diff --git a/.github/workflows/backend.yml b/.github/workflows/backend.yml
index 4ac7da68..1478643f 100644
--- a/.github/workflows/backend.yml
+++ b/.github/workflows/backend.yml
@@ -6,16 +6,15 @@ defaults:
 
 on:
   push:
-    branches: [ "main" ]
+    branches: ["main"]
     paths:
       - rsconcept/backend/**
       - .github/workflows/backend.yml
   pull_request:
-    branches: [ "main" ]
+    branches: ["main"]
 
 jobs:
   build:
-
     runs-on: ubuntu-22.04
     strategy:
       max-parallel: 4
@@ -23,21 +22,21 @@ jobs:
         python-version: [3.12]
 
     steps:
-    - uses: actions/checkout@v4
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v5
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install Dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install -r requirements-dev.txt
-    - name: Lint
-      run: |
-        pylint project apps
-        mypy project apps
-    - name: Run Tests
-      if: '!cancelled()'
-      run: |
-        python manage.py check
-        python manage.py test
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install Dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements-dev-lock.txt
+      - name: Lint
+        run: |
+          pylint project apps
+          mypy project apps
+      - name: Run Tests
+        if: "!cancelled()"
+        run: |
+          python manage.py check
+          python manage.py test
diff --git a/rsconcept/backend/apps/library/admin.py b/rsconcept/backend/apps/library/admin.py
index 24111083..35d34ab7 100644
--- a/rsconcept/backend/apps/library/admin.py
+++ b/rsconcept/backend/apps/library/admin.py
@@ -1,4 +1,5 @@
 ''' Admin view: Library. '''
+from typing import cast
 from django.contrib import admin
 
 from . import models
@@ -23,7 +24,7 @@ class LibraryTemplateAdmin(admin.ModelAdmin):
 
     def alias(self, template: models.LibraryTemplate):
         if template.lib_source:
-            return template.lib_source.alias
+            return cast(models.LibraryItem, template.lib_source).alias
         else:
             return 'N/A'
 
diff --git a/rsconcept/backend/apps/library/migrations/0005_alter_libraryitem_owner.py b/rsconcept/backend/apps/library/migrations/0005_alter_libraryitem_owner.py
new file mode 100644
index 00000000..4d633179
--- /dev/null
+++ b/rsconcept/backend/apps/library/migrations/0005_alter_libraryitem_owner.py
@@ -0,0 +1,21 @@
+# Generated by Django 5.1.1 on 2024-09-12 16:48
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('library', '0004_delete_subscription'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='libraryitem',
+            name='owner',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to=settings.AUTH_USER_MODEL, verbose_name='Владелец'),
+        ),
+    ]
diff --git a/rsconcept/backend/apps/library/models/Editor.py b/rsconcept/backend/apps/library/models/Editor.py
index 7c853815..14a8dab5 100644
--- a/rsconcept/backend/apps/library/models/Editor.py
+++ b/rsconcept/backend/apps/library/models/Editor.py
@@ -9,17 +9,17 @@ from apps.users.models import User
 
 class Editor(Model):
     ''' Editor list. '''
-    item: ForeignKey = ForeignKey(
+    item = ForeignKey(
         verbose_name='Схема',
         to='library.LibraryItem',
         on_delete=CASCADE
     )
-    editor: ForeignKey = ForeignKey(
+    editor = ForeignKey(
         verbose_name='Редактор',
         to=User,
         on_delete=CASCADE
     )
-    time_create: DateTimeField = DateTimeField(
+    time_create = DateTimeField(
         verbose_name='Дата добавления',
         auto_now_add=True
     )
diff --git a/rsconcept/backend/apps/library/models/LibraryItem.py b/rsconcept/backend/apps/library/models/LibraryItem.py
index 9ba22a56..bf0f6082 100644
--- a/rsconcept/backend/apps/library/models/LibraryItem.py
+++ b/rsconcept/backend/apps/library/models/LibraryItem.py
@@ -48,55 +48,56 @@ def validate_location(target: str) -> bool:
 
 class LibraryItem(Model):
     ''' Abstract library item.'''
-    item_type: CharField = CharField(
+    item_type = CharField(
         verbose_name='Тип',
         max_length=50,
         choices=LibraryItemType.choices,
         default=LibraryItemType.RSFORM
     )
-    owner: ForeignKey = ForeignKey(
+    owner = ForeignKey(
         verbose_name='Владелец',
         to=User,
         on_delete=SET_NULL,
+        blank=True,
         null=True
     )
-    title: TextField = TextField(
+    title = TextField(
         verbose_name='Название'
     )
-    alias: CharField = CharField(
+    alias = CharField(
         verbose_name='Шифр',
         max_length=255,
         blank=True
     )
-    comment: TextField = TextField(
+    comment = TextField(
         verbose_name='Комментарий',
         blank=True
     )
-    visible: BooleanField = BooleanField(
+    visible = BooleanField(
         verbose_name='Отображаемая',
         default=True
     )
-    read_only: BooleanField = BooleanField(
+    read_only = BooleanField(
         verbose_name='Запретить редактирование',
         default=False
     )
-    access_policy: CharField = CharField(
+    access_policy = CharField(
         verbose_name='Политика доступа',
         max_length=500,
         choices=AccessPolicy.choices,
         default=AccessPolicy.PUBLIC
     )
-    location: TextField = TextField(
+    location = TextField(
         verbose_name='Расположение',
         max_length=500,
         default=LocationHead.USER
     )
 
-    time_create: DateTimeField = DateTimeField(
+    time_create = DateTimeField(
         verbose_name='Дата создания',
         auto_now_add=True
     )
-    time_update: DateTimeField = DateTimeField(
+    time_update = DateTimeField(
         verbose_name='Дата изменения',
         auto_now=True
     )
@@ -112,11 +113,11 @@ class LibraryItem(Model):
     def get_absolute_url(self):
         return f'/api/library/{self.pk}'
 
