diff --git a/halfapi/app.py b/halfapi/app.py
index 1d6920a..920bb9e 100644
--- a/halfapi/app.py
+++ b/halfapi/app.py
@@ -18,11 +18,11 @@ from typing import Any, Awaitable, Callable, MutableMapping
 RequestResponseEndpoint = Callable[ [Request], Awaitable[Response] ]
 
 # hop-generated classes
-from apidb.api.acl_function import AclFunction
-from apidb.api.domain import Domain
-from apidb.api.route import Route
-from apidb.api.view.acl import Acl as AclView
-from apidb.api.view.route import Route as RouteView
+from .models.api.acl_function import AclFunction
+from .models.api.domain import Domain
+from .models.api.route import Route
+from .models.api.view.acl import Acl as AclView
+from .models.api.view.route import Route as RouteView
 
 # module libraries
 from .lib.responses import ForbiddenResponse, NotFoundResponse
diff --git a/halfapi/lib/__pycache__/query.cpython-38.pyc b/halfapi/lib/__pycache__/query.cpython-38.pyc
deleted file mode 100644
index 16dcebd..0000000
Binary files a/halfapi/lib/__pycache__/query.cpython-38.pyc and /dev/null differ
diff --git a/halfapi/lib/__pycache__/responses.cpython-38.pyc b/halfapi/lib/__pycache__/responses.cpython-38.pyc
deleted file mode 100644
index 4a87cbc..0000000
Binary files a/halfapi/lib/__pycache__/responses.cpython-38.pyc and /dev/null differ
diff --git a/models/__init__.py b/models/__init__.py
new file mode 100644
index 0000000..8aaa822
--- /dev/null
+++ b/models/__init__.py
@@ -0,0 +1,11 @@
+"""This file is part of the apidb package. It has been generated by the
+command halfORM. To keep it in sync with your database structure, just rerun
+halfORM.
+
+More information on the half_orm library on https://github.com/collorg/halfORM.
+"""
+
+__all__ = [
+    'api',
+    'db_connector'
+]
diff --git a/models/api.sql b/models/api.sql
new file mode 100644
index 0000000..5b89aaa
--- /dev/null
+++ b/models/api.sql
@@ -0,0 +1,73 @@
+create schema api;
+
+create type verb as enum ('POST', 'GET', 'PUT', 'DELETE');
+
+create table api.version (
+    name text primary key,
+    server cidr not null default '127.0.0.1',
+    port integer not null
+);
+
+create table api.domain (
+    version text references api.version(name),
+    name text,
+    primary key (version, name)
+);
+
+create table api.route (
+    path text, -- relative to /api/<version>/<domain>
+    version text,
+    domain text,
+    primary key (path, domain, version)
+);
+
+alter table api.route add constraint route_domain_fkey foreign key (version, domain) references api.domain(version, name) on update cascade on delete cascade;
+
+create table api.acl_function (
+    name text,
+    description text,
+    version text,
+    domain text,
+    primary key (name, version, domain)
+);
+
+alter table api.acl_function add constraint acl_function_domain_fkey foreign key (version, domain) references api.domain(version, name) on update cascade on delete cascade;
+
+create table api.acl (
+    name text,
+    http_verb verb,
+    path text not null,
+    version text,
+    domain text not null,
+    function text not null,
+    primary key (name, version, domain, function)
+);
+
+alter table api.acl add constraint acl_route_fkey foreign key (path, version, domain) references api.route(path, version, domain) on update cascade on delete cascade;
+alter table api.acl add constraint acl_function_fkey foreign key (function, version, domain) references api.acl_function(name, version, domain) on update cascade on delete cascade;
+
+create schema "api.view";
+
+create view "api.view".route as
+select
+    route.*,
+    version.name,
+    version.server,
+    version.port,
+    '/'::text || route.domain || route.path AS abs_path
+from
+    api.route
+    join api.domain on
+    route.domain = domain.name
+    join api.version on
+    domain.version = version.name;
+
+create view "api.view".acl as
+select
+    acl.*,
+    acl_function.name as acl_function_name,
+    '/'::text || acl.domain || acl.path AS abs_path
+from
+    api.acl
+    join api.acl_function on
+    acl.function = acl_function.name;
diff --git a/models/api/__init__.py b/models/api/__init__.py
new file mode 100644
index 0000000..3fe4bd2
--- /dev/null
+++ b/models/api/__init__.py
@@ -0,0 +1,15 @@
+"""This file is part of the apidb package. It has been generated by the
+command halfORM. To keep it in sync with your database structure, just rerun
+halfORM.
