em: recover orphaned ua_target_resources on restart

When the EM-builder creates a ua_target_resource but the subsequent
em_resources.target_resource update is lost (crash, restart), the next
run finds em_resources.target_resource=NULL but ua_target_resources
already holds a record for the same deterministic res_uuid.

The previous code called insert() unconditionally, which triggered a
ConflictRecords exception and aborted the DB transaction. Any query in
the same session after the abort also failed, so em_resources was never
updated — creating an infinite recovery loop that blocked actualization
of all dependent resources.

Fix: check for an existing record by res_uuid before inserting. If
found, link it to em_resources and return so the next iteration can
compare hashes normally.

Author: gmelikov

exordos_core/elements/dm/models.py

@@ -845,6 +845,23 @@ def actualize(self):
                 full_hash=self.full_hash,
                 tracked_at=self.updated_at,
             )
+            orphaned = list(
+                sdk_models.TargetResource.objects.get_all(
+                    filters={"res_uuid": ra_filters.EQ(res_uuid)}
+                )
+            )
+            if orphaned:
+                # Target resource exists in ua_target_resources but
+                # em_resources.target_resource is NULL (update was lost on a
+                # previous run). Recover the link so the next iteration can
+                # compare hashes normally.
+                LOG.warning(
+                    "Target resource %s already exists (orphaned). Recovering link.",
+                    res_uuid,
+                )
+                self.target_resource = orphaned[0]
+                self.update()
+                return
             target_resource.insert()
             self.target_resource = target_resource
             self.update()

pyproject.toml

@@ -22,7 +22,7 @@ dependencies = [
     "oslo.config>=3.22.2,<10.0.0",  # Apache-2.0
     "bjoern>=3.2.2",  # BSD License (BSD-3-Clause)
     "gcl_looper>=1.2.3,<2.0.0",  # Apache-2.0
-    "restalchemy>=15.0.1,<16.0.0",  # Apache-2.0
+    "restalchemy>=15.1.1,<16.0.0",  # Apache-2.0
     "libvirt-python>=11.0.0,<13.0.0",  # GNU Lesser General Public License v2 or later (LGPLv2+)
     "Authlib>=1.3.2,<2.0.0",  # BSD License (BSD-3-Clause)
     "bazooka>=1.3.0,<2.0.0",  # Apache-2.0