0;
    RETURN;
  END IF;
END IF;

-- Calculate new expiration dates.
min_reserve_gc=GREATEST(min_reserve_gc,reserve_gc);

-- Update reserve balance.
UPDATE reserves SET
  gc_date=min_reserve_gc
 ,current_balance_val=reserve_val
 ,current_balance_frac=reserve_frac
WHERE
  reserves.reserve_pub=rpub;

reserve_found=TRUE;
balance_ok=TRUE;



-- Special actions needed for a CS withdraw?
IF NOT NULL cs_nonce
THEN
  -- Cache CS signature to prevent replays in the future
  -- (and check if cached signature exists at the same time).
  INSERT INTO cs_nonce_locks
    (nonce
    ,max_denomination_serial
    ,op_hash)
  VALUES
    (cs_nonce
    ,denom_serial
    ,h_coin_envelope)
  ON CONFLICT DO NOTHING;

  IF NOT FOUND
  THEN
    -- See if the existing entry is identical.
    SELECT 1
      FROM cs_nonce_locks
     WHERE nonce=cs_nonce
       AND op_hash=h_coin_envelope;
    IF NOT FOUND
    THEN
      reserve_found=FALSE;
      balance_ok=FALSE;
      kycok=FALSE;
      account_uuid=0;
      ruuid=1; -- FIXME: return error message more nicely!
      ASSERT false, 'nonce reuse attempted by client';
    END IF;
  END IF;
END IF;



-- Obtain KYC status based on the last wire transfer into
-- this reserve. FIXME: likely not adequate for reserves that got P2P transfers!
SELECT
   kyc_ok
  ,wire_target_serial_id
  INTO
   kycok
  ,account_uuid
  FROM reserves_in
  JOIN wire_targets ON (wire_source_h_payto = wire_target_h_payto)
 WHERE reserve_pub=rpub
 LIMIT 1; -- limit 1 should not be required (without p2p transfers)


END $$;

COMMENT ON FUNCTION exchange_do_withdraw(BYTEA, INT8, INT4, BYTEA, BYTEA, BYTEA, BYTEA, BYTEA, INT8, INT8)
  IS 'Checks whether the reserve has sufficient balance for a withdraw operation (or the request is repeated and was previously approved) and if so updates the database with the result';



CREATE OR REPLACE FUNCTION exchange_do_withdraw_limit_check(
  IN ruuid INT8,
  IN start_time INT8,
  IN upper_limit_val INT8,
  IN upper_limit_frac INT4,
  OUT below_limit BOOLEAN)
LANGUAGE plpgsql
AS $$
DECLARE
  total_val INT8;
DECLARE
  total_frac INT8; -- INT4 could overflow during accumulation!
BEGIN
-- NOTE: Read-only, but crosses shards.
-- Shards: reserves by reserve_pub
--         reserves_out by reserve_uuid -- crosses shards!!


SELECT
   SUM(amount_with_fee_val) -- overflow here is not plausible
  ,SUM(CAST(amount_with_fee_frac AS INT8)) -- compute using 64 bits
  INTO
   total_val
  ,total_frac
  FROM reserves_out
 WHERE reserve_uuid=ruuid
   AND execution_date > start_time;

-- normalize result
total_val = total_val + total_frac / 100000000;
total_frac = total_frac % 100000000;

-- compare to threshold
below_limit = (total_val < upper_limit_val) OR
            ( (total_val = upper_limit_val) AND
              (total_frac <= upper_limit_frac) );
END $$;

COMMENT ON FUNCTION exchange_do_withdraw_limit_check(INT8, INT8, INT8, INT4)
  IS 'Check whether the withdrawals from the given reserve since the given time are below the given threshold';


-- NOTE: experiment, currently dead, see postgres_Start_deferred_wire_out;
-- now done inline. FIXME: Remove code here once inline version is confirmed working nicely!
CREATE OR REPLACE PROCEDURE defer_wire_out()
LANGUAGE plpgsql
AS $$
BEGIN