+
+More information on the half_orm library on https://github.com/collorg/halfORM.
+"""
+
+__all__ = [
+    'acl',
+    'acl_function',
+    'domain',
+    'route',
+    'version',
+    'view'
+]
diff --git a/models/api/acl.py b/models/api/acl.py
new file mode 100644
index 0000000..e065fc4
--- /dev/null
+++ b/models/api/acl.py
@@ -0,0 +1,52 @@
+#-*- coding: utf-8 -*-
+# pylint: disable=wrong-import-order
+
+"""The module apidb.api.acl povides the Acl class.
+
+WARNING!
+
+This file is part of the apidb package. It has been generated by the
+command halfORM. To keep it in sync with your database structure, just rerun
+halfORM.
+
+More information on the half_orm library on https://github.com/collorg/halfORM.
+
+
+DO NOT REMOVE OR MODIFY THE LINES BEGINING WITH:
+#>>> PLACE YOUR CODE BELOW...
+#<<< PLACE YOUR CODE ABOVE...
+
+MAKE SURE YOU PLACE YOUR CODE BETWEEN THESE LINES OR AT THE END OF THE FILE.
+halfORM ONLY PRESERVES THE CODE BETWEEN THESE MARKS WHEN IT IS RUN.
+"""
+
+from ..db_connector import base_relation_class
+
+#>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
+
+#<<< PLACE YOUR CODE ABOVE THIS LINE. DO NOT REMOVE THIS LINE!
+
+__RCLS = base_relation_class('api.acl')
+
+class Acl( __RCLS):
+    """
+    __RCLS: <class 'half_orm.relation.Table_ApiApiAcl'>
+    This class allows you to manipulate the data in the PG relation:
+    TABLE: "api"."api"."acl"
+    FIELDS:
+    - name:      (text) PK
+    - http_verb: (verb)
+    - path:      (text) NOT NULL
+    - version:   (text) PK
+    - domain:    (text) PK
+    - function:  (text) PK
+    FOREIGN KEYS:
+    - acl_route_fkey: (path, version, domain)
+     ↳ "api"."api"."route"(path, version, domain)
+    - acl_function_fkey: (function, version, domain)
+     ↳ "api"."api"."acl_function"(name, version, domain)
+    """
+    def __init__(self, **kwargs):
+        super(Acl, self).__init__(**kwargs)
+
+        #>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
diff --git a/models/api/acl_function.py b/models/api/acl_function.py
new file mode 100644
index 0000000..2aecf9d
--- /dev/null
+++ b/models/api/acl_function.py
@@ -0,0 +1,50 @@
+#-*- coding: utf-8 -*-
+# pylint: disable=wrong-import-order
+
+"""The module apidb.api.acl_function povides the AclFunction class.
+
+WARNING!
+
+This file is part of the apidb package. It has been generated by the
+command halfORM. To keep it in sync with your database structure, just rerun
+halfORM.
+
+More information on the half_orm library on https://github.com/collorg/halfORM.
+
+
+DO NOT REMOVE OR MODIFY THE LINES BEGINING WITH:
+#>>> PLACE YOUR CODE BELOW...
+#<<< PLACE YOUR CODE ABOVE...
+
+MAKE SURE YOU PLACE YOUR CODE BETWEEN THESE LINES OR AT THE END OF THE FILE.
+halfORM ONLY PRESERVES THE CODE BETWEEN THESE MARKS WHEN IT IS RUN.