-    def editors(self) -> QuerySet[User]:
+    def getQ_editors(self) -> QuerySet[User]:
         ''' Get all Editors of this item. '''
         return User.objects.filter(editor__item=self.pk)
 
-    def versions(self) -> QuerySet[Version]:
+    def getQ_versions(self) -> QuerySet[Version]:
         ''' Get all Versions of this item. '''
         return Version.objects.filter(item=self.pk).order_by('-time_create')
 
diff --git a/rsconcept/backend/apps/library/models/LibraryTemplate.py b/rsconcept/backend/apps/library/models/LibraryTemplate.py
index ca0f2307..07b54374 100644
--- a/rsconcept/backend/apps/library/models/LibraryTemplate.py
+++ b/rsconcept/backend/apps/library/models/LibraryTemplate.py
@@ -4,7 +4,7 @@ from django.db.models import CASCADE, ForeignKey, Model
 
 class LibraryTemplate(Model):
     ''' Template for library items and constituents. '''
-    lib_source: ForeignKey = ForeignKey(
+    lib_source = ForeignKey(
         verbose_name='Источник',
         to='library.LibraryItem',
         on_delete=CASCADE
diff --git a/rsconcept/backend/apps/library/models/Version.py b/rsconcept/backend/apps/library/models/Version.py
index c12f3315..ae3879c9 100644
--- a/rsconcept/backend/apps/library/models/Version.py
+++ b/rsconcept/backend/apps/library/models/Version.py
@@ -12,7 +12,7 @@ from django.db.models import (
 
 class Version(Model):
     ''' Library item version archive. '''
-    item: ForeignKey = ForeignKey(
+    item = ForeignKey(
         verbose_name='Схема',
         to='library.LibraryItem',
         on_delete=CASCADE
@@ -22,14 +22,14 @@ class Version(Model):
         max_length=20,
         blank=False
     )
-    description: TextField = TextField(
+    description = TextField(
         verbose_name='Описание',
         blank=True
     )
-    data: JSONField = JSONField(
+    data = JSONField(
         verbose_name='Содержание'
     )
-    time_create: DateTimeField = DateTimeField(
+    time_create = DateTimeField(
         verbose_name='Дата создания',
         auto_now_add=True
     )
diff --git a/rsconcept/backend/apps/library/serializers/data_access.py b/rsconcept/backend/apps/library/serializers/data_access.py
index b010b09a..726c9d7e 100644
--- a/rsconcept/backend/apps/library/serializers/data_access.py
+++ b/rsconcept/backend/apps/library/serializers/data_access.py
@@ -84,10 +84,10 @@ class LibraryItemDetailsSerializer(serializers.ModelSerializer):
         read_only_fields = ('owner', 'id', 'item_type')
 
     def get_editors(self, instance: LibraryItem) -> list[int]:
-        return list(instance.editors().order_by('pk').values_list('pk', flat=True))
+        return list(instance.getQ_editors().order_by('pk').values_list('pk', flat=True))
 
     def get_versions(self, instance: LibraryItem) -> list:
-        return [VersionInnerSerializer(item).data for item in instance.versions().order_by('pk')]
+        return [VersionInnerSerializer(item).data for item in instance.getQ_versions().order_by('pk')]
 
 
 class UserTargetSerializer(serializers.Serializer):
diff --git a/rsconcept/backend/apps/library/tests/s_models/t_Editor.py b/rsconcept/backend/apps/library/tests/s_models/t_Editor.py
index 779ed9f2..a54b53bf 100644
--- a/rsconcept/backend/apps/library/tests/s_models/t_Editor.py
+++ b/rsconcept/backend/apps/library/tests/s_models/t_Editor.py
@@ -35,64 +35,64 @@ class TestEditor(TestCase):
 
     def test_add_editor(self):
         self.assertTrue(Editor.add(self.item.pk, self.user1.pk))
-        self.assertEqual(self.item.editors().count(), 1)
-        self.assertTrue(self.user1 in list(self.item.editors()))
+        self.assertEqual(self.item.getQ_editors().count(), 1)
+        self.assertTrue(self.user1 in list(self.item.getQ_editors()))
 
         self.assertFalse(Editor.add(self.item.pk, self.user1.pk))
-        self.assertEqual(self.item.editors().count(), 1)
+        self.assertEqual(self.item.getQ_editors().count(), 1)
 
         self.assertTrue(Editor.add(self.item.pk, self.user2.pk))
-        self.assertEqual(self.item.editors().count(), 2)
-        self.assertTrue(self.user1 in self.item.editors())
-        self.assertTrue(self.user2 in self.item.editors())
+        self.assertEqual(self.item.getQ_editors().count(), 2)
+        self.assertTrue(self.user1 in self.item.getQ_editors())
+        self.assertTrue(self.user2 in self.item.getQ_editors())
 
         self.user1.delete()
-        self.assertEqual(self.item.editors().count(), 1)
+        self.assertEqual(self.item.getQ_editors().count(), 1)
 
 
     def test_remove_editor(self):
         self.assertFalse(Editor.remove(self.item.pk, self.user1.pk))
         Editor.add(self.item.pk, self.user1.pk)
         Editor.add(self.item.pk, self.user2.pk)
-        self.assertEqual(self.item.editors().count(), 2)
+        self.assertEqual(self.item.getQ_editors().count(), 2)
 
         self.assertTrue(Editor.remove(self.item.pk, self.user1.pk))
-        self.assertEqual(self.item.editors().count(), 1)
-        self.assertTrue(self.user2 in self.item.editors())
+        self.assertEqual(self.item.getQ_editors().count(), 1)
+        self.assertTrue(self.user2 in self.item.getQ_editors())
 
         self.assertFalse(Editor.remove(self.item.pk, self.user1.pk))
 
 
     def test_set_editors(self):
         Editor.set(self.item.pk, [self.user1.pk])
-        self.assertEqual(list(self.item.editors()), [self.user1])
+        self.assertEqual(list(self.item.getQ_editors()), [self.user1])
 
