[taler-merchant] branch master updated: extract SQL fron C code

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grothoff pushed a commit to branch master
in repository merchant.

The following commit(s) were added to refs/heads/master by this push:
     new b3e1b09  extract SQL fron C code
b3e1b09 is described below

commit b3e1b0985e69b1b455d895b204bcaedefe6691ca
Author: Christian Grothoff <address@hidden>
AuthorDate: Fri Jan 24 14:36:19 2020 +0100

    extract SQL fron C code
---
 src/backenddb/0000.sql                     | 293 +++++++++++++++++++++++++++++
 src/backenddb/0001.sql                     | 171 +++++++++++++++++
 src/backenddb/Makefile.am                  |  10 +-
 src/backenddb/drop0000.sql                 |  24 +++
 src/backenddb/plugin_merchantdb_postgres.c |   2 +-
 5 files changed, 498 insertions(+), 2 deletions(-)

diff --git a/src/backenddb/0000.sql b/src/backenddb/0000.sql
new file mode 100644
index 0000000..1483e20
--- /dev/null
+++ b/src/backenddb/0000.sql
@@ -0,0 +1,293 @@
+-- LICENSE AND COPYRIGHT
+--
+-- Copyright (C) 2010 Hubert depesz Lubaczewski
+--
+-- This program is distributed under the (Revised) BSD License:
+-- L<http://www.opensource.org/licenses/bsd-license.php>
+--
+-- Redistribution and use in source and binary forms, with or without
+-- modification, are permitted provided that the following conditions
+-- are met:
+--
+-- * Redistributions of source code must retain the above copyright
+-- notice, this list of conditions and the following disclaimer.
+--
+-- * Redistributions in binary form must reproduce the above copyright
+--   notice, this list of conditions and the following disclaimer in the
+--   documentation and/or other materials provided with the distribution.
+--
+-- * Neither the name of Hubert depesz Lubaczewski's Organization
+--   nor the names of its contributors may be used to endorse or
+--   promote products derived from this software without specific
+--   prior written permission.
+--
+-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
ARE
+-- DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+-- SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+-- CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
LIABILITY,
+-- OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 
USE
+-- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+--
+-- Code origin: 
https://gitlab.com/depesz/Versioning/blob/master/install.versioning.sql
+--
+--
+-- # NAME
+--
+-- **Versioning** - simplistic take on tracking and applying changes to 
databases.
+--
+-- # DESCRIPTION
+--
+-- This project strives to provide simple way to manage changes to
+-- database.
+--
+-- Instead of making changes on development server, then finding
+-- differences between production and development, deciding which ones
+-- should be installed on production, and finding a way to install them -
+-- you start with writing diffs themselves!
+--
+-- # INSTALLATION
+--
+-- To install versioning simply run install.versioning.sql in your database
+-- (all of them: production, stage, test, devel, ...).
+--
+-- # USAGE
+--
+-- In your files with patches to database, put whole logic in single
+-- transaction, and use \_v.\* functions - usually \_v.register_patch() at
+-- least to make sure everything is OK.
+--
+-- For example. Let's assume you have patch files:
+--
+-- ## 0001.sql:
+--
+-- ```
+-- create table users (id serial primary key, username text);
+-- ```
+--
+-- ## 0002.sql:
+--
+-- ```
+-- insert into users (username) values ('depesz');
+-- ```
+-- To change it to use versioning you would change the files, to this
+-- state:
+--
+-- 0000.sql:
+--
+-- ```
+-- BEGIN;
+-- select _v.register_patch('000-base', NULL, NULL);
+-- create table users (id serial primary key, username text);
+-- COMMIT;
+-- ```
+--
+-- ## 0002.sql:
+--
+-- ```
+-- BEGIN;
+-- select _v.register_patch('001-users', ARRAY['000-base'], NULL);
+-- insert into users (username) values ('depesz');
+-- COMMIT;
+-- ```
+--
+-- This will make sure that patch 001-users can only be applied after
+-- 000-base.
+--
+-- # AVAILABLE FUNCTIONS
+--
+-- ## \_v.register_patch( TEXT )
+--
+-- Registers named patch, or dies if it is already registered.
+--
+-- Returns integer which is id of patch in \_v.patches table - only if it
+-- succeeded.
+--
+-- ## \_v.register_patch( TEXT, TEXT[] )
+--
+-- Same as \_v.register_patch( TEXT ), but checks is all given patches (given 
as
+-- array in second argument) are already registered.