+"""
+
+from ..db_connector import base_relation_class
+
+#>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
+
+#<<< PLACE YOUR CODE ABOVE THIS LINE. DO NOT REMOVE THIS LINE!
+
+__RCLS = base_relation_class('api.acl_function')
+
+class AclFunction( __RCLS):
+    """
+    __RCLS: <class 'half_orm.relation.Table_ApiApiAcl_function'>
+    This class allows you to manipulate the data in the PG relation:
+    TABLE: "api"."api"."acl_function"
+    FIELDS:
+    - name:        (text) PK
+    - description: (text)
+    - version:     (text) PK
+    - domain:      (text) PK
+    FOREIGN KEYS:
+    - _reverse_fkey_api_api_acl_function_version_domain: (name, version, domain)
+     ↳ "api"."api"."acl"(function, version, domain)
+    - acl_function_domain_fkey: (version, domain)
+     ↳ "api"."api"."domain"(version, name)
+    """
+    def __init__(self, **kwargs):
+        super(AclFunction, self).__init__(**kwargs)
+
+        #>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
diff --git a/models/api/domain.py b/models/api/domain.py
new file mode 100644
index 0000000..5896fc5
--- /dev/null
+++ b/models/api/domain.py
@@ -0,0 +1,50 @@
+#-*- coding: utf-8 -*-
+# pylint: disable=wrong-import-order
+
+"""The module apidb.api.domain povides the Domain class.
+
+WARNING!
+
+This file is part of the apidb package. It has been generated by the
+command halfORM. To keep it in sync with your database structure, just rerun
+halfORM.
+
+More information on the half_orm library on https://github.com/collorg/halfORM.
+
+
+DO NOT REMOVE OR MODIFY THE LINES BEGINING WITH:
+#>>> PLACE YOUR CODE BELOW...
+#<<< PLACE YOUR CODE ABOVE...
+
+MAKE SURE YOU PLACE YOUR CODE BETWEEN THESE LINES OR AT THE END OF THE FILE.
+halfORM ONLY PRESERVES THE CODE BETWEEN THESE MARKS WHEN IT IS RUN.
+"""
+
+from ..db_connector import base_relation_class
+
+#>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
+
+#<<< PLACE YOUR CODE ABOVE THIS LINE. DO NOT REMOVE THIS LINE!
+
+__RCLS = base_relation_class('api.domain')
+
+class Domain( __RCLS):
+    """
+    __RCLS: <class 'half_orm.relation.Table_ApiApiDomain'>
+    This class allows you to manipulate the data in the PG relation:
+    TABLE: "api"."api"."domain"
+    FIELDS:
+    - version: (text) PK
+    - name:    (text) PK
+    FOREIGN KEYS:
+    - _reverse_fkey_api_api_acl_function_version_domain: (version, name)
+     ↳ "api"."api"."acl_function"(version, domain)
+    - domain_version_fkey: (version)
+     ↳ "api"."api"."version"(name)
+    - _reverse_fkey_api_api_route_version_domain: (version, name)
+     ↳ "api"."api"."route"(version, domain)
+    """
+    def __init__(self, **kwargs):
+        super(Domain, self).__init__(**kwargs)
+
+        #>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
diff --git a/models/api/route.py b/models/api/route.py
new file mode 100644
index 0000000..596f8f7
--- /dev/null
+++ b/models/api/route.py
@@ -0,0 +1,49 @@
+#-*- coding: utf-8 -*-
+# pylint: disable=wrong-import-order
+
+"""The module apidb.api.route povides the Route class.
+
+WARNING!
+
+This file is part of the apidb package. It has been generated by the
+command halfORM. To keep it in sync with your database structure, just rerun
+halfORM.
+
+More information on the half_orm library on https://github.com/collorg/halfORM.
+
+
+DO NOT REMOVE OR MODIFY THE LINES BEGINING WITH:
+#>>> PLACE YOUR CODE BELOW...
+#<<< PLACE YOUR CODE ABOVE...
+
+MAKE SURE YOU PLACE YOUR CODE BETWEEN THESE LINES OR AT THE END OF THE FILE.