         Editor.set(self.item.pk, [self.user1.pk, self.user1.pk])
-        self.assertEqual(list(self.item.editors()), [self.user1])
+        self.assertEqual(list(self.item.getQ_editors()), [self.user1])
 
         Editor.set(self.item.pk, [])
-        self.assertEqual(list(self.item.editors()), [])
+        self.assertEqual(list(self.item.getQ_editors()), [])
 
         Editor.set(self.item.pk, [self.user1.pk, self.user2.pk])
-        self.assertEqual(set(self.item.editors()), set([self.user1, self.user2]))
+        self.assertEqual(set(self.item.getQ_editors()), set([self.user1, self.user2]))
 
     def test_set_editors_return_diff(self):
         added, deleted = Editor.set_and_return_diff(self.item.pk, [self.user1.pk])
         self.assertEqual(added, [self.user1.pk])
         self.assertEqual(deleted, [])
-        self.assertEqual(list(self.item.editors()), [self.user1])
+        self.assertEqual(list(self.item.getQ_editors()), [self.user1])
 
         added, deleted = Editor.set_and_return_diff(self.item.pk, [self.user1.pk, self.user1.pk])
         self.assertEqual(added, [])
         self.assertEqual(deleted, [])
-        self.assertEqual(list(self.item.editors()), [self.user1])
+        self.assertEqual(list(self.item.getQ_editors()), [self.user1])
 
         added, deleted = Editor.set_and_return_diff(self.item.pk, [])
         self.assertEqual(added, [])
         self.assertEqual(deleted, [self.user1.pk])
-        self.assertEqual(list(self.item.editors()), [])
+        self.assertEqual(list(self.item.getQ_editors()), [])
 
         added, deleted = Editor.set_and_return_diff(self.item.pk, [self.user1.pk, self.user2.pk])
         self.assertEqual(added, [self.user1.pk, self.user2.pk])
         self.assertEqual(deleted, [])
-        self.assertEqual(set(self.item.editors()), set([self.user1, self.user2]))
+        self.assertEqual(set(self.item.getQ_editors()), set([self.user1, self.user2]))
diff --git a/rsconcept/backend/apps/library/tests/s_views/t_library.py b/rsconcept/backend/apps/library/tests/s_views/t_library.py
index 54863027..32403005 100644
--- a/rsconcept/backend/apps/library/tests/s_views/t_library.py
+++ b/rsconcept/backend/apps/library/tests/s_views/t_library.py
@@ -250,22 +250,22 @@ class TestLibraryViewset(EndpointTester):
         self.executeOK(data=data, item=self.owned.pk)
         self.owned.refresh_from_db()
         self.assertEqual(self.owned.time_update, time_update)
-        self.assertEqual(list(self.owned.editors()), [self.user])
+        self.assertEqual(list(self.owned.getQ_editors()), [self.user])
 
         self.executeOK(data=data)
-        self.assertEqual(list(self.owned.editors()), [self.user])
+        self.assertEqual(list(self.owned.getQ_editors()), [self.user])
 
         data = {'users': [self.user2.pk]}
         self.executeOK(data=data)
-        self.assertEqual(list(self.owned.editors()), [self.user2])
+        self.assertEqual(list(self.owned.getQ_editors()), [self.user2])
 
         data = {'users': []}
         self.executeOK(data=data)
-        self.assertEqual(list(self.owned.editors()), [])
+        self.assertEqual(list(self.owned.getQ_editors()), [])
 
         data = {'users': [self.user2.pk, self.user.pk]}
         self.executeOK(data=data)
-        self.assertEqual(set(self.owned.editors()), set([self.user2, self.user]))
+        self.assertEqual(set(self.owned.getQ_editors()), set([self.user2, self.user]))
 
 
     @decl_endpoint('/api/library/{item}', method='delete')
diff --git a/rsconcept/backend/apps/library/views/library.py b/rsconcept/backend/apps/library/views/library.py
index 129d1ecb..e58d789f 100644
--- a/rsconcept/backend/apps/library/views/library.py
+++ b/rsconcept/backend/apps/library/views/library.py
@@ -157,7 +157,7 @@ class LibraryViewSet(viewsets.ModelViewSet):
 
         clone = deepcopy(item)
         clone.pk = None
-        clone.owner = self.request.user
+        clone.owner = cast(User, self.request.user)
         clone.title = serializer.validated_data['title']
         clone.alias = serializer.validated_data.get('alias', '')
         clone.comment = serializer.validated_data.get('comment', '')
diff --git a/rsconcept/backend/apps/library/views/versions.py b/rsconcept/backend/apps/library/views/versions.py
index 813d1692..1a0a67c5 100644
--- a/rsconcept/backend/apps/library/views/versions.py
+++ b/rsconcept/backend/apps/library/views/versions.py
@@ -44,7 +44,7 @@ class VersionViewset(
     def restore(self, request: Request, pk) -> HttpResponse:
         ''' Restore version data into current item. '''
         version = cast(m.Version, self.get_object())
-        item = cast(m.LibraryItem, version.item)
+        item = version.item
         with transaction.atomic():
             RSFormSerializer(item).restore_from_version(version.data)
         return Response(
diff --git a/rsconcept/backend/apps/oss/migrations/0008_alter_operation_result.py b/rsconcept/backend/apps/oss/migrations/0008_alter_operation_result.py
new file mode 100644
index 00000000..93d81de4
--- /dev/null
+++ b/rsconcept/backend/apps/oss/migrations/0008_alter_operation_result.py
@@ -0,0 +1,20 @@
+# Generated by Django 5.1.1 on 2024-09-12 16:48
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('library', '0005_alter_libraryitem_owner'),
+        ('oss', '0007_argument_order'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='operation',
+            name='result',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='producer', to='library.libraryitem', verbose_name='Связанная КС'),
+        ),
+    ]
diff --git a/rsconcept/backend/apps/oss/models/Argument.py b/rsconcept/backend/apps/oss/models/Argument.py
index 14bd27b7..baa92f7d 100644
--- a/rsconcept/backend/apps/oss/models/Argument.py
+++ b/rsconcept/backend/apps/oss/models/Argument.py
@@ -4,19 +4,19 @@ from django.db.models import CASCADE, ForeignKey, Model, PositiveIntegerField
 
