diff --git a/odoo_repository/models/__init__.py b/odoo_repository/models/__init__.py
index 6c8e744d..b428a870 100644
--- a/odoo_repository/models/__init__.py
+++ b/odoo_repository/models/__init__.py
@@ -1,5 +1,6 @@
 from . import authentication_token
 from . import ssh_key
+from . import odoo_ref_data_mixin
 from . import odoo_author
 from . import odoo_branch
 from . import odoo_license
diff --git a/odoo_repository/models/odoo_module_branch.py b/odoo_repository/models/odoo_module_branch.py
index 2229d0f4..3d68de71 100644
--- a/odoo_repository/models/odoo_module_branch.py
+++ b/odoo_repository/models/odoo_module_branch.py
@@ -18,6 +18,7 @@
 
 class OdooModuleBranch(models.Model):
     _name = "odoo.module.branch"
+    _inherit = "odoo.ref.data.mixin"
     _description = "Odoo Module Branch"
     _order = "repository_sequence, module_name, branch_name"
 
@@ -644,13 +645,13 @@ def _get_module_category_id(self, category_name):
             rec = self.env["odoo.module.category"].search(
                 [("name", "=", category_name)], limit=1
             )
-            if not rec:
-                rec = (
-                    self.env["odoo.module.category"]
-                    .sudo()
-                    .create({"name": category_name})
-                )
-            return rec.id
+            if rec:
+                return rec.id
+            return self._create_ref_data(
+                "odoo.module.category",
+                [("name", "=", category_name)],
+                {"name": category_name},
+            )
         return False
 
     @tools.ormcache("names")
@@ -661,14 +662,14 @@ def _get_author_ids(self, names):
                 names = [name.strip() for name in names.split(",")]
             authors = self.env["odoo.author"].search([("name", "in", names)])
             missing_author_names = set(names) - set(authors.mapped("name"))
-            missing_authors = self.env["odoo.author"]
+            created_ids = []
             if missing_author_names:
-                missing_authors = (
-                    self.env["odoo.author"]
-                    .sudo()
-                    .create([{"name": name} for name in missing_author_names])
+                created_ids = self._create_ref_data_multi(
+                    "odoo.author",
+                    "name",
+                    [{"name": name} for name in missing_author_names],
                 )
-            return (authors | missing_authors).ids
+            return authors.ids + created_ids
         return []
 
     @tools.ormcache("names")
@@ -676,12 +677,14 @@ def _get_maintainer_ids(self, names):
         if names:
             maintainers = self.env["odoo.maintainer"].search([("name", "in", names)])
             missing_maintainer_names = set(names) - set(maintainers.mapped("name"))
-            created = self.env["odoo.maintainer"]
+            created_ids = []
             if missing_maintainer_names:
-                created = created.sudo().create(
-                    [{"name": name} for name in missing_maintainer_names]
+                created_ids = self._create_ref_data_multi(
+                    "odoo.maintainer",
+                    "name",
+                    [{"name": name} for name in missing_maintainer_names],
                 )
-            return (maintainers | created).ids
+            return maintainers.ids + created_ids
         return []
 
     @tools.ormcache("name")
@@ -690,9 +693,11 @@ def _get_dev_status_id(self, name):
             rec = self.env["odoo.module.dev.status"].search(
                 [("name", "=", name)], limit=1
             )
-            if not rec:
-                rec = self.env["odoo.module.dev.status"].sudo().create({"name": name})
-            return rec.id
+            if rec:
+                return rec.id
+            return self._create_ref_data(
+                "odoo.module.dev.status", [("name", "=", name)], {"name": name}
+            )
         return False
 
     @api.model
@@ -759,13 +764,15 @@ def _get_python_dependency_ids(self, packages):
             dependencies = self.env["odoo.python.dependency"].search(
                 [("name", "in", packages)]
             )
-            missing_dependencies = set(packages) - set(dependencies.mapped("name"))
-            created = self.env["odoo.python.dependency"]
-            if missing_dependencies:
-                created = created.sudo().create(
-                    [{"name": package} for package in missing_dependencies]
+            missing_names = set(packages) - set(dependencies.mapped("name"))
+            created_ids = []
+            if missing_names:
+                created_ids = self._create_ref_data_multi(
+                    "odoo.python.dependency",
+                    "name",
+                    [{"name": name} for name in missing_names],
                 )
-            return (dependencies | created).ids
+            return dependencies.ids + created_ids
         return []
 
