diff --git a/rsconcept/backend/apps/rsform/admin.py b/rsconcept/backend/apps/rsform/admin.py
index b4d370d6..2d95688e 100644
--- a/rsconcept/backend/apps/rsform/admin.py
+++ b/rsconcept/backend/apps/rsform/admin.py
@@ -8,9 +8,14 @@ class ConstituentaAdmin(admin.ModelAdmin):
     ''' Admin model: Constituenta. '''
 
 
-class Librarydmin(admin.ModelAdmin):
+class LibraryAdmin(admin.ModelAdmin):
     ''' Admin model: LibraryItem. '''
 
 
+class SubscriptionAdmin(admin.ModelAdmin):
+    ''' Admin model: Subscriptions. '''
+
+
 admin.site.register(models.Constituenta, ConstituentaAdmin)
-admin.site.register(models.LibraryItem, Librarydmin)
+admin.site.register(models.LibraryItem, LibraryAdmin)
+admin.site.register(models.Subscription, SubscriptionAdmin)
diff --git a/rsconcept/backend/apps/rsform/migrations/0001_initial.py b/rsconcept/backend/apps/rsform/migrations/0001_initial.py
index 3ab27367..1aff9c2f 100644
--- a/rsconcept/backend/apps/rsform/migrations/0001_initial.py
+++ b/rsconcept/backend/apps/rsform/migrations/0001_initial.py
@@ -1,4 +1,4 @@
-# Generated by Django 4.2.4 on 2023-08-25 12:15
+# Generated by Django 4.2.4 on 2023-08-26 10:09
 
 import apps.rsform.models
 from django.conf import settings
@@ -35,18 +35,6 @@ class Migration(migrations.Migration):
                 'verbose_name_plural': 'Схемы',
             },
         ),
-        migrations.CreateModel(
-            name='Subscription',
-            fields=[
-                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('item', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='rsform.libraryitem', verbose_name='Элемент')),
-                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL, verbose_name='Пользователь')),
-            ],
-            options={
-                'verbose_name': 'Подписки',
-                'verbose_name_plural': 'Подписка',
-            },
-        ),
         migrations.CreateModel(
             name='Constituenta',
             fields=[
@@ -68,4 +56,17 @@ class Migration(migrations.Migration):
                 'verbose_name_plural': 'Конституенты',
             },
         ),
+        migrations.CreateModel(
+            name='Subscription',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('item', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='rsform.libraryitem', verbose_name='Элемент')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL, verbose_name='Пользователь')),
+            ],
+            options={
+                'verbose_name': 'Подписки',
+                'verbose_name_plural': 'Подписка',
+                'unique_together': {('user', 'item')},
+            },
+        ),
     ]
diff --git a/rsconcept/backend/apps/rsform/models.py b/rsconcept/backend/apps/rsform/models.py
index 6fac23de..c631a04c 100644
--- a/rsconcept/backend/apps/rsform/models.py
+++ b/rsconcept/backend/apps/rsform/models.py
@@ -127,6 +127,17 @@ class LibraryItem(Model):
     def get_absolute_url(self):
         return f'/api/library/{self.pk}/'
 
+    def subscribers(self) -> list[User]:
+        ''' Get all subscribers for this item . '''
+        return [s.user for s in Subscription.objects.filter(item=self.pk)]
+
+    @transaction.atomic
+    def save(self, *args, **kwargs):
+        subscribe = not self.pk and self.owner
+        super().save(*args, **kwargs)
+        if subscribe:
+            Subscription.subscribe(user=self.owner, item=self)
+
 
 class Subscription(Model):
     ''' User subscription to library item. '''
@@ -145,10 +156,28 @@ class Subscription(Model):
         ''' Model metadata. '''
         verbose_name = 'Подписки'
         verbose_name_plural = 'Подписка'
+        unique_together = [['user', 'item']]
 
     def __str__(self) -> str:
         return f'{self.user} -> {self.item}'
 
+    @staticmethod
+    def subscribe(user: User, item: LibraryItem) -> bool:
+        ''' Add subscription. '''
+        if Subscription.objects.filter(user=user, item=item).exists():
+            return False
+        Subscription.objects.create(user=user, item=item)
+        return True
+
+    @staticmethod
+    def unsubscribe(user: User, item: LibraryItem) -> bool:
+        ''' Remove subscription. '''
+        sub = Subscription.objects.filter(user=user, item=item)
+        if not sub.exists():
+            return False
+        sub.delete()
+        return True
+
 