 class Argument(Model):
     ''' Operation Argument.'''
-    operation: ForeignKey = ForeignKey(
+    operation = ForeignKey(
         verbose_name='Операция',
         to='oss.Operation',
         on_delete=CASCADE,
         related_name='arguments'
     )
-    argument: ForeignKey = ForeignKey(
+    argument = ForeignKey(
         verbose_name='Аргумент',
         to='oss.Operation',
         on_delete=CASCADE,
         related_name='descendants'
     )
-    order: PositiveIntegerField = PositiveIntegerField(
+    order = PositiveIntegerField(
         verbose_name='Позиция',
         default=0,
     )
diff --git a/rsconcept/backend/apps/oss/models/Inheritance.py b/rsconcept/backend/apps/oss/models/Inheritance.py
index f6d3c4f8..761fe58f 100644
--- a/rsconcept/backend/apps/oss/models/Inheritance.py
+++ b/rsconcept/backend/apps/oss/models/Inheritance.py
@@ -4,19 +4,19 @@ from django.db.models import CASCADE, ForeignKey, Model
 
 class Inheritance(Model):
     ''' Inheritance links parent and child constituents in synthesis operation.'''
-    operation: ForeignKey = ForeignKey(
+    operation = ForeignKey(
         verbose_name='Операция',
         to='oss.Operation',
         on_delete=CASCADE,
         related_name='inheritances'
     )
-    parent: ForeignKey = ForeignKey(
+    parent = ForeignKey(
         verbose_name='Исходная конституента',
         to='rsform.Constituenta',
         on_delete=CASCADE,
         related_name='as_parent'
     )
-    child: ForeignKey = ForeignKey(
+    child = ForeignKey(
         verbose_name='Наследованная конституента',
         to='rsform.Constituenta',
         on_delete=CASCADE,
diff --git a/rsconcept/backend/apps/oss/models/Operation.py b/rsconcept/backend/apps/oss/models/Operation.py
index 021f50ff..b7562879 100644
--- a/rsconcept/backend/apps/oss/models/Operation.py
+++ b/rsconcept/backend/apps/oss/models/Operation.py
@@ -23,45 +23,46 @@ class OperationType(TextChoices):
 
 class Operation(Model):
     ''' Operational schema Unit.'''
-    oss: ForeignKey = ForeignKey(
+    oss = ForeignKey(
         verbose_name='Схема синтеза',
         to='library.LibraryItem',
         on_delete=CASCADE,
         related_name='operations'
     )
-    operation_type: CharField = CharField(
+    operation_type = CharField(
         verbose_name='Тип',
         max_length=10,
         choices=OperationType.choices,
         default=OperationType.INPUT
     )
-    result: ForeignKey = ForeignKey(
+    result = ForeignKey(
         verbose_name='Связанная КС',
         to='library.LibraryItem',
+        blank=True,
         null=True,
         on_delete=SET_NULL,
         related_name='producer'
     )
 
-    alias: CharField = CharField(
+    alias = CharField(
         verbose_name='Шифр',
         max_length=255,
         blank=True
     )
-    title: TextField = TextField(
+    title = TextField(
         verbose_name='Название',
         blank=True
     )
-    comment: TextField = TextField(
+    comment = TextField(
         verbose_name='Комментарий',
         blank=True
     )
 
-    position_x: FloatField = FloatField(
+    position_x = FloatField(
         verbose_name='Положение по горизонтали',
         default=0
     )
-    position_y: FloatField = FloatField(
+    position_y = FloatField(
         verbose_name='Положение по вертикали',
         default=0
     )
@@ -74,10 +75,10 @@ class Operation(Model):
     def __str__(self) -> str:
         return f'Операция {self.alias}'
 
-    def getArguments(self) -> QuerySet[Argument]:
+    def getQ_arguments(self) -> QuerySet[Argument]:
         ''' Operation arguments. '''
         return Argument.objects.filter(operation=self)
 
-    def getSubstitutions(self) -> QuerySet[Substitution]:
+    def getQ_substitutions(self) -> QuerySet[Substitution]:
         ''' Operation substitutions. '''
         return Substitution.objects.filter(operation=self)
diff --git a/rsconcept/backend/apps/oss/models/OperationSchema.py b/rsconcept/backend/apps/oss/models/OperationSchema.py
index 16195ad3..6ab9fae6 100644
--- a/rsconcept/backend/apps/oss/models/OperationSchema.py
+++ b/rsconcept/backend/apps/oss/models/OperationSchema.py
@@ -121,7 +121,6 @@ class OperationSchema:
 
