Add interface package. Start adding auth stuff for refreshing tokens.

migrations/20230816135241_initial.sql

@@ -1,9 +1,9 @@
 CREATE TABLE "tracked_playlist" (
-    rule_id BIGSERIAL NOT NULL PRIMARY KEY,
-    playlist_id UUID,
-    playlist_name VARCHAR(250),
-    playlist_size INT NOT NULL,
-    tracking_user VARCHAR(250),
-    tracking_type VARCHAR(14),
-    reduce_duplication_on VARCHAR(250)
+    rule_id UUID NOT NULL PRIMARY KEY, -- Internal ID
+    playlist_id UUID, -- UUID of the playlist in navidrome
+    playlist_name VARCHAR(250), -- Name of the playlist in navidrome
+    playlist_size INT NOT NULL, -- Max number of tracks to populate
+    tracking_user VARCHAR(250), -- User to track stats for
+    tracking_type VARCHAR(14), -- Matches time period params from listenbrainz
+    reduce_duplication_on VARCHAR(250) -- Allow e.g preferring songs from different albums or artists
 );