+halfORM ONLY PRESERVES THE CODE BETWEEN THESE MARKS WHEN IT IS RUN.
+"""
+
+from ..db_connector import base_relation_class
+
+#>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
+
+#<<< PLACE YOUR CODE ABOVE THIS LINE. DO NOT REMOVE THIS LINE!
+
+__RCLS = base_relation_class('api.route')
+
+class Route( __RCLS):
+    """
+    __RCLS: <class 'half_orm.relation.Table_ApiApiRoute'>
+    This class allows you to manipulate the data in the PG relation:
+    TABLE: "api"."api"."route"
+    FIELDS:
+    - path:    (text) PK
+    - version: (text) PK
+    - domain:  (text) PK
+    FOREIGN KEYS:
+    - _reverse_fkey_api_api_acl_path_version_domain: (path, version, domain)
+     ↳ "api"."api"."acl"(path, version, domain)
+    - route_domain_fkey: (version, domain)
+     ↳ "api"."api"."domain"(version, name)
+    """
+    def __init__(self, **kwargs):
+        super(Route, self).__init__(**kwargs)
+
+        #>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
diff --git a/models/api/version.py b/models/api/version.py
new file mode 100644
index 0000000..b1a6077
--- /dev/null
+++ b/models/api/version.py
@@ -0,0 +1,47 @@
+#-*- coding: utf-8 -*-
+# pylint: disable=wrong-import-order
+
+"""The module apidb.api.version povides the Version class.
+
+WARNING!
+
+This file is part of the apidb package. It has been generated by the
+command halfORM. To keep it in sync with your database structure, just rerun
+halfORM.
+
+More information on the half_orm library on https://github.com/collorg/halfORM.
+
+
+DO NOT REMOVE OR MODIFY THE LINES BEGINING WITH:
+#>>> PLACE YOUR CODE BELOW...
+#<<< PLACE YOUR CODE ABOVE...
+
+MAKE SURE YOU PLACE YOUR CODE BETWEEN THESE LINES OR AT THE END OF THE FILE.
+halfORM ONLY PRESERVES THE CODE BETWEEN THESE MARKS WHEN IT IS RUN.
+"""
+
+from ..db_connector import base_relation_class
+
+#>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
+
+#<<< PLACE YOUR CODE ABOVE THIS LINE. DO NOT REMOVE THIS LINE!
+
+__RCLS = base_relation_class('api.version')
+
+class Version( __RCLS):
+    """
+    __RCLS: <class 'half_orm.relation.Table_ApiApiVersion'>
+    This class allows you to manipulate the data in the PG relation:
+    TABLE: "api"."api"."version"
+    FIELDS:
+    - name:   (text) PK
+    - server: (cidr) NOT NULL
+    - port:   (int4) NOT NULL
+    FOREIGN KEY:
+    - _reverse_fkey_api_api_domain_version: (name)
+     ↳ "api"."api"."domain"(version)
+    """
+    def __init__(self, **kwargs):
+        super(Version, self).__init__(**kwargs)
+
+        #>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
diff --git a/models/api/view/__init__.py b/models/api/view/__init__.py
new file mode 100644
index 0000000..8a38f03
--- /dev/null
+++ b/models/api/view/__init__.py
@@ -0,0 +1,11 @@
+"""This file is part of the apidb package. It has been generated by the
+command halfORM. To keep it in sync with your database structure, just rerun
+halfORM.
+
+More information on the half_orm library on https://github.com/collorg/halfORM.
+"""
+
+__all__ = [
+    'acl',
+    'route'
+]
diff --git a/models/api/view/acl.py b/models/api/view/acl.py
new file mode 100644
index 0000000..6fced55
--- /dev/null
+++ b/models/api/view/acl.py
@@ -0,0 +1,49 @@
+#-*- coding: utf-8 -*-
+# pylint: disable=wrong-import-order
+
+"""The module apidb.api.view.acl povides the Acl class.
+
+WARNING!
+
+This file is part of the apidb package. It has been generated by the
+command halfORM. To keep it in sync with your database structure, just rerun
+halfORM.
