diff --git a/backend/app/models/models.py b/backend/app/models/models.py
index 1fbb670..ded4770 100755
--- a/backend/app/models/models.py
+++ b/backend/app/models/models.py
@@ -250,10 +250,6 @@ class SpecVersion(Base):
 
     # Relationships
     knowledge_base: Mapped["KnowledgeBase"] = relationship("KnowledgeBase", back_populates="spec_versions")
-    processing_job: Mapped[Optional["ProcessingJob"]] = relationship(
-        "ProcessingJob", back_populates="spec_version",
-        foreign_keys="[SpecVersion.processing_job_id]",
-    )
 
     __table_args__ = (
         UniqueConstraint("knowledge_base_id", "version_number", name="uq_kb_version_number"),
@@ -283,6 +279,6 @@ class ProcessingJob(Base):
     # Relationships
     knowledge_base: Mapped["KnowledgeBase"] = relationship("KnowledgeBase", back_populates="processing_jobs")
     spec_version: Mapped[Optional["SpecVersion"]] = relationship(
-        "SpecVersion", back_populates="processing_job",
-        foreign_keys="[ProcessingJob.spec_version_id]",
+        "SpecVersion",
+        foreign_keys=[spec_version_id],
     )