Feature: 40 bilingual questions, random 10 game run, difficulty levels, and full i18n support

migrate_v3.py

@@ -0,0 +1,20 @@
+from app.database import engine
+from sqlalchemy import text
+
+def migrate():
+    with engine.connect() as conn:
+        # Questions table
+        conn.execute(text("ALTER TABLE questions ADD COLUMN IF NOT EXISTS difficulty VARCHAR(20) DEFAULT 'medium'"))
+        conn.execute(text("ALTER TABLE questions ADD COLUMN IF NOT EXISTS question_en TEXT NULL"))
+        conn.execute(text("ALTER TABLE questions ADD COLUMN IF NOT EXISTS answer_en VARCHAR(255) NULL"))
+        conn.execute(text("ALTER TABLE questions ADD COLUMN IF NOT EXISTS options_en TEXT NULL"))
+        conn.execute(text("ALTER TABLE questions ADD COLUMN IF NOT EXISTS hint_en TEXT NULL"))
+
+        # Quiz sessions table
+        conn.execute(text("ALTER TABLE quiz_sessions ADD COLUMN IF NOT EXISTS lang VARCHAR(10) DEFAULT 'de'"))
+        conn.execute(text("ALTER TABLE quiz_sessions ADD COLUMN IF NOT EXISTS difficulty VARCHAR(20) DEFAULT 'all'"))
+        conn.commit()
+    print("Migration v3 successful: added difficulty, multilingual columns, and session preferences.")
+
+if __name__ == "__main__":
+    migrate()