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CREATE UNLOGGED TABLE change_log (
id BIGSERIAL PRIMARY KEY,
table_name TEXT NOT NULL,
row_id TEXT NOT NULL
);
ALTER TABLE change_log
SET (
autovacuum_enabled = FALSE,
toast.autovacuum_enabled = FALSE
);
CREATE
OR REPLACE FUNCTION fn_process_change_log() RETURNS TRIGGER AS $$
DECLARE cur_state enum_switchover_state := 'idle';
BEGIN
SELECT INTO cur_state current_state
FROM switchover_state;
IF cur_state != 'in_progress' THEN RETURN NEW;
END IF;
IF (TG_OP = 'DELETE') THEN
INSERT INTO change_log (table_name, row_id)
VALUES (
TG_TABLE_NAME,
cast(OLD .id AS TEXT)
);
RETURN OLD;
ELSE
INSERT INTO change_log (table_name, row_id)
VALUES (
TG_TABLE_NAME,
cast(NEW .id AS TEXT)
);
RETURN NEW;
END IF;
RETURN NULL;
END;
$$ LANGUAGE 'plpgsql'
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