+--
+-- ## \_v.register_patch( TEXT, TEXT[], TEXT[] )
+--
+-- Same as \_v.register_patch( TEXT, TEXT[] ), but also checks if there are no 
conflicts with preexisting patches.
+--
+-- Third argument is array of names of patches that conflict with current one. 
So
+-- if any of them is installed - register_patch will error out.
+--
+-- ## \_v.unregister_patch( TEXT )
+--
+-- Removes information about given patch from the versioning data.
+--
+-- It doesn't remove objects that were created by this patch - just removes
+-- metainformation.
+--
+-- ## \_v.assert_user_is_superuser()
+--
+-- Make sure that current patch is being loaded by superuser.
+--
+-- If it's not - it will raise exception, and break transaction.
+--
+-- ## \_v.assert_user_is_not_superuser()
+--
+-- Make sure that current patch is not being loaded by superuser.
+--
+-- If it is - it will raise exception, and break transaction.
+--
+-- ## \_v.assert_user_is_one_of(TEXT, TEXT, ... )
+--
+-- Make sure that current patch is being loaded by one of listed users.
+--
+-- If ```current_user``` is not listed as one of arguments - function will 
raise
+-- exception and break the transaction.
+
+BEGIN;
+
+-- This file adds versioning support to database it will be loaded to.
+-- It requires that PL/pgSQL is already loaded - will raise exception 
otherwise.
+-- All versioning "stuff" (tables, functions) is in "_v" schema.
+
+-- All functions are defined as 'RETURNS SETOF INT4' to be able to make them 
to RETURN literaly nothing (0 rows).
+-- >> RETURNS VOID<< IS similar, but it still outputs "empty line" in psql 
when calling.
+CREATE SCHEMA IF NOT EXISTS _v;
+COMMENT ON SCHEMA _v IS 'Schema for versioning data and functionality.';
+
+CREATE TABLE IF NOT EXISTS _v.patches (
+    patch_name  TEXT        PRIMARY KEY,
+    applied_tsz TIMESTAMPTZ NOT NULL DEFAULT now(),
+    applied_by  TEXT        NOT NULL,
+    requires    TEXT[],
+    conflicts   TEXT[]
+);
+COMMENT ON TABLE _v.patches              IS 'Contains information about what 
patches are currently applied on database.';
+COMMENT ON COLUMN _v.patches.patch_name  IS 'Name of patch, has to be unique 
for every patch.';
+COMMENT ON COLUMN _v.patches.applied_tsz IS 'When the patch was applied.';
+COMMENT ON COLUMN _v.patches.applied_by  IS 'Who applied this patch 
(PostgreSQL username)';
+COMMENT ON COLUMN _v.patches.requires    IS 'List of patches that are required 
for given patch.';
+COMMENT ON COLUMN _v.patches.conflicts   IS 'List of patches that conflict 
with given patch.';
+
+CREATE OR REPLACE FUNCTION _v.register_patch( IN in_patch_name TEXT, IN 
in_requirements TEXT[], in_conflicts TEXT[], OUT versioning INT4 ) RETURNS 
setof INT4 AS $$
+DECLARE
+    t_text   TEXT;
+    t_text_a TEXT[];
+    i INT4;
+BEGIN
+    -- Thanks to this we know only one patch will be applied at a time
+    LOCK TABLE _v.patches IN EXCLUSIVE MODE;
+
+    SELECT patch_name INTO t_text FROM _v.patches WHERE patch_name = 
in_patch_name;
+    IF FOUND THEN
+        RAISE EXCEPTION 'Patch % is already applied!', in_patch_name;
+    END IF;
+
+    t_text_a := ARRAY( SELECT patch_name FROM _v.patches WHERE patch_name = 
any( in_conflicts ) );
+    IF array_upper( t_text_a, 1 ) IS NOT NULL THEN
+        RAISE EXCEPTION 'Versioning patches conflict. Conflicting patche(s) 
installed: %.', array_to_string( t_text_a, ', ' );
+    END IF;
+
+    IF array_upper( in_requirements, 1 ) IS NOT NULL THEN
+        t_text_a := '{}';
+        FOR i IN array_lower( in_requirements, 1 ) .. array_upper( 