         operation.result = schema
         if schema is not None:
-            operation.result = schema
             operation.alias = schema.alias
             operation.title = schema.title
             operation.comment = schema.comment
@@ -139,7 +138,7 @@ class OperationSchema:
         processed: list[Operation] = []
         updated: list[Argument] = []
         deleted: list[Argument] = []
-        for current in operation.getArguments():
+        for current in operation.getQ_arguments():
             if current.argument not in arguments:
                 deleted.append(current)
             else:
@@ -172,7 +171,7 @@ class OperationSchema:
         schema = self.cache.get_schema(operation)
         processed: list[dict] = []
         deleted: list[Substitution] = []
-        for current in operation.getSubstitutions():
+        for current in operation.getQ_substitutions():
             subs = [
                 x for x in substitutes
                 if x['original'] == current.original and x['substitution'] == current.substitution
@@ -215,7 +214,7 @@ class OperationSchema:
             access_policy=self.model.access_policy,
             location=self.model.location
         )
-        Editor.set(schema.model.pk, self.model.editors().values_list('pk', flat=True))
+        Editor.set(schema.model.pk, self.model.getQ_editors().values_list('pk', flat=True))
         operation.result = schema.model
         operation.save()
         self.save(update_fields=['time_update'])
@@ -223,10 +222,14 @@ class OperationSchema:
 
     def execute_operation(self, operation: Operation) -> bool:
         ''' Execute target operation. '''
-        schemas: list[LibraryItem] = [arg.argument.result for arg in operation.getArguments().order_by('order')]
-        if None in schemas:
+        schemas = [
+            arg.argument.result
+            for arg in operation.getQ_arguments().order_by('order')
+            if arg.argument.result is not None
+        ]
+        if len(schemas) == 0:
             return False
-        substitutions = operation.getSubstitutions()
+        substitutions = operation.getQ_substitutions()
         receiver = self.create_input(self.cache.operation_by_id[operation.pk])
 
         parents: dict = {}
@@ -284,7 +287,7 @@ class OperationSchema:
         ''' Trigger cascade resolutions when constituenta type is changed. '''
         self.cache.insert_schema(source)
         operation = self.cache.get_operation(source.model.pk)
-        self._cascade_change_cst_type(operation.pk, target.pk, target.cst_type)
+        self._cascade_change_cst_type(operation.pk, target.pk, cast(CstType, target.cst_type))
 
     def after_update_cst(self, source: RSForm, target: Constituenta, data: dict, old_data: dict) -> None:
         ''' Trigger cascade resolutions when constituenta data is changed. '''
@@ -659,7 +662,7 @@ class OperationSchema:
         substitution_id = self.cache.get_inheritor(substitution_cst.pk, operation_id)
         assert substitution_id is not None
         substitution_inheritor = schema.cache.by_id[substitution_id]
-        mapping = {cast(str, substitution_inheritor.alias): new_original}
+        mapping = {substitution_inheritor.alias: new_original}
         self._cascade_partial_mapping(mapping, dependant, operation_id, schema)
 
     def _process_added_substitutions(self, schema: Optional[RSForm], added: list[Substitution]) -> None:
diff --git a/rsconcept/backend/apps/oss/models/Substitution.py b/rsconcept/backend/apps/oss/models/Substitution.py
index e5e39abd..84c54983 100644
--- a/rsconcept/backend/apps/oss/models/Substitution.py
+++ b/rsconcept/backend/apps/oss/models/Substitution.py
@@ -4,19 +4,19 @@ from django.db.models import CASCADE, ForeignKey, Model
 
 class Substitution(Model):
     ''' Substitutions as part of Synthesis operation in OSS.'''
-    operation: ForeignKey = ForeignKey(
+    operation = ForeignKey(
         verbose_name='Операция',
         to='oss.Operation',
         on_delete=CASCADE
     )
 
-    original: ForeignKey = ForeignKey(
+    original = ForeignKey(
         verbose_name='Удаляемая конституента',
         to='rsform.Constituenta',
         on_delete=CASCADE,
         related_name='as_original'
     )
-    substitution: ForeignKey = ForeignKey(
+    substitution = ForeignKey(
         verbose_name='Замещающая конституента',
         to='rsform.Constituenta',
         on_delete=CASCADE,
diff --git a/rsconcept/backend/apps/oss/tests/s_propagation/t_attributes.py b/rsconcept/backend/apps/oss/tests/s_propagation/t_attributes.py
index 36edb98e..c0e81a09 100644
--- a/rsconcept/backend/apps/oss/tests/s_propagation/t_attributes.py
+++ b/rsconcept/backend/apps/oss/tests/s_propagation/t_attributes.py
@@ -53,6 +53,7 @@ class TestChangeAttributes(EndpointTester):
             alias='3',
             operation_type=OperationType.SYNTHESIS
         )
+        self.owned.set_arguments(self.operation3.pk, [self.operation1, self.operation2])
         self.owned.execute_operation(self.operation3)
         self.operation3.refresh_from_db()
         self.ks3 = RSForm(self.operation3.result)
@@ -116,10 +117,10 @@ class TestChangeAttributes(EndpointTester):
         self.ks1.refresh_from_db()
         self.ks2.refresh_from_db()
         self.ks3.refresh_from_db()
-        self.assertEqual(list(self.owned.model.editors()), [self.user3])
-        self.assertEqual(list(self.ks1.model.editors()), [self.user, self.user2])
-        self.assertEqual(list(self.ks2.model.editors()), [])
-        self.assertEqual(set(self.ks3.model.editors()), set([self.user, self.user3]))
+        self.assertEqual(list(self.owned.model.getQ_editors()), [self.user3])
+        self.assertEqual(list(self.ks1.model.getQ_editors()), [self.user, self.user2])
+        self.assertEqual(list(self.ks2.model.getQ_editors()), [])
+        self.assertEqual(set(self.ks3.model.getQ_editors()), set([self.user, self.user3]))
 
