feat: add unified contest pool and realtime game modes

backend/contest/models.py

@@ -87,6 +87,11 @@ class RealtimeMatch(models.Model):
         COMPLETED = "completed", "已完成"
         CANCELLED = "cancelled", "已取消"
 
+    class GameKind(models.TextChoices):
+        QUIZ = "quiz", "口算竞速"
+        SUDOKU = "sudoku", "数独 Timerun"
+        TWENTY_FOUR = "twenty_four", "24 点竞速"
+
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     contest = models.ForeignKey(Contest, on_delete=models.PROTECT)
     match_type = models.CharField(
@@ -95,6 +100,11 @@ class RealtimeMatch(models.Model):
         default=MatchType.RANDOM,
     )
     challenge_code = models.CharField(max_length=8, unique=True, null=True, blank=True)
+    game_kind = models.CharField(
+        max_length=20,
+        choices=GameKind.choices,
+        default=GameKind.QUIZ,
+    )
     player_one = models.ForeignKey(
         settings.AUTH_USER_MODEL, on_delete=models.PROTECT, related_name="matches_as_player_one"
     )
@@ -126,11 +136,12 @@ class RealtimeMatch(models.Model):
                 fields=(
                     "contest",
                     "match_type",
+                    "game_kind",
                     "status",
                     "player_one_rating",
                     "created_at",
                 ),
-                name="matchmaking_lookup_idx",
+                name="matchmaking_mode_idx",
             )
         ]
 
@@ -152,6 +163,7 @@ class ContestAttempt(models.Model):
     correct_count = models.PositiveIntegerField(default=0)
     answer_count = models.PositiveIntegerField(default=0)
     duration_ms = models.PositiveIntegerField(default=0)
+    question_order = models.JSONField(default=list, blank=True)
     submission_key = models.CharField(max_length=80, null=True, blank=True)
     started_at = models.DateTimeField(auto_now_add=True)
     submitted_at = models.DateTimeField(null=True, blank=True)
@@ -232,6 +244,13 @@ class MathGameAttempt(models.Model):
         on_delete=models.CASCADE,
         related_name="math_game_attempts",
     )
+    match = models.ForeignKey(
+        RealtimeMatch,
+        null=True,
+        blank=True,
+        on_delete=models.PROTECT,
+        related_name="game_attempts",
+    )
     kind = models.CharField(max_length=20, choices=Kind.choices)
     difficulty = models.CharField(
         max_length=16,
@@ -254,7 +273,11 @@ class MathGameAttempt(models.Model):
             models.UniqueConstraint(
                 fields=("user", "submission_key"),
                 name="unique_user_math_game_submission",
-            )
+            ),
+            models.UniqueConstraint(
+                fields=("match", "user"),
+                name="unique_user_realtime_math_game",
+            ),
         ]
         indexes = [
             models.Index(