in_requirements, 1 ) LOOP
+            SELECT patch_name INTO t_text FROM _v.patches WHERE patch_name = 
in_requirements[i];
+            IF NOT FOUND THEN
+                t_text_a := t_text_a || in_requirements[i];
+            END IF;
+        END LOOP;
+        IF array_upper( t_text_a, 1 ) IS NOT NULL THEN
+            RAISE EXCEPTION 'Missing prerequisite(s): %.', array_to_string( 
t_text_a, ', ' );
+        END IF;
+    END IF;
+
+    INSERT INTO _v.patches (patch_name, applied_tsz, applied_by, requires, 
conflicts ) VALUES ( in_patch_name, now(), current_user, coalesce( 
in_requirements, '{}' ), coalesce( in_conflicts, '{}' ) );
+    RETURN;
+END;
+$$ language plpgsql;
+COMMENT ON FUNCTION _v.register_patch( TEXT, TEXT[], TEXT[] ) IS 'Function to 
register patches in database. Raises exception if there are conflicts, 
prerequisites are not installed or the migration has already been installed.';
+
+CREATE OR REPLACE FUNCTION _v.register_patch( TEXT, TEXT[] ) RETURNS setof 
INT4 AS $$
+    SELECT _v.register_patch( $1, $2, NULL );
+$$ language sql;
+COMMENT ON FUNCTION _v.register_patch( TEXT, TEXT[] ) IS 'Wrapper to allow 
registration of patches without conflicts.';
+CREATE OR REPLACE FUNCTION _v.register_patch( TEXT ) RETURNS setof INT4 AS $$
+    SELECT _v.register_patch( $1, NULL, NULL );
+$$ language sql;
+COMMENT ON FUNCTION _v.register_patch( TEXT ) IS 'Wrapper to allow 
registration of patches without requirements and conflicts.';
+
+CREATE OR REPLACE FUNCTION _v.unregister_patch( IN in_patch_name TEXT, OUT 
versioning INT4 ) RETURNS setof INT4 AS $$
+DECLARE
+    i        INT4;
+    t_text_a TEXT[];
+BEGIN
+    -- Thanks to this we know only one patch will be applied at a time
+    LOCK TABLE _v.patches IN EXCLUSIVE MODE;
+
+    t_text_a := ARRAY( SELECT patch_name FROM _v.patches WHERE in_patch_name = 
ANY( requires ) );
+    IF array_upper( t_text_a, 1 ) IS NOT NULL THEN
+        RAISE EXCEPTION 'Cannot uninstall %, as it is required by: %.', 
in_patch_name, array_to_string( t_text_a, ', ' );
+    END IF;
+
+    DELETE FROM _v.patches WHERE patch_name = in_patch_name;
+    GET DIAGNOSTICS i = ROW_COUNT;
+    IF i < 1 THEN
+        RAISE EXCEPTION 'Patch % is not installed, so it can''t be 
uninstalled!', in_patch_name;
+    END IF;
+
+    RETURN;
+END;
+$$ language plpgsql;
+COMMENT ON FUNCTION _v.unregister_patch( TEXT ) IS 'Function to unregister 
patches in database. Dies if the patch is not registered, or if unregistering 
it would break dependencies.';
+
+CREATE OR REPLACE FUNCTION _v.assert_patch_is_applied( IN in_patch_name TEXT ) 
RETURNS TEXT as $$
+DECLARE
+    t_text TEXT;
+BEGIN
+    SELECT patch_name INTO t_text FROM _v.patches WHERE patch_name = 
in_patch_name;
+    IF NOT FOUND THEN
+        RAISE EXCEPTION 'Patch % is not applied!', in_patch_name;
+    END IF;
+    RETURN format('Patch %s is applied.', in_patch_name);
+END;
+$$ language plpgsql;
+COMMENT ON FUNCTION _v.assert_patch_is_applied( TEXT ) IS 'Function that can 
be used to make sure that patch has been applied.';
+
+CREATE OR REPLACE FUNCTION _v.assert_user_is_superuser() RETURNS TEXT as $$
+DECLARE
+    v_super bool;
+BEGIN
+    SELECT usesuper INTO v_super FROM pg_user WHERE usename = current_user;
+    IF v_super THEN
+        RETURN 'assert_user_is_superuser: OK';
+    END IF;
+    RAISE EXCEPTION 'Current user is not superuser - cannot continue.';
+END;
+$$ language plpgsql;
