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--
-- 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/>
--
CREATE TABLE 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 TEXT 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 work_shards_by_job_name_completed_last_attempt_index
ON work_shards
(job_name
,completed
,last_attempt ASC
);
CREATE INDEX work_shards_by_end_row_index
ON work_shards
(end_row DESC);
CREATE INDEX work_shards_by_rows
ON work_shards
(job_name
,start_row
,end_row);
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