VRFS-117 - added recording genre support

manifest

@@ -26,4 +26,5 @@ add_recording_creator_id.sql
 make_location_nullable.sql
 band_invitations.sql
 image_urls.sql
-max_mind.sql
+max_mind.sql
+recordings_genres.sql

up/recordings_genres.sql

@@ -0,0 +1,7 @@
+-- recording -> genre mapping
+CREATE TABLE recordings_genres (
+    recording_id VARCHAR(64) NOT NULL REFERENCES recordings(id) ON DELETE CASCADE,
+    genre_id VARCHAR(64) NOT NULL REFERENCES genres(id) ON DELETE CASCADE
+);
+
+ALTER TABLE recordings_genres ADD CONSTRAINT recording_genre_uniqkey UNIQUE (recording_id, genre_id);