+COMMENT ON FUNCTION _v.assert_user_is_superuser() IS 'Function that can be 
used to make sure that patch is being applied using superuser account.';
+
+CREATE OR REPLACE FUNCTION _v.assert_user_is_not_superuser() RETURNS TEXT as $$
+DECLARE
+    v_super bool;
+BEGIN
+    SELECT usesuper INTO v_super FROM pg_user WHERE usename = current_user;
+    IF v_super THEN
+        RAISE EXCEPTION 'Current user is superuser - cannot continue.';
+    END IF;
+    RETURN 'assert_user_is_not_superuser: OK';
+END;
+$$ language plpgsql;
+COMMENT ON FUNCTION _v.assert_user_is_not_superuser() IS 'Function that can be 
used to make sure that patch is being applied using normal (not superuser) 
account.';
+
+CREATE OR REPLACE FUNCTION _v.assert_user_is_one_of(VARIADIC 
p_acceptable_users TEXT[] ) RETURNS TEXT as $$
+DECLARE
+BEGIN
+    IF current_user = any( p_acceptable_users ) THEN
+        RETURN 'assert_user_is_one_of: OK';
+    END IF;
+    RAISE EXCEPTION 'User is not one of: % - cannot continue.', 
p_acceptable_users;
+END;
+$$ language plpgsql;
+COMMENT ON FUNCTION _v.assert_user_is_one_of(TEXT[]) IS 'Function that can be 
used to make sure that patch is being applied by one of defined users.';
+
+COMMIT;
diff --git a/src/backenddb/0001.sql b/src/backenddb/0001.sql
new file mode 100644
index 0000000..98f20a2
--- /dev/null
+++ b/src/backenddb/0001.sql
@@ -0,0 +1,171 @@
+--
+-- This file is part of TALER
+-- Copyright (C) 2014--2020 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('merchant-0001', NULL, NULL);
+
+
+CREATE TABLE IF NOT EXISTS merchant_orders 
+  (order_id VARCHAR NOT NULL
+  ,merchant_pub BYTEA NOT NULL CHECK (LENGTH(merchant_pub)=32)
+  ,contract_terms BYTEA NOT NULL
+  ,timestamp INT8 NOT NULL
+  ,PRIMARY KEY (order_id, merchant_pub)
+  );
+
+-- Offers we made to customers 
+CREATE TABLE IF NOT EXISTS merchant_contract_terms
+   (order_id VARCHAR NOT NULL
+   ,merchant_pub BYTEA NOT NULL CHECK (LENGTH(merchant_pub)=32)
+   ,contract_terms BYTEA NOT NULL
+   ,h_contract_terms BYTEA NOT NULL CHECK (LENGTH(h_contract_terms)=64)
+   ,timestamp INT8 NOT NULL
+   ,row_id BIGSERIAL UNIQUE
+   ,paid boolean DEFAULT FALSE NOT NULL
+   ,PRIMARY KEY (order_id, merchant_pub)
+   ,UNIQUE (h_contract_terms, merchant_pub)
+   );
+
+-- Table with the proofs for each coin we deposited at the exchange 
+CREATE TABLE IF NOT EXISTS merchant_deposits
+  (h_contract_terms BYTEA NOT NULL
+  ,merchant_pub BYTEA NOT NULL CHECK (LENGTH(merchant_pub)=32)
+  ,coin_pub BYTEA NOT NULL CHECK (LENGTH(coin_pub)=32)
+  ,exchange_url VARCHAR NOT NULL
+  ,amount_with_fee_val INT8 NOT NULL
+  ,amount_with_fee_frac INT4 NOT NULL
+  ,deposit_fee_val INT8 NOT NULL
+  ,deposit_fee_frac INT4 NOT NULL
+  ,refund_fee_val INT8 NOT NULL
+  ,refund_fee_frac INT4 NOT NULL
+  ,wire_fee_val INT8 NOT NULL
+  ,wire_fee_frac INT4 NOT NULL
+  ,signkey_pub BYTEA NOT NULL CHECK (LENGTH(signkey_pub)=32)
+  ,exchange_proof BYTEA NOT NULL
+  ,PRIMARY KEY (h_contract_terms, coin_pub)
+  ,FOREIGN KEY (h_contract_terms, merchant_pub) REFERENCES 
merchant_contract_terms (h_contract_terms, merchant_pub)
+  );
+
+CREATE TABLE IF NOT EXISTS merchant_proofs 
+  (exchange_url VARCHAR NOT NULL
+  ,wtid BYTEA CHECK (LENGTH(wtid)=32)
+  ,execution_time INT8 NOT NULL
+  ,signkey_pub BYTEA NOT NULL CHECK (LENGTH(signkey_pub)=32)
+  ,proof BYTEA NOT NULL
+  ,PRIMARY KEY (wtid, exchange_url)
+  );
+  
+-- Note that h_contract_terms + coin_pub may actually be unknown to
+-- us, e.g. someone else deposits something for us at the exchange.
