diff --git a/chord_drs/models.py b/chord_drs/models.py
index c317d05..edd5a7f 100644
--- a/chord_drs/models.py
+++ b/chord_drs/models.py
@@ -22,13 +22,18 @@
 Base = declarative_base()
 
 
-class DrsMixin:
-    # IDs (PKs) must remain outside the mixin!
+class DrsBlob(Base):
+    __tablename__ = "drs_object"
+
+    id = Column(String, primary_key=True)
+    location = Column(String(500), nullable=False)
+
     created = Column(DateTime, server_default=func.now())
     checksum = Column(String(64), nullable=False)
     size = Column(Integer, default=0)
     name = Column(String(250), nullable=True)
     description = Column(String(1000), nullable=True)
+
     # Permissions/Bento-specific project & dataset tagging for DRS items
     # TODO: Make some of these not nullable in the future:
     project_id = Column(String(64), nullable=True)  # Nullable for backwards-compatibility
@@ -36,13 +41,6 @@ class DrsMixin:
     data_type = Column(String(24), nullable=True)  # NULL if multi-data type or something else
     public = Column(Boolean, default=False, nullable=False)  # If true, the object is accessible by anyone
 
-
-class DrsBlob(Base, DrsMixin):
-    __tablename__ = "drs_object"
-
-    id = Column(String, primary_key=True)
-    location = Column(String(500), nullable=False)
-
     def __init__(self, *args, **kwargs):
         logger = current_app.logger
 
diff --git a/chord_drs/serialization.py b/chord_drs/serialization.py
index 467a49a..72401e6 100644
--- a/chord_drs/serialization.py
+++ b/chord_drs/serialization.py
@@ -7,7 +7,7 @@
 from urllib.parse import urlparse
 
 from .data_sources import DATA_SOURCE_LOCAL, DATA_SOURCE_MINIO
-from .models import DrsMixin, DrsBlob
+from .models import DrsBlob
 from .types import DRSAccessMethodDict, DRSObjectBentoDict, DRSObjectDict
 
 
@@ -24,7 +24,7 @@ def create_drs_uri(object_id: str) -> str:
     return f"drs://{get_drs_host()}/{object_id}"
 
 
-def build_bento_object_json(drs_object: DrsMixin) -> DRSObjectBentoDict:
+def build_bento_object_json(drs_object: DrsBlob) -> DRSObjectBentoDict:
     return {
         "project_id": drs_object.project_id,
         "dataset_id": drs_object.dataset_id,