feat: add persistent badges and admin badge page

app/models.py

@@ -46,6 +46,13 @@ class User(UserMixin, TimestampMixin, db.Model):
         lazy=True,
     )
     subscriptions = db.relationship("PushSubscription", backref="user", lazy=True, cascade="all, delete-orphan")
+    awarded_badges = db.relationship(
+        "UserBadge",
+        backref="user",
+        lazy=True,
+        cascade="all, delete-orphan",
+        order_by="desc(UserBadge.awarded_at)",
+    )
 
     def set_password(self, password: str) -> None:
         self.password_hash = generate_password_hash(password)
@@ -165,3 +172,15 @@ class BadgeDefinition(TimestampMixin, db.Model):
     threshold = db.Column(db.Integer, nullable=False, default=1)
     bonus_points = db.Column(db.Integer, nullable=False, default=0)
     active = db.Column(db.Boolean, nullable=False, default=True)
+
+    user_badges = db.relationship("UserBadge", backref="badge_definition", lazy=True, cascade="all, delete-orphan")
+
+
+class UserBadge(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    user_id = db.Column(db.Integer, db.ForeignKey("user.id"), nullable=False, index=True)
+    badge_definition_id = db.Column(db.Integer, db.ForeignKey("badge_definition.id"), nullable=False, index=True)
+    awarded_at = db.Column(db.DateTime, nullable=False, default=utcnow, index=True)
+    context = db.Column(db.Text, nullable=True)
+
+    __table_args__ = (db.UniqueConstraint("user_id", "badge_definition_id", name="uq_user_badge_once"),)