[PostgresPuzzleList 2/N] Add an index to (name,title) for faster searching

[ewmson]

We add an index to speed up the queries from 100ms to 10ms.

This does make the code slightly less readable, but we should not need to change this often so I think it is fine.

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[stevenhao]

Just merged master, then ran psql < create_puzzles.sql in both staging & production

~/downforacross.com/server/sql(postgres_index_perf ✔) psql -c '\d puzzles'                      
                           Table "public.puzzles"
   Column    |            Type             | Collation | Nullable | Default 
-------------+-----------------------------+-----------+----------+---------
 uid         | text                        |           |          | 
 pid         | text                        |           | not null | 
 is_public   | boolean                     |           |          | 
 uploaded_at | timestamp without time zone |           |          | 
 content     | jsonb                       |           |          | 
Indexes:
    "puzzles_pkey" PRIMARY KEY, btree (pid)
    "puzzle_name_and_title_trigrams" gist (((((content -> 'info'::text) ->> 'title'::text) || ' '::text) || ((content -> 'info'::text) ->> 'author'::text)) gist_trgm_ops)

~/downforacross.com/server/sql(postgres_index_perf ✔) PGDATABASE=production psql -c '\d puzzles'
                           Table "public.puzzles"
   Column    |            Type             | Collation | Nullable | Default 
-------------+-----------------------------+-----------+----------+---------
 uid         | text                        |           |          | 
 pid         | text                        |           | not null | 
 is_public   | boolean                     |           |          | 
 uploaded_at | timestamp without time zone |           |          | 
 content     | jsonb                       |           |          | 
Indexes:
    "puzzles_pkey" PRIMARY KEY, btree (pid)
    "puzzle_name_and_title_trigrams" gist (((((content -> 'info'::text) ->> 'title'::text) || ' '::text) || ((content -> 'info'::text) ->> 'author'::text)) gist_trgm_ops)

[stevenhao]

will deploy change to server after merging https://github.com/downforacross/downforacross.com/pull/153.