[Enhance][Bug fix] Add log db & log bug

- Add a log database to record all playing scores
- Fix a bug that if an exception is raised before flask app runs, logger will not work well.

latest version/database/init/log_tables.sql

@@ -0,0 +1,25 @@
+create table if not exists cache(key text primary key,
+value text,
+expire_time int
+);
+create table if not exists user_score(user_id int,
+song_id text,
+difficulty int,
+time_played int,
+score int,
+shiny_perfect_count int,
+perfect_count int,
+near_count int,
+miss_count int,
+health int,
+modifier int,
+clear_type int,
+rating real,
+primary key(user_id, song_id, difficulty, time_played)
+);
+
+create index if not exists user_score_1 on user_score (song_id, difficulty);
+create index if not exists user_score_2 on user_score (time_played);
+
+PRAGMA journal_mode = WAL;
+PRAGMA default_cache_size = 4000;