     @decl_endpoint('/api/library/{item}', method='patch')
     def test_sync_from_result(self):
diff --git a/rsconcept/backend/apps/oss/tests/s_propagation/t_operations.py b/rsconcept/backend/apps/oss/tests/s_propagation/t_operations.py
index 4492066b..ab1bf053 100644
--- a/rsconcept/backend/apps/oss/tests/s_propagation/t_operations.py
+++ b/rsconcept/backend/apps/oss/tests/s_propagation/t_operations.py
@@ -124,9 +124,9 @@ class TestChangeOperations(EndpointTester):
         self.ks4D1.refresh_from_db()
         self.ks4D2.refresh_from_db()
         self.ks5D4.refresh_from_db()
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 0)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 1)
         self.assertEqual(self.ks4.constituents().count(), 4)
         self.assertEqual(self.ks5.constituents().count(), 6)
@@ -147,9 +147,9 @@ class TestChangeOperations(EndpointTester):
         self.ks5D4.refresh_from_db()
         self.operation2.refresh_from_db()
         self.assertEqual(self.operation2.result, None)
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 0)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 1)
         self.assertEqual(self.ks4.constituents().count(), 4)
         self.assertEqual(self.ks5.constituents().count(), 6)
@@ -181,9 +181,9 @@ class TestChangeOperations(EndpointTester):
         self.operation2.refresh_from_db()
         self.assertEqual(self.operation2.result, ks6.model)
         self.assertEqual(self.operation2.alias, ks6.model.alias)
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 0)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 1)
         self.assertEqual(self.ks4.constituents().count(), 7)
         self.assertEqual(self.ks5.constituents().count(), 9)
@@ -199,9 +199,9 @@ class TestChangeOperations(EndpointTester):
         self.ks5D4.refresh_from_db()
         self.operation1.refresh_from_db()
         self.assertEqual(self.operation1.result, None)
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 0)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 0)
         self.assertEqual(self.ks4.constituents().count(), 4)
         self.assertEqual(self.ks5.constituents().count(), 7)
@@ -220,9 +220,9 @@ class TestChangeOperations(EndpointTester):
         self.executeOK(data=data, item=self.owned_id)
         self.ks4D2.refresh_from_db()
         self.ks5D4.refresh_from_db()
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 0)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 0)
         self.assertEqual(self.ks4.constituents().count(), 4)
         self.assertEqual(self.ks5.constituents().count(), 7)
@@ -241,9 +241,9 @@ class TestChangeOperations(EndpointTester):
         self.executeOK(data=data, item=self.owned_id)
         self.ks4D2.refresh_from_db()
         self.ks5D4.refresh_from_db()
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 0)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 1)
         self.assertEqual(self.ks4.constituents().count(), 6)
         self.assertEqual(self.ks5.constituents().count(), 8)
@@ -275,9 +275,9 @@ class TestChangeOperations(EndpointTester):
         self.executeOK(data=data, item=self.owned_id)
         self.ks4D2.refresh_from_db()
         self.ks5D4.refresh_from_db()
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 2)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 1)
         self.assertEqual(self.ks4.constituents().count(), 5)
         self.assertEqual(self.ks5.constituents().count(), 7)
@@ -300,9 +300,9 @@ class TestChangeOperations(EndpointTester):
         self.executeOK(data=data, item=self.owned_id)
         self.ks4D2.refresh_from_db()
         self.ks5D4.refresh_from_db()
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 0)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 1)
         self.assertEqual(self.ks4.constituents().count(), 4)
         self.assertEqual(self.ks5.constituents().count(), 6)
@@ -313,9 +313,9 @@ class TestChangeOperations(EndpointTester):
         self.executeOK(data=data, item=self.owned_id)
         self.ks4D2.refresh_from_db()
         self.ks5D4.refresh_from_db()
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 0)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 1)
         self.assertEqual(self.ks4.constituents().count(), 7)
         self.assertEqual(self.ks5.constituents().count(), 9)
diff --git a/rsconcept/backend/apps/oss/tests/s_propagation/t_substitutions.py b/rsconcept/backend/apps/oss/tests/s_propagation/t_substitutions.py
index 41cd1533..943e56a6 100644
--- a/rsconcept/backend/apps/oss/tests/s_propagation/t_substitutions.py
+++ b/rsconcept/backend/apps/oss/tests/s_propagation/t_substitutions.py
@@ -125,11 +125,11 @@ class TestChangeSubstitutions(EndpointTester):
         self.ks4D1.refresh_from_db()
         self.ks4D2.refresh_from_db()
         self.ks5D4.refresh_from_db()
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 1)
         self.assertEqual(subs1_2.first().original, self.ks1X2)
         self.assertEqual(subs1_2.first().substitution, self.ks2S1)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 1)
         self.assertEqual(subs3_4.first().original, self.ks4S1)
         self.assertEqual(subs3_4.first().substitution, self.ks3X1)
@@ -147,11 +147,11 @@ class TestChangeSubstitutions(EndpointTester):
         self.ks4D1.refresh_from_db()
         self.ks4D2.refresh_from_db()
         self.ks5D4.refresh_from_db()
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 1)
         self.assertEqual(subs1_2.first().original, self.ks1X1)
         self.assertEqual(subs1_2.first().substitution, self.ks2X1)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 1)
         self.assertEqual(subs3_4.first().original, self.ks4X1)
         self.assertEqual(subs3_4.first().substitution, self.ks3X1)
@@ -165,9 +165,9 @@ class TestChangeSubstitutions(EndpointTester):
         self.executeOK(data=data, schema=self.ks1.model.pk)
         self.ks4D2.refresh_from_db()
         self.ks5D4.refresh_from_db()
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 0)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 1)
         self.assertEqual(self.ks5.constituents().count(), 7)
         self.assertEqual(self.ks4D2.definition_formal, r'X1 X2 X3 S1 DEL')
@@ -180,9 +180,9 @@ class TestChangeSubstitutions(EndpointTester):
         self.ks4D1.refresh_from_db()
         self.ks4D2.refresh_from_db()
         self.ks5D4.refresh_from_db()
-        subs1_2 = self.operation4.getSubstitutions()
+        subs1_2 = self.operation4.getQ_substitutions()
         self.assertEqual(subs1_2.count(), 0)
-        subs3_4 = self.operation5.getSubstitutions()
+        subs3_4 = self.operation5.getQ_substitutions()
         self.assertEqual(subs3_4.count(), 1)
         self.assertEqual(self.ks5.constituents().count(), 7)
         self.assertEqual(self.ks4D1.definition_formal, r'X4 X1')
diff --git a/rsconcept/backend/apps/oss/tests/s_views/t_oss.py b/rsconcept/backend/apps/oss/tests/s_views/t_oss.py
index e39dc221..f019e752 100644
--- a/rsconcept/backend/apps/oss/tests/s_views/t_oss.py
+++ b/rsconcept/backend/apps/oss/tests/s_views/t_oss.py
@@ -244,7 +244,7 @@ class TestOssViewset(EndpointTester):
         self.assertEqual(schema.visible, False)
         self.assertEqual(schema.access_policy, self.owned.model.access_policy)
         self.assertEqual(schema.location, self.owned.model.location)
-        self.assertIn(self.user2, schema.editors())
+        self.assertIn(self.user2, schema.getQ_editors())
 