+-- Hence those cannot be foreign keys into deposits/transactions! 
+CREATE TABLE IF NOT EXISTS merchant_transfers
+  (h_contract_terms BYTEA NOT NULL
+  ,coin_pub BYTEA NOT NULL CHECK (LENGTH(coin_pub)=32)
+  ,wtid BYTEA NOT NULL CHECK (LENGTH(wtid)=32)
+  ,PRIMARY KEY (h_contract_terms, coin_pub)
+  );
+CREATE INDEX IF NOT EXISTS merchant_transfers_by_coin
+  ON merchant_transfers
+  (h_contract_terms
+  ,coin_pub);
+CREATE INDEX IF NOT EXISTS merchant_transfers_by_wtid
+  ON merchant_transfers
+  (wtid);
+
+CREATE TABLE IF NOT EXISTS exchange_wire_fees 
+  (exchange_pub BYTEA NOT NULL CHECK (LENGTH(exchange_pub)=32)
+  ,h_wire_method BYTEA NOT NULL CHECK (LENGTH(h_wire_method)=64)
+  ,wire_fee_val INT8 NOT NULL
+  ,wire_fee_frac INT4 NOT NULL
+  ,closing_fee_val INT8 NOT NULL
+  ,closing_fee_frac INT4 NOT NULL
+  ,start_date INT8 NOT NULL
+  ,end_date INT8 NOT NULL
+  ,exchange_sig BYTEA NOT NULL CHECK (LENGTH(exchange_sig)=64)
+  ,PRIMARY KEY (exchange_pub,h_wire_method,start_date,end_date)
+  );
+  
+CREATE TABLE IF NOT EXISTS merchant_refunds
+  (rtransaction_id BIGSERIAL UNIQUE
+  ,merchant_pub BYTEA NOT NULL CHECK (LENGTH(merchant_pub)=32)
+  ,h_contract_terms BYTEA NOT NULL
+  ,coin_pub BYTEA NOT NULL CHECK (LENGTH(coin_pub)=32)
+  ,reason VARCHAR NOT NULL
+  ,refund_amount_val INT8 NOT NULL
+  ,refund_amount_frac INT4 NOT NULL
+  ,refund_fee_val INT8 NOT NULL
+  ,refund_fee_frac INT4 NOT NULL
+  );
+
+-- balances of the reserves available for tips 
+CREATE TABLE IF NOT EXISTS merchant_tip_reserves
+  (reserve_priv BYTEA NOT NULL CHECK (LENGTH(reserve_priv)=32)
+  ,expiration INT8 NOT NULL
+  ,balance_val INT8 NOT NULL
+  ,balance_frac INT4 NOT NULL
+  ,PRIMARY KEY (reserve_priv)
+  );
+  
+-- table where we remember when tipping reserves where established / enabled 
+CREATE TABLE IF NOT EXISTS merchant_tip_reserve_credits
+  (reserve_priv BYTEA NOT NULL CHECK (LENGTH(reserve_priv)=32)
+  ,credit_uuid BYTEA UNIQUE NOT NULL CHECK (LENGTH(credit_uuid)=64)
+  ,timestamp INT8 NOT NULL
+  ,amount_val INT8 NOT NULL
+  ,amount_frac INT4 NOT NULL
+  ,PRIMARY KEY (credit_uuid)
+  );
+
+-- tips that have been authorized 
+CREATE TABLE IF NOT EXISTS merchant_tips 
+  (reserve_priv BYTEA NOT NULL CHECK (LENGTH(reserve_priv)=32)
+  ,tip_id BYTEA NOT NULL CHECK (LENGTH(tip_id)=64)
+  ,exchange_url VARCHAR NOT NULL
+  ,justification VARCHAR NOT NULL
+  ,extra BYTEA NOT NULL
+  ,timestamp INT8 NOT NULL
+  ,amount_val INT8 NOT NULL /* overall tip amount */
+  ,amount_frac INT4 NOT NULL
+  ,left_val INT8 NOT NULL /* tip amount not yet picked up */
+  ,left_frac INT4 NOT NULL
+  ,PRIMARY KEY (tip_id)
+  );
+
+-- tips that have been picked up
+CREATE TABLE IF NOT EXISTS merchant_tip_pickups 
+  (tip_id BYTEA NOT NULL REFERENCES merchant_tips (tip_id) ON DELETE CASCADE
+  ,pickup_id BYTEA NOT NULL CHECK (LENGTH(pickup_id)=64)
+  ,amount_val INT8 NOT NULL
+  ,amount_frac INT4 NOT NULL
+  ,PRIMARY KEY (pickup_id)
+  );
+
