ongeki: card maker config added, small fixes, improved credits

- Changed the credits config to the default 370 instead of 360
- Added `start_date` to the events to show new events
- Fixed Card Maker Gachas to only allow "Select Gacha" once
- Fixed the `get_profile_rating_log` database query

core/data/schema/versions/SDDT_4_rollback.sql

@@ -0,0 +1,2 @@
+ALTER TABLE ongeki_static_events
+DROP COLUMN startDate;

core/data/schema/versions/SDDT_5_upgrade.sql

@@ -0,0 +1,2 @@
+ALTER TABLE ongeki_static_events
+ADD COLUMN startDate TIMESTAMP NOT NULL DEFAULT current_timestamp();