     @decl_endpoint('/api/oss/{item}/delete-operation', method='patch')
     def test_delete_operation(self):
@@ -409,12 +409,12 @@ class TestOssViewset(EndpointTester):
         self.assertEqual(self.operation3.alias, data['item_data']['alias'])
         self.assertEqual(self.operation3.title, data['item_data']['title'])
         self.assertEqual(self.operation3.comment, data['item_data']['comment'])
-        args = self.operation3.getArguments().order_by('order')
+        args = self.operation3.getQ_arguments().order_by('order')
         self.assertEqual(args[0].argument.pk, data['arguments'][0])
         self.assertEqual(args[0].order, 0)
         self.assertEqual(args[1].argument.pk, data['arguments'][1])
         self.assertEqual(args[1].order, 1)
-        sub = self.operation3.getSubstitutions()[0]
+        sub = self.operation3.getQ_substitutions()[0]
         self.assertEqual(sub.original.pk, data['substitutions'][0]['original'])
         self.assertEqual(sub.substitution.pk, data['substitutions'][0]['substitution'])
 
diff --git a/rsconcept/backend/apps/oss/views/oss.py b/rsconcept/backend/apps/oss/views/oss.py
index dc929b60..4c056540 100644
--- a/rsconcept/backend/apps/oss/views/oss.py
+++ b/rsconcept/backend/apps/oss/views/oss.py
@@ -162,7 +162,7 @@ class OssViewSet(viewsets.GenericViewSet, generics.ListAPIView, generics.Retriev
 
         oss = m.OperationSchema(self.get_object())
         operation = cast(m.Operation, serializer.validated_data['target'])
-        old_schema: Optional[LibraryItem] = operation.result
+        old_schema = operation.result
         with transaction.atomic():
             oss.update_positions(serializer.validated_data['positions'])
             oss.delete_operation(operation.pk, serializer.validated_data['keep_constituents'])
@@ -255,7 +255,7 @@ class OssViewSet(viewsets.GenericViewSet, generics.ListAPIView, generics.Retriev
                         'input': msg.operationInputAlreadyConnected()
                     })
         oss = m.OperationSchema(self.get_object())
-        old_schema: Optional[LibraryItem] = target_operation.result
+        old_schema = target_operation.result
         with transaction.atomic():
             if old_schema is not None:
                 if old_schema.is_synced(oss.model):
@@ -370,10 +370,13 @@ class OssViewSet(viewsets.GenericViewSet, generics.ListAPIView, generics.Retriev
         serializer = CstTargetSerializer(data=request.data)
         serializer.is_valid(raise_exception=True)
         cst = cast(Constituenta, serializer.validated_data['target'])
-        inheritance = m.Inheritance.objects.filter(child=cst)
-        while inheritance.exists():
-            cst = cast(m.Inheritance, inheritance.first()).parent
-            inheritance = m.Inheritance.objects.filter(child=cst)
+        inheritance_query = m.Inheritance.objects.filter(child=cst)
+        while inheritance_query.exists():
+            inheritance = inheritance_query.first()
+            if inheritance is None:
+                break
+            cst = inheritance.parent
+            inheritance_query = m.Inheritance.objects.filter(child=cst)
 
         return Response(
             status=c.HTTP_200_OK,
diff --git a/rsconcept/backend/apps/rsform/models/Constituenta.py b/rsconcept/backend/apps/rsform/models/Constituenta.py
index 9a1058cc..8acffe2f 100644
--- a/rsconcept/backend/apps/rsform/models/Constituenta.py
+++ b/rsconcept/backend/apps/rsform/models/Constituenta.py
@@ -49,56 +49,56 @@ class CstType(TextChoices):
 
