create SEQUENCE table_id_seq  
START WITH 1  
INCREMENT BY 1  
NO MINVALUE  
NO MAXVALUE  
CACHE 1;

CREATE OR REPLACE FUNCTION "public"."snow_next_id"(OUT "result" int8)  
  RETURNS "pg_catalog"."int8" AS $BODY$  
DECLARE  
   our_epoch bigint := 1314220021721;  
   seq_id bigint;  
   now_millis bigint;  
   shard_id int := 5;  
BEGIN  
   seq_id := nextval('table_id_seq') % 1024;  
   SELECT FLOOR(EXTRACT(EPOCH FROM clock_timestamp()) * 1000) INTO now_millis;  
   result := (now_millis - our_epoch) << 23;  
   result := result | (shard_id << 10);  
   result := result | (seq_id);  
END;  
$BODY$  
  LANGUAGE plpgsql VOLATILE  
  COST 100