IF EXISTS (
  SELECT 1
    FROM information_Schema.constraint_column_usage
   WHERE table_name='wire_out'
     AND constraint_name='wire_out_ref')
THEN
  SET CONSTRAINTS wire_out_ref DEFERRED;
END IF;

END $$;


CREATE OR REPLACE FUNCTION exchange_do_deposit(
  IN in_amount_with_fee_val INT8,
  IN in_amount_with_fee_frac INT4,
  IN in_h_contract_terms BYTEA,
  IN in_wire_salt BYTEA,
  IN in_wallet_timestamp INT8,
  IN in_exchange_timestamp INT8,
  IN in_refund_deadline INT8,
  IN in_wire_deadline INT8,
  IN in_merchant_pub BYTEA,
  IN in_receiver_wire_account VARCHAR,
  IN in_h_payto BYTEA,
  IN in_known_coin_id INT8,
  IN in_coin_pub BYTEA,
  IN in_coin_sig BYTEA,
  IN in_shard INT8,
  IN in_extension_blocked BOOLEAN,
  IN in_extension_details VARCHAR,
  OUT out_exchange_timestamp INT8,
  OUT out_balance_ok BOOLEAN,
  OUT out_conflict BOOLEAN)
LANGUAGE plpgsql
AS $$
DECLARE
  wtsi INT8; -- wire target serial id
DECLARE
  xdi INT8; -- eXstension details serial id
BEGIN
-- Shards: INSERT extension_details (by extension_details_serial_id)
--         INSERT wire_targets (by h_payto), on CONFLICT DO NOTHING;
--         INSERT deposits (by shard + merchant_pub + h_payto), ON CONFLICT DO NOTHING;
--         UPDATE known_coins (by coin_pub)

IF NOT NULL in_extension_details
THEN
  INSERT INTO extension_details
  (extension_options)
  VALUES
    (in_extension_details)
  RETURNING extension_details_serial_id INTO xdi;
ELSE
  xdi=NULL;
END IF;


INSERT INTO wire_targets
  (wire_target_h_payto
  ,payto_uri)
  VALUES
  (in_h_payto
  ,in_receiver_wire_account)
ON CONFLICT DO NOTHING -- for CONFLICT ON (wire_target_h_payto)
  RETURNING wire_target_serial_id INTO wtsi;

IF NOT FOUND
THEN
  SELECT wire_target_serial_id
  INTO wtsi
  FROM wire_targets
  WHERE wire_target_h_payto=in_h_payto;
END IF;


INSERT INTO deposits
  (shard
  ,coin_pub
  ,known_coin_id
  ,amount_with_fee_val
  ,amount_with_fee_frac
  ,wallet_timestamp
  ,exchange_timestamp
  ,refund_deadline
  ,wire_deadline
  ,merchant_pub
  ,h_contract_terms
  ,coin_sig
  ,wire_salt
  ,wire_target_h_payto
  ,extension_blocked
  ,extension_details_serial_id
  )
  VALUES
  (in_shard
  ,in_coin_pub
  ,in_known_coin_id
  ,in_amount_with_fee_val
  ,in_amount_with_fee_frac
  ,in_wallet_timestamp
  ,in_exchange_timestamp
  ,in_refund_deadline
  ,in_wire_deadline
  ,in_merchant_pub
  ,in_h_contract_terms
  ,in_coin_sig
  ,in_wire_salt
  ,in_h_payto
  ,in_extension_blocked
  ,xdi)
  ON CONFLICT DO NOTHING;

IF NOT FOUND
THEN
  -- Idempotency check: see if an identical record exists.
  -- Note that by checking 'coin_sig', we implicitly check
  -- identity over everything that the signature covers.
  -- We do select over merchant_pub and wire_target_h_payto
  -- primarily here to maximally use the existing index.
  SELECT
     exchange_timestamp
   INTO
     out_exchange_timestamp
   FROM deposits
   WHERE shard=in_shard
     AND merchant_pub=in_merchant_pub
     AND wire_target_h_payto=in_h_payto
     AND coin_pub=in_coin_pub
     AND coin_sig=in_coin_sig;