 class Constituenta(Model):
     ''' Constituenta is the base unit for every conceptual schema '''
@@ -514,6 +543,7 @@ class PyConceptAdapter:
         result['time_update'] = self.schema.item.time_update
         result['time_create'] = self.schema.item.time_create
         result['is_common'] = self.schema.item.is_common
+        result['is_canonical'] = self.schema.item.is_canonical
         result['owner'] = (self.schema.item.owner.pk if self.schema.item.owner is not None else None)
         for cst_data in result['items']:
             cst = Constituenta.objects.get(pk=cst_data['id'])
@@ -527,6 +557,7 @@ class PyConceptAdapter:
                 'raw': cst.definition_raw,
                 'resolved': cst.definition_resolved,
             }
+        result['subscribers'] = [item.pk for item in self.schema.item.subscribers()]
         return result
 
     def _prepare_request(self) -> dict:
diff --git a/rsconcept/backend/apps/rsform/tests/data/sample-rsform.trs b/rsconcept/backend/apps/rsform/tests/data/sample-rsform.trs
index 3d1c3a47..fb49cdd8 100644
Binary files a/rsconcept/backend/apps/rsform/tests/data/sample-rsform.trs and b/rsconcept/backend/apps/rsform/tests/data/sample-rsform.trs differ
diff --git a/rsconcept/backend/apps/rsform/tests/t_models.py b/rsconcept/backend/apps/rsform/tests/t_models.py
index adb2f612..41970602 100644
--- a/rsconcept/backend/apps/rsform/tests/t_models.py
+++ b/rsconcept/backend/apps/rsform/tests/t_models.py
@@ -5,12 +5,9 @@ from django.db.utils import IntegrityError
 from django.forms import ValidationError
 
 from apps.rsform.models import (
-    RSForm,
-    Constituenta,
-    CstType,
+    RSForm, Constituenta, CstType,
     User,
-    LibraryItem,
-    LibraryItemType
+    LibraryItem, LibraryItemType, Subscription
 )
 
 
@@ -28,7 +25,7 @@ class TestConstituenta(TestCase):
     def test_url(self):
         testStr = 'X1'
         cst = Constituenta.objects.create(alias=testStr, schema=self.schema1, order=1, convention='Test')
-        self.assertEqual(cst.get_absolute_url(), f'/api/constituents/{cst.id}/')
+        self.assertEqual(cst.get_absolute_url(), f'/api/constituents/{cst.id}')
 
     def test_order_not_null(self):
         with self.assertRaises(IntegrityError):
@@ -110,7 +107,39 @@ class TestLibraryItem(TestCase):
         self.assertEqual(item.comment, 'Test comment')
         self.assertEqual(item.is_common, True)
         self.assertEqual(item.is_canonical, True)
+        self.assertTrue(Subscription.objects.filter(user=item.owner, item=item).exists())
 
+    def test_subscribe(self):
+        item = LibraryItem.objects.create(item_type=LibraryItemType.RSFORM, title='Test')
+        self.assertEqual(len(item.subscribers()), 0)
+
+        self.assertTrue(Subscription.subscribe(self.user1, item))
+        self.assertEqual(len(item.subscribers()), 1)
+        self.assertTrue(self.user1 in item.subscribers())
+
+        self.assertFalse(Subscription.subscribe(self.user1, item))
+        self.assertEqual(len(item.subscribers()), 1)
+
+        self.assertTrue(Subscription.subscribe(self.user2, item))
+        self.assertEqual(len(item.subscribers()), 2)
+        self.assertTrue(self.user1 in item.subscribers())
+        self.assertTrue(self.user2 in item.subscribers())
+
+        self.user1.delete()
+        self.assertEqual(len(item.subscribers()), 1)
+
+    def test_unsubscribe(self):
+        item = LibraryItem.objects.create(item_type=LibraryItemType.RSFORM, title='Test')
+        self.assertFalse(Subscription.unsubscribe(self.user1, item))
+        Subscription.subscribe(self.user1, item)
+        Subscription.subscribe(self.user2, item)
+        self.assertEqual(len(item.subscribers()), 2)
+
+        self.assertTrue(Subscription.unsubscribe(self.user1, item))
+        self.assertEqual(len(item.subscribers()), 1)
+        self.assertTrue(self.user2 in item.subscribers())
+
+        self.assertFalse(Subscription.unsubscribe(self.user1, item))
 
 class TestRSForm(TestCase):
     ''' Testing RSForm wrapper. '''
diff --git a/rsconcept/backend/apps/rsform/tests/t_views.py b/rsconcept/backend/apps/rsform/tests/t_views.py
index 1d33fd18..b3d290f3 100644
--- a/rsconcept/backend/apps/rsform/tests/t_views.py
+++ b/rsconcept/backend/apps/rsform/tests/t_views.py
@@ -9,7 +9,7 @@ from rest_framework.exceptions import ErrorDetail
 from cctext import ReferenceType
 
