refactor: make DefaultFieldsMixin compatible with TypeBase (MappedAsDataclass) (#34686)

api/models/base.py

@@ -24,6 +24,8 @@ class TypeBase(MappedAsDataclass, DeclarativeBase):
 
 
 class DefaultFieldsMixin:
+    """Mixin for models that inherit from Base (non-dataclass)."""
+
     id: Mapped[str] = mapped_column(
         StringUUID,
         primary_key=True,
@@ -53,6 +55,42 @@ class DefaultFieldsMixin:
         return f"<{self.__class__.__name__}(id={self.id})>"
 
 
+class DefaultFieldsDCMixin(MappedAsDataclass):
+    """Mixin for models that inherit from TypeBase (MappedAsDataclass)."""
+
+    __abstract__ = True
+
+    id: Mapped[str] = mapped_column(
+        StringUUID,
+        primary_key=True,
+        insert_default=lambda: str(uuidv7()),
+        default_factory=lambda: str(uuidv7()),
+        init=False,
+    )
+
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime,
+        nullable=False,
+        insert_default=naive_utc_now,
+        default_factory=naive_utc_now,
+        init=False,
+        server_default=func.current_timestamp(),
+    )
+
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime,
+        nullable=False,
+        insert_default=naive_utc_now,
+        default_factory=naive_utc_now,
+        init=False,
+        server_default=func.current_timestamp(),
+        onupdate=func.current_timestamp(),
+    )
+
+    def __repr__(self) -> str:
+        return f"<{self.__class__.__name__}(id={self.id})>"
+
+
 def gen_uuidv4_string() -> str:
     """gen_uuidv4_string generate a UUIDv4 string.