     @tools.ormcache("license_name")
@@ -773,9 +780,11 @@ def _get_license_id(self, license_name):
         if license_name:
             license_model = self.env["odoo.license"]
             rec = license_model.search([("name", "=", license_name)], limit=1)
-            if not rec:
-                rec = license_model.sudo().create({"name": license_name})
-            return rec.id
+            if rec:
+                return rec.id
+            return self._create_ref_data(
+                "odoo.license", [("name", "=", license_name)], {"name": license_name}
+            )
         return False
 
     def _get_module(self, name):
diff --git a/odoo_repository/models/odoo_ref_data_mixin.py b/odoo_repository/models/odoo_ref_data_mixin.py
new file mode 100644
index 00000000..9b4262e2
--- /dev/null
+++ b/odoo_repository/models/odoo_ref_data_mixin.py
@@ -0,0 +1,84 @@
+# Copyright 2026 ACSONE SA/NV (<https://acsone.eu>)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl)
+
+import threading
+from contextlib import contextmanager
+
+import psycopg2.errors
+
+from odoo import api, models
+
+
+class OdooRefDataMixin(models.AbstractModel):
+    """Shared helpers to safely create reference data cached by ``@tools.ormcache``."""
+
+    _name = "odoo.ref.data.mixin"
+    _description = "Odoo Ref Data Mixin"
+
+    @contextmanager
+    def _ref_data_cursor(self):
+        """Yield the cursor to use for an isolated reference-data creation.
+
+        This method is a context manager that yields a cursor to use for creating
+        reference data in a separate transaction. If the current environment is in
+        test mode, it yields the current cursor instead, since in test mode we
+        don't want to create a new transaction.
+        """
+        in_test_mode = self.env.registry.in_test_mode() or getattr(
+            threading.current_thread(), "testing", False
+        )
+        if in_test_mode:
+            yield self.env.cr
+        else:
+            with self.pool.cursor() as new_cr:
+                yield new_cr
+
+    def _create_ref_data(self, model_name, domain, values):
+        """Create a single get-or-create reference record in its own
+        dedicated, immediately-committed transaction, and return its id.
+
+        ``@tools.ormcache`` is a process-wide cache that is never invalidated
+        by a SQL ROLLBACK. If a newly created record's id were cached from
+        within the caller's (still uncommitted) transaction, and that
+        transaction was later rolled back for an unrelated reason (e.g. a
+        conflicting concurrent queue job), the cache would keep returning an
+        id that no longer exists in the database. Creating and committing the
+        record here, independently of the caller's transaction, guarantees
+        the returned id always stays valid, whatever happens to the caller's
+        job afterwards.
+
+        A concurrent job may create the same record at the same time: the
+        unique SQL constraint on the target model then raises
+        ``UniqueViolation`` for the loser, which simply looks up the row the
+        winner just committed.
+        """
+        with self._ref_data_cursor() as new_cr:
+            env = api.Environment(new_cr, self.env.uid, self.env.context)
+            model = env[model_name].sudo()
+            try:
+                with new_cr.savepoint():
+                    return model.create(values).id
+            except psycopg2.errors.UniqueViolation:
+                return model.search(domain, limit=1).id
+
+    def _create_ref_data_multi(self, model_name, search_field, values_list):
+        """Same as ``_create_ref_data``, but for a batch of records sharing
+        the same natural-key field (e.g. several new authors discovered at
+        once). Each record is created individually, in its own savepoint, so
+        that a conflict on one of them does not abort the creation of the
+        others.
+        """
+        ids = []
+        with self._ref_data_cursor() as new_cr:
+            env = api.Environment(new_cr, self.env.uid, self.env.context)
+            model = env[model_name].sudo()
+            for values in values_list:
+                try:
+                    with new_cr.savepoint():
+                        ids.append(model.create(values).id)
+                except psycopg2.errors.UniqueViolation:
+                    existing = model.search(
+                        [(search_field, "=", values[search_field])], limit=1
+                    )
+                    ids.append(existing.id)
+        return ids
diff --git a/odoo_repository/models/odoo_repository.py b/odoo_repository/models/odoo_repository.py
index 71bbeba1..2118db3e 100644
--- a/odoo_repository/models/odoo_repository.py
+++ b/odoo_repository/models/odoo_repository.py
@@ -25,6 +25,7 @@
 
 class OdooRepository(models.Model):
     _name = "odoo.repository"
+    _inherit = "odoo.ref.data.mixin"
     _description = "Odoo Modules Repository"
     _order = "sequence, display_name"
 