 class Constituenta(Model):
     ''' Constituenta is the base unit for every conceptual schema. '''
-    schema: ForeignKey = ForeignKey(
+    schema = ForeignKey(
         verbose_name='Концептуальная схема',
         to='library.LibraryItem',
         on_delete=CASCADE
     )
-    order: PositiveIntegerField = PositiveIntegerField(
+    order = PositiveIntegerField(
         verbose_name='Позиция',
         default=0,
     )
-    alias: CharField = CharField(
+    alias = CharField(
         verbose_name='Имя',
         max_length=8,
         default='undefined'
     )
-    cst_type: CharField = CharField(
+    cst_type = CharField(
         verbose_name='Тип',
         max_length=10,
         choices=CstType.choices,
         default=CstType.BASE
     )
-    convention: TextField = TextField(
+    convention = TextField(
         verbose_name='Комментарий/Конвенция',
         default='',
         blank=True
     )
-    term_raw: TextField = TextField(
+    term_raw = TextField(
         verbose_name='Термин (с отсылками)',
         default='',
         blank=True
     )
-    term_resolved: TextField = TextField(
+    term_resolved = TextField(
         verbose_name='Термин',
         default='',
         blank=True
     )
-    term_forms: JSONField = JSONField(
+    term_forms = JSONField(
         verbose_name='Словоформы',
         default=list
     )
-    definition_formal: TextField = TextField(
+    definition_formal = TextField(
         verbose_name='Родоструктурное определение',
         default='',
         blank=True
     )
-    definition_raw: TextField = TextField(
+    definition_raw = TextField(
         verbose_name='Текстовое определение (с отсылками)',
         default='',
         blank=True
     )
-    definition_resolved: TextField = TextField(
+    definition_resolved = TextField(
         verbose_name='Текстовое определение',
         default='',
         blank=True
diff --git a/rsconcept/backend/apps/rsform/models/RSForm.py b/rsconcept/backend/apps/rsform/models/RSForm.py
index f4c91365..bdc9171f 100644
--- a/rsconcept/backend/apps/rsform/models/RSForm.py
+++ b/rsconcept/backend/apps/rsform/models/RSForm.py
@@ -121,7 +121,7 @@ class RSForm:
             update_list.append(cst)
         Constituenta.objects.bulk_update(update_list, ['definition_resolved'])
 
-    def get_max_index(self, cst_type: CstType) -> int:
+    def get_max_index(self, cst_type: str) -> int:
         ''' Get maximum alias index for specific CstType. '''
         result: int = 0
         cst_list: Iterable[Constituenta] = []
diff --git a/rsconcept/backend/apps/rsform/models/api_RSLanguage.py b/rsconcept/backend/apps/rsform/models/api_RSLanguage.py
index 9968f8a7..32b802d7 100644
--- a/rsconcept/backend/apps/rsform/models/api_RSLanguage.py
+++ b/rsconcept/backend/apps/rsform/models/api_RSLanguage.py
@@ -26,7 +26,7 @@ class TokenType(IntEnum):
     REDUCE = 299
 
 
-def get_type_prefix(cst_type: CstType) -> str:
+def get_type_prefix(cst_type: str) -> str:
     ''' Get alias prefix. '''
     match cst_type:
         case CstType.BASE: return 'X'
@@ -40,7 +40,7 @@ def get_type_prefix(cst_type: CstType) -> str:
     return 'X'
 
 
-def is_basic_concept(cst_type: CstType) -> bool:
+def is_basic_concept(cst_type: str) -> bool:
     ''' Evaluate if CstType is basic concept.'''
     return cst_type in [
         CstType.BASE,
@@ -50,7 +50,7 @@ def is_basic_concept(cst_type: CstType) -> bool:
     ]
 
 
-def is_base_set(cst_type: CstType) -> bool:
+def is_base_set(cst_type: str) -> bool:
     ''' Evaluate if CstType is base set or constant set.'''
     return cst_type in [
         CstType.BASE,
@@ -58,7 +58,7 @@ def is_base_set(cst_type: CstType) -> bool:
     ]
 
 
-def is_functional(cst_type: CstType) -> bool:
+def is_functional(cst_type: str) -> bool:
     ''' Evaluate if CstType is function.'''
     return cst_type in [
         CstType.FUNCTION,
@@ -70,7 +70,7 @@ def guess_type(alias: str) -> CstType:
     ''' Get CstType for alias. '''
     prefix = alias[0]
     for (value, _) in CstType.choices:
-        if prefix == get_type_prefix(cast(CstType, value)):
+        if prefix == get_type_prefix(value):
             return cast(CstType, value)
     return CstType.BASE
 
diff --git a/rsconcept/backend/mypy.ini b/rsconcept/backend/mypy.ini
index 519f4292..3ec11395 100644
--- a/rsconcept/backend/mypy.ini
+++ b/rsconcept/backend/mypy.ini
@@ -4,7 +4,8 @@
 warn_return_any = True
 warn_unused_configs = True
 
-plugins = mypy_django_plugin.main
+plugins = 
+  mypy_django_plugin.main
 
 # Per-module options:
 [mypy.plugins.django-stubs]
diff --git a/rsconcept/backend/requirements-dev-lock.txt b/rsconcept/backend/requirements-dev-lock.txt
new file mode 100644
index 00000000..4e705092
--- /dev/null
+++ b/rsconcept/backend/requirements-dev-lock.txt
@@ -0,0 +1,20 @@
+tzdata==2024.1
+Django==5.1.1
+djangorestframework==3.15.2
+django-cors-headers==4.4.0
+django-filter==24.3
+drf-spectacular==0.27.2
+drf-spectacular-sidecar==2024.7.1
+coreapi==2.3.3
+django-rest-passwordreset==1.4.1
+cctext==0.1.4
+pyconcept==0.1.6
+
+psycopg2-binary==2.9.9
+gunicorn==23.0.0
+
+djangorestframework-stubs==3.15.1
+django-extensions==3.2.3
+mypy==1.11.2
+pylint==3.2.7
+coverage==7.6.1
\ No newline at end of file
diff --git a/rsconcept/backend/requirements.txt b/rsconcept/backend/requirements.txt
index 0e75d5ed..1a11e390 100644
--- a/rsconcept/backend/requirements.txt
+++ b/rsconcept/backend/requirements.txt
@@ -1,5 +1,5 @@
 tzdata==2024.1
-Django==5.1
+Django==5.1.1
 djangorestframework==3.15.2
 django-cors-headers==4.4.0
 django-filter==24.3