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postgres row expiration

By Vast VultureVast Vulture on Apr 03, 2020
CREATE TABLE expire_table (
    timestamp timestamp NOT NULL DEFAULT NOW(),
    name TEXT NOT NULL

INSERT INTO expire_table (name) VALUES ('a');
INSERT INTO expire_table (name) VALUES ('b');
INSERT INTO expire_table (name) VALUES ('c');

select * from expire_table;
         timestamp          | name 
 2014-09-26 15:33:43.243356 | a
 2014-09-26 15:33:45.222202 | b
 2014-09-26 15:33:47.347131 | c
(3 rows)

CREATE FUNCTION expire_table_delete_old_rows() RETURNS trigger
    LANGUAGE plpgsql
    AS $$
  DELETE FROM expire_table WHERE timestamp < NOW() - INTERVAL '1 minute';

CREATE TRIGGER expire_table_delete_old_rows_trigger
    AFTER INSERT ON expire_table
    EXECUTE PROCEDURE expire_table_delete_old_rows();

INSERT INTO expire_table (name) VALUES ('d');

select * from expire_table;
         timestamp          | name 
 2014-09-26 15:36:56.132596 | d
(1 row)

Source: stackoverflow.com

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