diff --git a/agenta-backend/agenta_backend/core/shared/dtos.py b/agenta-backend/agenta_backend/core/shared/dtos.py
index 85c3b303aa..ac7efb69c7 100644
--- a/agenta-backend/agenta_backend/core/shared/dtos.py
+++ b/agenta-backend/agenta_backend/core/shared/dtos.py
@@ -6,7 +6,20 @@
 
 
 class LifecycleDTO(BaseModel):
-    created_at: datetime
+    created_at: Optional[datetime] = None
     updated_at: Optional[datetime] = None
 
     updated_by_id: Optional[UUID] = None
+
+
+class IdentifierDTO(BaseModel):
+    id: UUID
+
+
+class SlugDTO(BaseModel):
+    slug: str
+
+
+class HeaderDTO(BaseModel):
+    name: Optional[str] = None
+    description: Optional[str] = None
diff --git a/agenta-backend/agenta_backend/dbs/postgres/shared/dbas.py b/agenta-backend/agenta_backend/dbs/postgres/shared/dbas.py
index 86d2c15e7f..05b0eb0752 100644
--- a/agenta-backend/agenta_backend/dbs/postgres/shared/dbas.py
+++ b/agenta-backend/agenta_backend/dbs/postgres/shared/dbas.py
@@ -1,4 +1,5 @@
-from sqlalchemy import Column, UUID, TIMESTAMP, func
+from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy import Column, String, UUID, TIMESTAMP, func, Integer
 
 
 class ProjectScopeDBA:
@@ -27,3 +28,36 @@ class LifecycleDBA:
         UUID(as_uuid=True),
         nullable=True,
     )
+
+
+class IdentifierDBA:
+    __abstract__ = True
+
+    id = Column(UUID(as_uuid=True), nullable=False)
+
+
+class SlugDBA:
+    __abstract__ = True
+
+    slug = Column(String, nullable=False)
+
+
+class HeaderDBA:
+    __abstract__ = True
+
+    name = Column(String, nullable=True)
+    description = Column(String, nullable=True)
+
+
+class VersionedDBA:
+    __abstract__ = True
+
+    slug = Column(String, nullable=False)
+    version = Column(Integer, nullable=False)
+    id = Column(UUID(as_uuid=True), nullable=False)
+
+
+class TagsDBA:
+    __abstract__ = True
+
+    tags = Column(JSONB(none_as_null=True), nullable=True)