+
+More information on the half_orm library on https://github.com/collorg/halfORM.
+
+
+DO NOT REMOVE OR MODIFY THE LINES BEGINING WITH:
+#>>> PLACE YOUR CODE BELOW...
+#<<< PLACE YOUR CODE ABOVE...
+
+MAKE SURE YOU PLACE YOUR CODE BETWEEN THESE LINES OR AT THE END OF THE FILE.
+halfORM ONLY PRESERVES THE CODE BETWEEN THESE MARKS WHEN IT IS RUN.
+"""
+
+from ...db_connector import base_relation_class
+
+#>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
+
+#<<< PLACE YOUR CODE ABOVE THIS LINE. DO NOT REMOVE THIS LINE!
+
+__RCLS = base_relation_class('api.view.acl')
+
+class Acl( __RCLS):
+    """
+    __RCLS: <class 'half_orm.relation.View_ApiApiviewAcl'>
+    This class allows you to manipulate the data in the PG relation:
+    VIEW: "api"."api.view"."acl"
+    FIELDS:
+    - name:              (text)
+    - http_verb:         (verb)
+    - path:              (text)
+    - version:           (text)
+    - domain:            (text)
+    - function:          (text)
+    - acl_function_name: (text)
+    - abs_path:          (text)
+    """
+    def __init__(self, **kwargs):
+        super(Acl, self).__init__(**kwargs)
+
+        #>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
diff --git a/models/api/view/route.py b/models/api/view/route.py
new file mode 100644
index 0000000..f8d9eab
--- /dev/null
+++ b/models/api/view/route.py
@@ -0,0 +1,48 @@
+#-*- coding: utf-8 -*-
+# pylint: disable=wrong-import-order
+
+"""The module apidb.api.view.route povides the Route class.
+
+WARNING!
+
+This file is part of the apidb package. It has been generated by the
+command halfORM. To keep it in sync with your database structure, just rerun
+halfORM.
+
+More information on the half_orm library on https://github.com/collorg/halfORM.
+
+
+DO NOT REMOVE OR MODIFY THE LINES BEGINING WITH:
+#>>> PLACE YOUR CODE BELOW...
+#<<< PLACE YOUR CODE ABOVE...
+
+MAKE SURE YOU PLACE YOUR CODE BETWEEN THESE LINES OR AT THE END OF THE FILE.
+halfORM ONLY PRESERVES THE CODE BETWEEN THESE MARKS WHEN IT IS RUN.
+"""
+
+from ...db_connector import base_relation_class
+
+#>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
+
+#<<< PLACE YOUR CODE ABOVE THIS LINE. DO NOT REMOVE THIS LINE!
+
+__RCLS = base_relation_class('api.view.route')
+
+class Route( __RCLS):
+    """
+    __RCLS: <class 'half_orm.relation.View_ApiApiviewRoute'>
+    This class allows you to manipulate the data in the PG relation:
+    VIEW: "api"."api.view"."route"
+    FIELDS:
+    - path:     (text)
+    - version:  (text)
+    - domain:   (text)
+    - name:     (text)
+    - server:   (cidr)
+    - port:     (int4)
+    - abs_path: (text)
+    """
+    def __init__(self, **kwargs):
+        super(Route, self).__init__(**kwargs)
+
+        #>>> PLACE YOUR CODE BELLOW THIS LINE. DO NOT REMOVE THIS LINE!
diff --git a/models/db_connector.py b/models/db_connector.py
new file mode 100644
index 0000000..b0d2673
--- /dev/null
+++ b/models/db_connector.py
@@ -0,0 +1,17 @@
+#-*- coding: utf-8 -*-
+
+"""This module exports the fonction base_relation_class which is
+imported by all modules in the package apidb.
+"""
+
+from half_orm.model import Model
+
+__all__ = ['base_relation_class']
+
+MODEL = Model('api', scope=__name__)
+
+def base_relation_class(qrn):
+    """Returns the class corresponding to the QRN (qualified relation name).
+    """
+    cls = MODEL.get_relation_class(qrn)
+    return cls