sqlc: add album listing/search queries for Subsonic browse (#295)

Adds ListAlbumsAlphaByName, ListAlbumsAlphaByArtist (with sqlc.embed
for the joined artist sort_name), ListAlbumsNewest, ListAlbumsRandom,
ListAlbumsByGenre, and SearchAlbums. Powers getAlbumList2 type filters
and the album facet of search3.

internal/db/queries/albums.sql

@@ -20,3 +20,36 @@ SELECT * FROM albums WHERE artist_id = $1 AND title = $2 LIMIT 1;
 
 -- name: ListAlbumsByArtist :many
 SELECT * FROM albums WHERE artist_id = $1 ORDER BY release_date NULLS LAST, sort_title;
+
+-- name: ListAlbumsAlphaByName :many
+SELECT * FROM albums ORDER BY sort_title LIMIT $1 OFFSET $2;
+
+-- name: ListAlbumsAlphaByArtist :many
+-- Sorted by the owning artist's sort_name. Needed by Subsonic's
+-- alphabeticalByArtist album list type.
+SELECT sqlc.embed(albums), artists.sort_name AS artist_sort_name
+FROM albums
+JOIN artists ON artists.id = albums.artist_id
+ORDER BY artists.sort_name, albums.sort_title
+LIMIT $1 OFFSET $2;
+
+-- name: ListAlbumsNewest :many
+SELECT * FROM albums ORDER BY created_at DESC LIMIT $1 OFFSET $2;
+
+-- name: ListAlbumsRandom :many
+SELECT * FROM albums ORDER BY random() LIMIT $1;
+
+-- name: ListAlbumsByGenre :many
+-- Album "belongs to" a genre if any of its tracks carry that genre.
+SELECT DISTINCT ON (albums.id) albums.*
+FROM albums
+JOIN tracks ON tracks.album_id = albums.id
+WHERE tracks.genre = $1
+ORDER BY albums.id, albums.sort_title
+LIMIT $2 OFFSET $3;
+
+-- name: SearchAlbums :many
+SELECT * FROM albums
+WHERE title ILIKE '%' || $1 || '%'
+ORDER BY sort_title
+LIMIT $2 OFFSET $3;