  IF NOT FOUND
  THEN
    -- Deposit exists, but with differences. Not allowed.
    out_balance_ok=FALSE;
    out_conflict=TRUE;
    RETURN;
  END IF;

  -- Idempotent request known, return success.
  out_balance_ok=TRUE;
  out_conflict=FALSE;

  RETURN;
END IF;


out_exchange_timestamp=in_exchange_timestamp;

-- Check and update balance of the coin.
UPDATE known_coins
  SET
    remaining_frac=remaining_frac-in_amount_with_fee_frac
       + CASE
         WHEN remaining_frac < in_amount_with_fee_frac
         THEN 100000000
         ELSE 0
         END,
    remaining_val=remaining_val-in_amount_with_fee_val
       - CASE
         WHEN remaining_frac < in_amount_with_fee_frac
         THEN 1
         ELSE 0
         END
  WHERE coin_pub=in_coin_pub
    AND ( (remaining_val > in_amount_with_fee_val) OR
          ( (remaining_frac >= in_amount_with_fee_frac) AND
            (remaining_val >= in_amount_with_fee_val) ) );

IF NOT FOUND
THEN
  -- Insufficient balance.
  out_balance_ok=FALSE;
  out_conflict=FALSE;
  RETURN;
END IF;

-- Everything fine, return success!
out_balance_ok=TRUE;
out_conflict=FALSE;

END $$;



CREATE OR REPLACE FUNCTION exchange_do_melt(
  IN in_cs_rms BYTEA,
  IN in_amount_with_fee_val INT8,
  IN in_amount_with_fee_frac INT4,
  IN in_rc BYTEA,
  IN in_old_coin_pub BYTEA,
  IN in_old_coin_sig BYTEA,
  IN in_known_coin_id INT8, -- not used, but that's OK
  IN in_noreveal_index INT4,
  IN in_zombie_required BOOLEAN,
  OUT out_balance_ok BOOLEAN,
  OUT out_zombie_bad BOOLEAN,
  OUT out_noreveal_index INT4)
LANGUAGE plpgsql
AS $$
DECLARE
  denom_max INT8;
BEGIN
-- Shards: INSERT refresh_commitments (by rc)
-- (rare:) SELECT refresh_commitments (by old_coin_pub) -- crosses shards!
-- (rare:) SEELCT refresh_revealed_coins (by melt_serial_id)
-- (rare:) PERFORM recoup_refresh (by rrc_serial) -- crosses shards!
--         UPDATE known_coins (by coin_pub)

INSERT INTO refresh_commitments
  (rc
  ,old_coin_pub
  ,old_coin_sig
  ,amount_with_fee_val
  ,amount_with_fee_frac
  ,noreveal_index
  )
  VALUES
  (in_rc
  ,in_old_coin_pub
  ,in_old_coin_sig
  ,in_amount_with_fee_val
  ,in_amount_with_fee_frac
  ,in_noreveal_index)
  ON CONFLICT DO NOTHING;

IF NOT FOUND
THEN
  -- Idempotency check: see if an identical record exists.
  out_noreveal_index=-1;
  SELECT
     noreveal_index
    INTO
     out_noreveal_index
    FROM refresh_commitments
   WHERE rc=in_rc;
  out_balance_ok=FOUND;
  out_zombie_bad=FALSE; -- zombie is OK
  RETURN;
END IF;


