Certain user queries retrieve a single user using an ORDER BY

For example, I'm seeing a lot of queries like this in pg_stat_activity:

SELECT  "users".* FROM "users" WHERE "users"."id" = $1  ORDER BY "users"."id" DESC LIMIT 1

Since IDs are also unique we can also remove the limit. The difference between such queries is:

gitlabhq_production=# explain analyze select * from users where id = 209240 order by id desc limit 1;
                                                        QUERY PLAN                                                        
--------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=0.00..8.38 rows=1 width=666) (actual time=0.046..0.046 rows=1 loops=1)
   ->  Index Scan using users_pkey on users  (cost=0.00..8.38 rows=1 width=666) (actual time=0.044..0.044 rows=1 loops=1)
         Index Cond: (id = 209240)
 Total runtime: 0.085 ms
(4 rows)

gitlabhq_production=# explain analyze select * from users where id = 209240;
                                                     QUERY PLAN                                                     
--------------------------------------------------------------------------------------------------------------------
 Index Scan using users_pkey on users  (cost=0.00..8.38 rows=1 width=666) (actual time=0.017..0.018 rows=1 loops=1)
   Index Cond: (id = 209240)
 Total runtime: 0.051 ms
(3 rows)

So it's not that big of a deal, but the ORDER BY and LIMIT are simply not needed.