@@ -501,12 +502,18 @@ def _import_data(self, data):
     def _prepare_module_branch_values(self, data):
         # Get branch, repository and technical module
         branch = self.env["odoo.branch"].search([("name", "=", data["branch"])])
-        org = self._get_repository_org(data["repository"]["org"])
-        repository = self._get_repository(
-            org.id, data["repository"]["name"], data["repository"]
+        org_id = self._get_repository_org_id(data["repository"]["org"])
+        repository_id = self._get_repository_id(
+            org_id, data["repository"]["name"], data["repository"]
         )
-        repository_branch = self._get_repository_branch(
-            org.id, repository.id, branch.id, data["repository"]
+        repository_branch_id = self._get_repository_branch_id(
+            org_id, repository_id, branch.id, data["repository"]
+        )
+        # `_get_repository_branch_id` returns a plain id (see `_create_ref_data`
+        # docstring), so browse it here to get a recordset bound to this
+        # transaction's cursor.
+        repository_branch = self.env["odoo.repository.branch"].browse(
+            repository_branch_id
         )
 
         mb_model = self.env["odoo.module.branch"]
@@ -605,21 +612,18 @@ def _post_create_or_update_module_branch(self, rec, values, raw_data):
         """Hook executed after the creation or update of `rec`."""
 
     @tools.ormcache("name")
-    def _get_repository_org(self, name):
+    def _get_repository_org_id(self, name):
         rec = self.env["odoo.repository.org"].search([("name", "=", name)], limit=1)
-        if not rec:
-            rec = self.env["odoo.repository.org"].sudo().create({"name": name})
-        return rec
+        if rec:
+            return rec.id
+        return self._create_ref_data(
+            "odoo.repository.org", [("name", "=", name)], {"name": name}
+        )
 
     @tools.ormcache("org_id", "name")
-    def _get_repository(self, org_id, name, data):
-        rec = self.env["odoo.repository"].search(
-            [
-                ("org_id", "=", org_id),
-                ("name", "=", name),
-            ],
-            limit=1,
-        )
+    def _get_repository_id(self, org_id, name, data):
+        domain = [("org_id", "=", org_id), ("name", "=", name)]
+        rec = self.env["odoo.repository"].search(domain, limit=1)
         values = {
             "org_id": org_id,
             "name": name,
@@ -629,19 +633,16 @@ def _get_repository(self, org_id, name, data):
         }
         if rec:
             rec.sudo().write(values)
-        else:
-            rec = self.env["odoo.repository"].sudo().create(values)
-        return rec
+            return rec.id
+        return self._create_ref_data("odoo.repository", domain, values)
 
     @tools.ormcache("org_id", "repository_id", "branch_id")
-    def _get_repository_branch(self, org_id, repository_id, branch_id, data):
-        rec = self.env["odoo.repository.branch"].search(
-            [
-                ("repository_id", "=", repository_id),
-                ("branch_id", "=", branch_id),
-            ],
-            limit=1,
-        )
+    def _get_repository_branch_id(self, org_id, repository_id, branch_id, data):
+        domain = [
+            ("repository_id", "=", repository_id),
+            ("branch_id", "=", branch_id),
+        ]
+        rec = self.env["odoo.repository.branch"].search(domain, limit=1)
         values = {
             "repository_id": repository_id,
             "branch_id": branch_id,
@@ -649,9 +650,8 @@ def _get_repository_branch(self, org_id, repository_id, branch_id, data):
         }
         if rec:
             rec.sudo().write(values)
-        else:
-            rec = self.env["odoo.repository.branch"].sudo().create(values)
-        return rec
+            return rec.id
+        return self._create_ref_data("odoo.repository.branch", domain, values)
 
     def _get_resource_url(self, branch, path):
         self.ensure_one()
diff --git a/odoo_repository/readme/CONTRIBUTORS.md b/odoo_repository/readme/CONTRIBUTORS.md
index 17752927..e6aa7475 100644
--- a/odoo_repository/readme/CONTRIBUTORS.md
+++ b/odoo_repository/readme/CONTRIBUTORS.md
@@ -1,2 +1,4 @@
 - Camptocamp
   - Sébastien Alix \<seb@usr-src.org\>
+- ACSONE SA/NV
+  - Laurent Mignon \<laurent.mignon@acsone.eu\>