IF in_zombie_required
THEN
  -- Check if this coin was part of a refresh
  -- operation that was subsequently involved
  -- in a recoup operation.  We begin by all
  -- refresh operations our coin was involved
  -- with, then find all associated reveal
  -- operations, and then see if any of these
  -- reveal operations was involved in a recoup.
  PERFORM
    FROM recoup_refresh
   WHERE rrc_serial IN
    (SELECT rrc_serial
       FROM refresh_revealed_coins
      WHERE melt_serial_id IN
      (SELECT melt_serial_id
         FROM refresh_commitments
        WHERE old_coin_pub=in_old_coin_pub));
  IF NOT FOUND
  THEN
    out_zombie_bad=TRUE;
    out_balance_ok=FALSE;
    RETURN;
  END IF;
END IF;

out_zombie_bad=FALSE; -- zombie is OK


-- Check and update balance of the coin.
UPDATE known_coins
  SET
    remaining_frac=remaining_frac-in_amount_with_fee_frac
       + CASE
         WHEN remaining_frac < in_amount_with_fee_frac
         THEN 100000000
         ELSE 0
         END,
    remaining_val=remaining_val-in_amount_with_fee_val
       - CASE
         WHEN remaining_frac < in_amount_with_fee_frac
         THEN 1
         ELSE 0
         END
  WHERE coin_pub=in_old_coin_pub
    AND ( (remaining_val > in_amount_with_fee_val) OR
          ( (remaining_frac >= in_amount_with_fee_frac) AND
            (remaining_val >= in_amount_with_fee_val) ) );

IF NOT FOUND
THEN
  -- Insufficient balance.
  out_noreveal_index=-1;
  out_balance_ok=FALSE;
  RETURN;
END IF;



-- Special actions needed for a CS melt?
IF NOT NULL in_cs_rms
THEN
  -- Get maximum denominations serial value in
  -- existence, this will determine how long the
  -- nonce will be locked.
  SELECT
      denominations_serial
    INTO
      denom_max
    FROM denominations
      ORDER BY denominations_serial DESC
      LIMIT 1;

  -- Cache CS signature to prevent replays in the future
  -- (and check if cached signature exists at the same time).
  INSERT INTO cs_nonce_locks
    (nonce
    ,max_denomination_serial
    ,op_hash)
  VALUES
    (cs_rms
    ,denom_serial
    ,in_rc)
  ON CONFLICT DO NOTHING;

  IF NOT FOUND
  THEN
    -- Record exists, make sure it is the same
    SELECT 1
      FROM cs_nonce_locks
     WHERE nonce=cs_rms
       AND op_hash=in_rc;

    IF NOT FOUND
    THEN
       -- Nonce reuse detected
       out_balance_ok=FALSE;
       out_zombie_bad=FALSE;
       out_noreveal_index=42; -- FIXME: return error message more nicely!
       ASSERT false, 'nonce reuse attempted by client';
    END IF;
  END IF;
END IF;




-- Everything fine, return success!
out_balance_ok=TRUE;
out_noreveal_index=in_noreveal_index;

END $$;



CREATE OR REPLACE FUNCTION exchange_do_refund(
  IN in_amount_with_fee_val INT8,
  IN in_amount_with_fee_frac INT4,
  IN in_amount_val INT8,
  IN in_amount_frac INT4,
  IN in_deposit_fee_val INT8,
  IN in_deposit_fee_frac INT4,
  IN in_h_contract_terms BYTEA,
  IN in_rtransaction_id INT8,
  IN in_deposit_shard INT8,
  IN in_known_coin_id INT8,
  IN in_coin_pub BYTEA,
  IN in_merchant_pub BYTEA,
  IN in_merchant_sig BYTEA,
  OUT out_not_found BOOLEAN,
  OUT out_refund_ok BOOLEAN,
  OUT out_gone BOOLEAN,
  OUT out_conflict BOOLEAN)
LANGUAGE plpgsql
AS $$
DECLARE
  dsi INT8; -- ID of deposit being refunded
DECLARE
  tmp_val INT8; -- total amount refunded
DECLARE
  tmp_frac INT8; -- total amount refunded
DECLARE
  deposit_val INT8; -- amount that was originally deposited
DECLARE
  deposit_frac INT8; -- amount that was originally deposited
BEGIN
-- Shards: SELECT deposits (by shard, coin_pub, h_contract_terms, merchant_pub)
--         INSERT refunds (by deposit_serial_id, rtransaction_id) ON CONFLICT DO NOTHING
--         SELECT refunds (by deposit_serial_id)
--         UPDATE known_coins (by coin_pub)