+-- sessions and their order_id/fulfillment_url mapping 
+CREATE TABLE IF NOT EXISTS merchant_session_info
+  (session_id VARCHAR NOT NULL
+  ,fulfillment_url VARCHAR NOT NULL
+  ,order_id VARCHAR NOT NULL
+  ,merchant_pub BYTEA NOT NULL CHECK (LENGTH(merchant_pub)=32)
+  ,timestamp INT8 NOT NULL
+  ,PRIMARY KEY (session_id, fulfillment_url, merchant_pub)
+  ,UNIQUE (session_id, fulfillment_url, order_id, merchant_pub)
+  );
+
+-- Complete transaction
+COMMIT;
diff --git a/src/backenddb/Makefile.am b/src/backenddb/Makefile.am
index e374403..eb5e0ae 100644
--- a/src/backenddb/Makefile.am
+++ b/src/backenddb/Makefile.am
@@ -3,6 +3,13 @@ AM_CPPFLAGS = -I$(top_srcdir)/src/include
 
 plugindir = $(libdir)/taler
 
+sqldir = $(prefix)/share/taler/sql/merchant/
+
+sql_DATA = \
+  0000.sql \
+  0001.sql \
+  drop0000.sql
+
 if HAVE_POSTGRESQL
 if HAVE_GNUNETPQ
 plugin_LTLIBRARIES = \
@@ -68,4 +75,5 @@ TESTS = \
   test-merchantdb-postgres
 
 EXTRA_DIST = \
-  test-merchantdb-postgres.conf
+  test-merchantdb-postgres.conf \
+  $(sql_DATA)
diff --git a/src/backenddb/drop0000.sql b/src/backenddb/drop0000.sql
new file mode 100644
index 0000000..32b48da
--- /dev/null
+++ b/src/backenddb/drop0000.sql
@@ -0,0 +1,24 @@
+      "DROP TABLE IF EXISTS merchant_transfers CASCADE;"),
+    GNUNET_PQ_make_try_execute (
+      "DROP TABLE IF EXISTS merchant_deposits CASCADE;"),
+    GNUNET_PQ_make_try_execute (
+      "DROP TABLE IF EXISTS merchant_transactions CASCADE;"),
+    GNUNET_PQ_make_try_execute (
+      "DROP TABLE IF EXISTS merchant_proofs CASCADE;"),
+    GNUNET_PQ_make_try_execute (
+      "DROP TABLE IF EXISTS merchant_contract_terms CASCADE;"),
+    GNUNET_PQ_make_try_execute (
+      "DROP TABLE IF EXISTS merchant_refunds CASCADE;"),
+    GNUNET_PQ_make_try_execute (
+      "DROP TABLE IF EXISTS exchange_wire_fees CASCADE;"),
+    GNUNET_PQ_make_try_execute ("DROP TABLE IF EXISTS merchant_tips CASCADE;"),
+    GNUNET_PQ_make_try_execute (
+      "DROP TABLE IF EXISTS merchant_tip_pickups CASCADE;"),
+    GNUNET_PQ_make_try_execute (
+      "DROP TABLE IF EXISTS merchant_tip_reserve_credits CASCADE;"),
+    GNUNET_PQ_make_try_execute (
+      "DROP TABLE IF EXISTS merchant_tip_reserves CASCADE;"),
+    GNUNET_PQ_make_try_execute (
+      "DROP TABLE IF EXISTS merchant_orders CASCADE;"),
+    GNUNET_PQ_make_try_execute (
+      "DROP TABLE IF EXISTS merchant_session_info CASCADE;"),
diff --git a/src/backenddb/plugin_merchantdb_postgres.c 
b/src/backenddb/plugin_merchantdb_postgres.c
index 89f8d12..0a3ccc9 100644
--- a/src/backenddb/plugin_merchantdb_postgres.c
+++ b/src/backenddb/plugin_merchantdb_postgres.c
@@ -1,6 +1,6 @@
 /*
   This file is part of TALER
-  (C) 2014--2019 Taler Systems SA
+  (C) 2014--2020 Taler Systems SA
 
   TALER is free software; you can redistribute it and/or modify it under the
   terms of the GNU Lesser General Public License as published by the Free 
Software

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