Write a function that updates version_actual_period_start with type timestamp. Look for an entry with the condition version_actual_period_end > current_timestamp . the user specifies the desired date, and the previous one, according to the time of the relevance of the record, is updated version_actual_period_end-becomes the same, but 1 second less. Input parameters time, database table name, version_meta_id array. Plpgsql

CREATE OR REPLACE FUNCTION version_replace_period_start(IN _version_meta_id bigint, OUT _time timestamp)
RETURNS timestamp AS
$BODY$
DECLARE
  _version_meta_id_current bigint;
  _version_meta_id_current_time_start timestamp;
  _version_meta_id_current_time_end timestamp;
  _time_end timestamp;
BEGIN
  _version_meta_id_current=
    (select version_meta_id from version_actual_period 
      where version_meta_id=_version_meta_id
      and version_actual_period_end>now());
  _version_meta_id_current_time_start=(
    select version_actual_period_start 
    from version_actual_period 
    where version_meta_id=_version_meta_id_current);
  _version_meta_id_current_time_end=(
    select version_actual_period_end 
    from version_actual_period