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

app/models.py

@@ -7,12 +7,22 @@ class Question(Base):
 
     id = Column(Integer, primary_key=True, index=True, autoincrement=True)
     category = Column(String(50), default="harry_potter", index=True)
+    difficulty = Column(String(20), default="medium", index=True)  # easy, medium, hard
+    question_type = Column(String(20), default="text")  # 'text' or 'multiple_choice'
+
+    # German content (default)
     question = Column(Text, nullable=False)
     canonical_answer = Column(String(255), nullable=False)
-    accepted_answers = Column(Text, nullable=True)  # JSON or comma-delimited
-    question_type = Column(String(20), default="text")  # 'text' or 'multiple_choice'
     options = Column(Text, nullable=True)  # JSON list of options for multiple choice
     hint = Column(Text, nullable=True)
+
+    # English content
+    question_en = Column(Text, nullable=True)
+    answer_en = Column(String(255), nullable=True)
+    options_en = Column(Text, nullable=True)  # JSON list of options in English
+    hint_en = Column(Text, nullable=True)
+
+    accepted_answers = Column(Text, nullable=True)  # JSON or comma-delimited
     status = Column(String(30), default="active", index=True)  # active, needs_review, rejected, archived
     submitted_by = Column(String(100), nullable=True)
     sort_order = Column(Integer, default=0)
@@ -29,6 +39,8 @@ class QuizSession(Base):
     question_ids = Column(Text, nullable=False)  # JSON array string: "[1, 2, 3...]"
     attempts_current = Column(Integer, default=0)
     is_finished = Column(Boolean, default=False)
+    lang = Column(String(10), default="de")  # 'de' or 'en'
+    difficulty = Column(String(20), default="all")  # 'all', 'easy', 'medium', 'hard'
     created_at = Column(DateTime, default=datetime.datetime.utcnow)
     finished_at = Column(DateTime, nullable=True)