SELECT
   dep.deposit_serial_id
  ,dep.amount_with_fee_val
  ,dep.amount_with_fee_frac
  ,dep.done
INTO
   dsi
  ,deposit_val
  ,deposit_frac
  ,out_gone
FROM deposits_by_coin dbc
  JOIN deposits dep USING (shard,deposit_serial_id)
 WHERE dbc.coin_pub=in_coin_pub
  AND dep.shard=in_deposit_shard
  AND dep.merchant_pub=in_merchant_pub
  AND dep.h_contract_terms=in_h_contract_terms;

IF NOT FOUND
THEN
  -- No matching deposit found!
  out_refund_ok=FALSE;
  out_conflict=FALSE;
  out_not_found=TRUE;
  out_gone=FALSE;
  RETURN;
END IF;


INSERT INTO refunds
  (deposit_serial_id
  ,shard
  ,merchant_sig
  ,rtransaction_id
  ,amount_with_fee_val
  ,amount_with_fee_frac
  )
  VALUES
  (dsi
  ,in_deposit_shard
  ,in_merchant_sig
  ,in_rtransaction_id
  ,in_amount_with_fee_val
  ,in_amount_with_fee_frac)
  ON CONFLICT DO NOTHING;

IF NOT FOUND
THEN
  -- Idempotency check: see if an identical record exists.
  -- Note that by checking 'coin_sig', we implicitly check
  -- identity over everything that the signature covers.
  -- We do select over merchant_pub and h_contract_terms
  -- primarily here to maximally use the existing index.
   PERFORM
   FROM refunds
   WHERE shard=in_deposit_shard
     AND deposit_serial_id=dsi
     AND rtransaction_id=in_rtransaction_id
     AND amount_with_fee_val=in_amount_with_fee_val
     AND amount_with_fee_frac=in_amount_with_fee_frac;

  IF NOT FOUND
  THEN
    -- Deposit exists, but have conflicting refund.
    out_refund_ok=FALSE;
    out_conflict=TRUE;
    out_not_found=FALSE;
    RETURN;
  END IF;

  -- Idempotent request known, return success.
  out_refund_ok=TRUE;
  out_conflict=FALSE;
  out_not_found=FALSE;
  out_gone=FALSE;
  RETURN;
END IF;


IF out_gone
THEN
  -- money already sent to the merchant. Tough luck.
  out_refund_ok=FALSE;
  out_conflict=FALSE;
  out_not_found=FALSE;
  RETURN;
END IF;



-- Check refund balance invariant.
SELECT
   SUM(amount_with_fee_val) -- overflow here is not plausible
  ,SUM(CAST(amount_with_fee_frac AS INT8)) -- compute using 64 bits
  INTO
   tmp_val
  ,tmp_frac
  FROM refunds
  WHERE shard=in_deposit_shard
    AND deposit_serial_id=dsi;
IF tmp_val IS NULL
THEN
  RAISE NOTICE 'failed to sum up existing refunds';
  out_refund_ok=FALSE;
  out_conflict=FALSE;
  out_not_found=FALSE;
  RETURN;
END IF;

-- Normalize result before continuing
tmp_val = tmp_val + tmp_frac / 100000000;
tmp_frac = tmp_frac % 100000000;

-- Actually check if the deposits are sufficient for the refund. Verbosely. ;-)
IF (tmp_val < deposit_val)
THEN
  out_refund_ok=TRUE;
ELSE
  IF (tmp_val = deposit_val) AND (tmp_frac <= deposit_frac)
  THEN
    out_refund_ok=TRUE;
  ELSE
    out_refund_ok=FALSE;
  END IF;
END IF;

