models: add missing foreign key on workflow_uuid of Job

Closes reanahub#210

reana_db/alembic/versions/20231124_1509_ef26a208a3ae_job_foreign_key.py

@@ -0,0 +1,50 @@
+"""Job foreign key.
+
+Revision ID: ef26a208a3ae
+Revises: 126601b69c78
+Create Date: 2023-11-24 15:09:49.671968
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = "ef26a208a3ae"
+down_revision = "126601b69c78"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    """Upgrade to ef26a208a3ae."""
+    op.alter_column(
+        "job",
+        "workflow_uuid",
+        existing_type=postgresql.UUID(),
+        nullable=False,
+        schema="__reana",
+    )
+    op.create_foreign_key(
+        "_job_workflow_uuid_fk",
+        "job",
+        "workflow",
+        ["workflow_uuid"],
+        ["id_"],
+        source_schema="__reana",
+        referent_schema="__reana",
+    )
+
+
+def downgrade():
+    """Downgrade to 126601b69c78."""
+    op.drop_constraint(
+        "_job_workflow_uuid_fk", "job", schema="__reana", type_="foreignkey"
+    )
+    op.alter_column(
+        "job",
+        "workflow_uuid",
+        existing_type=postgresql.UUID(),
+        nullable=True,
+        schema="__reana",
+    )

reana_db/models.py

@@ -813,7 +813,11 @@ class Job(Base, Timestamp):
 
     id_ = Column(UUIDType, primary_key=True, default=generate_uuid)
     backend_job_id = Column(String(256))
-    workflow_uuid = Column(UUIDType)
+    workflow_uuid = Column(
+        UUIDType,
+        ForeignKey("__reana.workflow.id_", name="_job_workflow_uuid_fk"),
+        nullable=False,
+    )
     status = Column(Enum(JobStatus), default=JobStatus.created)
     compute_backend = Column(String(30))
     cvmfs_mounts = Column(Text)