Changes to the data model.

* Added bookmarks.{last_used,play_time_ms}.
* Removed playlists.mod_count
* Added tags.description.

core/src/main/sql/migrations/20151209054632-initial-schema-up.sql

@@ -44,25 +44,26 @@ CREATE TABLE albums_media_files (
 
 CREATE TABLE tags (
   id SERIAL PRIMARY KEY,
-  name VARCHAR UNIQUE NOT NULL
+  name VARCHAR UNIQUE NOT NULL,
+  description VARCHAR NOT NULL DEFAULT ''
 );
 
 CREATE TABLE playlists (
   id SERIAL PRIMARY KEY,
   user_created BOOLEAN NOT NULL DEFAULT FALSE,
-  last_used TIMESTAMP NOT NULL DEFAULT NOW(),
   name VARCHAR NOT NULL,
-  mod_count INTEGER NOT NULL DEFAULT 0,
   media_file_count INTEGER NOT NULL DEFAULT 0,
   copied_from_id INTEGER REFERENCES playlists(id) DEFAULT NULL,
-  created_at TIMESTAMP NOT NULL DEFAULT NOW()
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  last_used TIMESTAMP NOT NULL DEFAULT NOW()
 );
 
 CREATE TABLE playlists_media_files (
   playlist_id INTEGER NOT NULL REFERENCES playlists(id) ON DELETE CASCADE,
   media_file_id INTEGER NOT NULL REFERENCES media_files(id) ON DELETE CASCADE,
   position INTEGER NOT NULL DEFAULT 0,
-  PRIMARY KEY (playlist_id, media_file_id, position)
+  PRIMARY KEY (playlist_id, media_file_id, position),
+  UNIQUE (playlist_id, position)
 );
 
 CREATE TABLE bookmarks (
@@ -72,7 +73,9 @@ CREATE TABLE bookmarks (
   playlist_id INTEGER NOT NULL REFERENCES playlists(id) ON DELETE CASCADE,
   media_file_id INTEGER NOT NULL REFERENCES media_files(id) ON DELETE CASCADE,
   play_index INTEGER NOT NULL,
-  created_at TIMESTAMP NOT NULL DEFAULT NOW()
+  play_time_ms INTEGER NOT NULL DEFAULT 0,
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  last_used TIMESTAMP NOT NULL DEFAULT NOW()
 );
 
 CREATE INDEX bookmarks_playlist_id_idx ON bookmarks (playlist_id);