v0.2 Preview: Construction Plan.

backend/progression/models.py

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+from django.conf import settings
+from django.db import models
+
+
+class UserPet(models.Model):
+    user = models.OneToOneField(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="pet")
+    name = models.CharField(max_length=40, default="小葫芦")
+    level = models.PositiveIntegerField(default=1)
+    experience = models.PositiveIntegerField(default=0)
+    appearance = models.JSONField(default=dict, blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+
+class UserAbility(models.Model):
+    class Dimension(models.TextChoices):
+        VISION = "vision", "眼光"
+        HUMANITIES = "humanities", "人文"
+        DETECTION = "detection", "侦探"
+        MODELING = "modeling", "建模"
+        CONNECTION = "connection", "联结"
+
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="abilities")
+    dimension = models.CharField(max_length=20, choices=Dimension.choices)
+    level = models.PositiveIntegerField(default=0)
+    fragments = models.PositiveIntegerField(default=0)
+
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(fields=("user", "dimension"), name="unique_user_ability")
+        ]
+
+
+class Card(models.Model):
+    slug = models.SlugField(unique=True)
+    name = models.CharField(max_length=80)
+    mathematician = models.CharField(max_length=80)
+    description = models.TextField()
+    image = models.CharField(max_length=200, blank=True)
+
+    def __str__(self):
+        return self.name
+
+
+class UserCard(models.Model):
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="cards")
+    card = models.ForeignKey(Card, on_delete=models.PROTECT)
+    source = models.CharField(max_length=80)
+    acquired_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(fields=("user", "card"), name="unique_user_card")
+        ]
+
+
+class RewardTransaction(models.Model):
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="rewards")
+    idempotency_key = models.CharField(max_length=100)
+    source = models.CharField(max_length=80)
+    rewards = models.JSONField(default=dict)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(
+                fields=("user", "idempotency_key"), name="unique_user_reward_transaction"
+            )
+        ]