IF (tmp_val = deposit_val) AND (tmp_frac = deposit_frac)
THEN
  -- Refunds have reached the full value of the original
  -- deposit. Also refund the deposit fee.
  in_amount_frac = in_amount_frac + in_deposit_fee_frac;
  in_amount_val = in_amount_val + in_deposit_fee_val;

  -- Normalize result before continuing
  in_amount_val = in_amount_val + in_amount_frac / 100000000;
  in_amount_frac = in_amount_frac % 100000000;
END IF;

-- Update balance of the coin.
UPDATE known_coins
  SET
    remaining_frac=remaining_frac+in_amount_frac
       - CASE
         WHEN remaining_frac+in_amount_frac >= 100000000
         THEN 100000000
         ELSE 0
         END,
    remaining_val=remaining_val+in_amount_val
       + CASE
         WHEN remaining_frac+in_amount_frac >= 100000000
         THEN 1
         ELSE 0
         END
  WHERE coin_pub=in_coin_pub;


out_conflict=FALSE;
out_not_found=FALSE;

END $$;

-- COMMENT ON FUNCTION exchange_do_refund(INT8, INT4, BYTEA, BOOLEAN, BOOLEAN)
--  IS 'Executes a refund operation, checking that the corresponding deposit was sufficient to cover the refunded amount';


CREATE OR REPLACE FUNCTION exchange_do_recoup_to_reserve(
  IN in_reserve_pub BYTEA,
  IN in_reserve_out_serial_id INT8,
  IN in_coin_blind BYTEA,
  IN in_coin_pub BYTEA,
  IN in_known_coin_id INT8,
  IN in_coin_sig BYTEA,
  IN in_reserve_gc INT8,
  IN in_reserve_expiration INT8,
  IN in_recoup_timestamp INT8,
  OUT out_recoup_ok BOOLEAN,
  OUT out_internal_failure BOOLEAN,
  OUT out_recoup_timestamp INT8)
LANGUAGE plpgsql
AS $$
DECLARE
  tmp_val INT8; -- amount recouped
DECLARE
  tmp_frac INT8; -- amount recouped
BEGIN
-- Shards: SELECT known_coins (by coin_pub)
--         SELECT recoup      (by coin_pub)
--         UPDATE known_coins (by coin_pub)
--         UPDATE reserves (by reserve_pub)
--         INSERT recoup      (by coin_pub)

out_internal_failure=FALSE;


-- Check remaining balance of the coin.
SELECT
   remaining_frac
  ,remaining_val
 INTO
   tmp_frac
  ,tmp_val
FROM known_coins
  WHERE coin_pub=in_coin_pub;

IF NOT FOUND
THEN
  out_internal_failure=TRUE;
  out_recoup_ok=FALSE;
  RETURN;
END IF;

IF tmp_val + tmp_frac = 0
THEN
  -- Check for idempotency
  SELECT
    recoup_timestamp
  INTO
    out_recoup_timestamp
    FROM recoup
    WHERE coin_pub=in_coin_pub;

  out_recoup_ok=FOUND;
  RETURN;
END IF;


-- Update balance of the coin.
UPDATE known_coins
  SET
     remaining_frac=0
    ,remaining_val=0
  WHERE coin_pub=in_coin_pub;


-- Credit the reserve and update reserve timers.
UPDATE reserves
  SET
    current_balance_frac=current_balance_frac+tmp_frac
       - CASE
         WHEN current_balance_frac+tmp_frac >= 100000000
         THEN 100000000
         ELSE 0
         END,
    current_balance_val=current_balance_val+tmp_val
       + CASE
         WHEN current_balance_frac+tmp_frac >= 100000000
         THEN 1
         ELSE 0
         END,
    gc_date=GREATEST(gc_date, in_reserve_gc),
    expiration_date=GREATEST(expiration_date, in_reserve_expiration)
  WHERE reserve_pub=in_reserve_pub;


