diff --git a/setup.py b/setup.py
index 1d1e5e4..781b2d8 100755
--- a/setup.py
+++ b/setup.py
@@ -1,76 +1,76 @@
 #!/usr/bin/env python3
-# Copyright (C) 2015-2019  The Software Heritage developers
+# Copyright (C) 2015-2022  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 from io import open
 from os import path
 
 from setuptools import find_packages, setup
 
 here = path.abspath(path.dirname(__file__))
 
 # Get the long description from the README file
 with open(path.join(here, "README.md"), encoding="utf-8") as f:
     long_description = f.read()
 
 
 def parse_requirements(*names):
     requirements = []
     for name in names:
         if name:
             reqf = "requirements-%s.txt" % name
         else:
             reqf = "requirements.txt"
 
         if not path.exists(reqf):
             return requirements
 
         with open(reqf) as f:
             for line in f.readlines():
                 line = line.strip()
                 if not line or line.startswith("#"):
                     continue
                 requirements.append(line)
     return requirements
 
 
 setup(
     name="swh.scheduler",
     description="Software Heritage Scheduler",
     long_description=long_description,
     long_description_content_type="text/markdown",
     python_requires=">=3.7",
     author="Software Heritage developers",
     author_email="swh-devel@inria.fr",
     url="https://forge.softwareheritage.org/diffusion/DSCH/",
     packages=find_packages(),
     setup_requires=["setuptools-scm"],
     use_scm_version=True,
     install_requires=parse_requirements(None, "swh"),
     extras_require={
         "testing": parse_requirements("test", "journal", "simulator"),
         "journal": parse_requirements("journal"),
         "simulator": parse_requirements("simulator"),
     },
     include_package_data=True,
     entry_points="""
         [swh.cli.subcommands]
         scheduler=swh.scheduler.cli
         scheduler-journal=swh.scheduler.cli.journal
     """,
     classifiers=[
         "Programming Language :: Python :: 3",
         "Intended Audience :: Developers",
         "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
         "Operating System :: OS Independent",
         "Development Status :: 5 - Production/Stable",
     ],
     project_urls={
         "Bug Reports": "https://forge.softwareheritage.org/maniphest",
         "Funding": "https://www.softwareheritage.org/donate",
         "Source": "https://forge.softwareheritage.org/source/swh-scheduler",
         "Documentation": "https://docs.softwareheritage.org/devel/swh-scheduler/",
     },
 )
diff --git a/swh/scheduler/sql/__init__.py b/swh/scheduler/sql/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/swh/scheduler/sql/upgrades/__init__.py b/swh/scheduler/sql/upgrades/__init__.py
new file mode 100644
index 0000000..e69de29