IF NOT FOUND
THEN
  RAISE NOTICE 'failed to increase reserve balance from recoup';
  out_recoup_ok=TRUE;
  out_internal_failure=TRUE;
  RETURN;
END IF;


INSERT INTO recoup
  (coin_pub
  ,coin_sig
  ,coin_blind
  ,amount_val
  ,amount_frac
  ,recoup_timestamp
  ,reserve_out_serial_id
  )
VALUES
  (in_coin_pub
  ,in_coin_sig
  ,in_coin_blind
  ,tmp_val
  ,tmp_frac
  ,in_recoup_timestamp
  ,in_reserve_out_serial_id);

-- Normal end, everything is fine.
out_recoup_ok=TRUE;
out_recoup_timestamp=in_recoup_timestamp;

END $$;

-- COMMENT ON FUNCTION exchange_do_recoup_to_reserve(INT8, INT4, BYTEA, BOOLEAN, BOOLEAN)
--  IS 'Executes a recoup of a coin that was withdrawn from a reserve';






CREATE OR REPLACE FUNCTION exchange_do_recoup_to_coin(
  IN in_old_coin_pub BYTEA,
  IN in_rrc_serial INT8,
  IN in_coin_blind BYTEA,
  IN in_coin_pub BYTEA,
  IN in_known_coin_id INT8,
  IN in_coin_sig BYTEA,
  IN in_recoup_timestamp INT8,
  OUT out_recoup_ok BOOLEAN,
  OUT out_internal_failure BOOLEAN,
  OUT out_recoup_timestamp INT8)
LANGUAGE plpgsql
AS $$
DECLARE
  tmp_val INT8; -- amount recouped
DECLARE
  tmp_frac INT8; -- amount recouped
BEGIN

-- Shards: UPDATE known_coins (by coin_pub)
--         SELECT recoup_refresh (by coin_pub)
--         UPDATE known_coins (by coin_pub)
--         INSERT recoup_refresh (by coin_pub)


out_internal_failure=FALSE;


-- Check remaining balance of the coin.
SELECT
   remaining_frac
  ,remaining_val
 INTO
   tmp_frac
  ,tmp_val
FROM known_coins
  WHERE coin_pub=in_coin_pub;

IF NOT FOUND
THEN
  out_internal_failure=TRUE;
  out_recoup_ok=FALSE;
  RETURN;
END IF;

IF tmp_val + tmp_frac = 0
THEN
  -- Check for idempotency
  SELECT
      recoup_timestamp
    INTO
      out_recoup_timestamp
    FROM recoup_refresh
    WHERE coin_pub=in_coin_pub;
  out_recoup_ok=FOUND;
  RETURN;
END IF;

-- Update balance of the coin.
UPDATE known_coins
  SET
     remaining_frac=0
    ,remaining_val=0
  WHERE coin_pub=in_coin_pub;


-- Credit the old coin.
UPDATE known_coins
  SET
    remaining_frac=remaining_frac+tmp_frac
       - CASE
         WHEN remaining_frac+tmp_frac >= 100000000
         THEN 100000000
         ELSE 0
         END,
    remaining_val=remaining_val+tmp_val
       + CASE
         WHEN remaining_frac+tmp_frac >= 100000000
         THEN 1
         ELSE 0
         END
  WHERE coin_pub=in_old_coin_pub;


IF NOT FOUND
THEN
  RAISE NOTICE 'failed to increase old coin balance from recoup';
  out_recoup_ok=TRUE;
  out_internal_failure=TRUE;
  RETURN;
END IF;


INSERT INTO recoup_refresh
  (coin_pub
  ,known_coin_id
  ,coin_sig
  ,coin_blind
  ,amount_val
  ,amount_frac
  ,recoup_timestamp
  ,rrc_serial
  )
VALUES
  (in_coin_pub
  ,in_known_coin_id
  ,in_coin_sig
  ,in_coin_blind
  ,tmp_val
  ,tmp_frac
  ,in_recoup_timestamp
  ,in_rrc_serial);

-- Normal end, everything is fine.
out_recoup_ok=TRUE;
out_recoup_timestamp=in_recoup_timestamp;

END $$;


-- COMMENT ON FUNCTION exchange_do_recoup_to_coin(INT8, INT4, BYTEA, BOOLEAN, BOOLEAN)
--  IS 'Executes a recoup-refresh of a coin that was obtained from a refresh-reveal process';



CREATE OR REPLACE PROCEDURE exchange_do_gc(
  IN in_ancient_date INT8,
  IN in_now INT8)
LANGUAGE plpgsql
AS $$
DECLARE
  reserve_uuid_min INT8; -- minimum reserve UUID still alive
DECLARE
  melt_min INT8; -- minimum melt still alive
DECLARE
  coin_min INT8; -- minimum known_coin still alive
DECLARE
  deposit_min INT8; -- minimum deposit still alive
DECLARE
  reserve_out_min INT8; -- minimum reserve_out still alive
DECLARE
  denom_min INT8; -- minimum denomination still alive
BEGIN

DELETE FROM prewire
  WHERE finished=TRUE;

DELETE FROM wire_fee
  WHERE end_date < in_ancient_date;

-- TODO: use closing fee as threshold?
DELETE FROM reserves
  WHERE gc_date < in_now
    AND current_balance_val = 0
    AND current_balance_frac = 0;

SELECT
     reserve_out_serial_id
  INTO
     reserve_out_min
  FROM reserves_out
  ORDER BY reserve_out_serial_id ASC
  LIMIT 1;

DELETE FROM recoup
  WHERE reserve_out_serial_id < reserve_out_min;
-- FIXME: recoup_refresh lacks GC!

SELECT
     reserve_uuid
  INTO
     reserve_uuid_min
  FROM reserves
  ORDER BY reserve_uuid ASC
  LIMIT 1;

DELETE FROM reserves_out
  WHERE reserve_uuid < reserve_uuid_min;

-- FIXME: this query will be horribly slow;
-- need to find another way to formulate it...
DELETE FROM denominations
  WHERE expire_legal < in_now
    AND denominations_serial NOT IN
      (SELECT DISTINCT denominations_serial
         FROM reserves_out)
    AND denominations_serial NOT IN
      (SELECT DISTINCT denominations_serial
         FROM known_coins
        WHERE coin_pub IN
          (SELECT DISTINCT coin_pub
             FROM recoup))
    AND denominations_serial NOT IN
      (SELECT DISTINCT denominations_serial
         FROM known_coins
        WHERE coin_pub IN
          (SELECT DISTINCT coin_pub
             FROM recoup_refresh));

SELECT
     melt_serial_id
  INTO
     melt_min
  FROM refresh_commitments
  ORDER BY melt_serial_id ASC
  LIMIT 1;

DELETE FROM refresh_revealed_coins
  WHERE melt_serial_id < melt_min;

DELETE FROM refresh_transfer_keys
  WHERE melt_serial_id < melt_min;

SELECT
     known_coin_id
  INTO
     coin_min
  FROM known_coins
  ORDER BY known_coin_id ASC
  LIMIT 1;

DELETE FROM deposits
  WHERE known_coin_id < coin_min;

SELECT
     deposit_serial_id
  INTO
     deposit_min
  FROM deposits
  ORDER BY deposit_serial_id ASC
  LIMIT 1;

DELETE FROM refunds
  WHERE deposit_serial_id < deposit_min;

DELETE FROM aggregation_tracking
  WHERE deposit_serial_id < deposit_min;

SELECT
     denominations_serial
  INTO
     denom_min
  FROM denominations
  ORDER BY denominations_serial ASC
  LIMIT 1;

DELETE FROM cs_nonce_locks
  WHERE max_denomination_serial <= denom_min;

END $$;


-- Complete transaction
COMMIT;