 from apps.users.models import User
-from apps.rsform.models import Syntax, RSForm, Constituenta, CstType, LibraryItem, LibraryItemType
+from apps.rsform.models import Syntax, RSForm, Constituenta, CstType, LibraryItem, LibraryItemType, Subscription
 from apps.rsform.views import (
     convert_to_ascii,
     convert_to_math,
@@ -43,28 +43,28 @@ class TestConstituentaAPI(APITestCase):
             definition_raw='Test1', definition_resolved='Test2')
 
     def test_retrieve(self):
-        response = self.client.get(f'/api/constituents/{self.cst1.id}/')
+        response = self.client.get(f'/api/constituents/{self.cst1.id}')
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.data['alias'], self.cst1.alias)
         self.assertEqual(response.data['convention'], self.cst1.convention)
 
     def test_partial_update(self):
         data = json.dumps({'convention': 'tt'})
-        response = self.client.patch(f'/api/constituents/{self.cst2.id}/', data, content_type='application/json')
+        response = self.client.patch(f'/api/constituents/{self.cst2.id}', data, content_type='application/json')
         self.assertEqual(response.status_code, 403)
 
         self.client.logout()
-        response = self.client.patch(f'/api/constituents/{self.cst1.id}/', data, content_type='application/json')
+        response = self.client.patch(f'/api/constituents/{self.cst1.id}', data, content_type='application/json')
         self.assertEqual(response.status_code, 403)
 
         self.client.force_authenticate(user=self.user)
-        response = self.client.patch(f'/api/constituents/{self.cst1.id}/', data, content_type='application/json')
+        response = self.client.patch(f'/api/constituents/{self.cst1.id}', data, content_type='application/json')
         self.assertEqual(response.status_code, 200)
         self.cst1.refresh_from_db()
         self.assertEqual(response.data['convention'], 'tt')
         self.assertEqual(self.cst1.convention, 'tt')
 
-        response = self.client.patch(f'/api/constituents/{self.cst1.id}/', data, content_type='application/json')
+        response = self.client.patch(f'/api/constituents/{self.cst1.id}', data, content_type='application/json')
         self.assertEqual(response.status_code, 200)
 
     def test_update_resolved_norefs(self):
@@ -72,7 +72,7 @@ class TestConstituentaAPI(APITestCase):
             'term_raw': 'New term',
             'definition_raw': 'New def'
         })
-        response = self.client.patch(f'/api/constituents/{self.cst3.id}/', data, content_type='application/json')
+        response = self.client.patch(f'/api/constituents/{self.cst3.id}', data, content_type='application/json')
         self.assertEqual(response.status_code, 200)
         self.cst3.refresh_from_db()
         self.assertEqual(response.data['term_resolved'], 'New term')
@@ -85,7 +85,7 @@ class TestConstituentaAPI(APITestCase):
             'term_raw': '@{X1|nomn,sing}',
             'definition_raw': '@{X1|nomn,sing} @{X1|sing,datv}'
         })
-        response = self.client.patch(f'/api/constituents/{self.cst3.id}/', data, content_type='application/json')
+        response = self.client.patch(f'/api/constituents/{self.cst3.id}', data, content_type='application/json')
         self.assertEqual(response.status_code, 200)
         self.cst3.refresh_from_db()
         self.assertEqual(self.cst3.term_resolved, self.cst1.term_resolved)
@@ -95,7 +95,7 @@ class TestConstituentaAPI(APITestCase):
 
     def test_readonly_cst_fields(self):
         data = json.dumps({'alias': 'X33', 'order': 10})
-        response = self.client.patch(f'/api/constituents/{self.cst1.id}/', data, content_type='application/json')
+        response = self.client.patch(f'/api/constituents/{self.cst1.id}', data, content_type='application/json')
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.data['alias'], 'X1')
         self.assertEqual(response.data['alias'], self.cst1.alias)
@@ -130,19 +130,19 @@ class TestLibraryViewset(APITestCase):
     def test_create_anonymous(self):
         self.client.logout()
         data = json.dumps({'title': 'Title'})
-        response = self.client.post('/api/library/', data=data, content_type='application/json')
+        response = self.client.post('/api/library', data=data, content_type='application/json')
         self.assertEqual(response.status_code, 403)
 
     def test_create_populate_user(self):
         data = json.dumps({'title': 'Title'})
-        response = self.client.post('/api/library/', data=data, content_type='application/json')
+        response = self.client.post('/api/library', data=data, content_type='application/json')
         self.assertEqual(response.status_code, 201)
         self.assertEqual(response.data['title'], 'Title')
         self.assertEqual(response.data['owner'], self.user.id)
 
     def test_update(self):
         data = json.dumps({'id': self.owned.id, 'title': 'New title'})
-        response = self.client.patch(f'/api/library/{self.owned.id}/',
+        response = self.client.patch(f'/api/library/{self.owned.id}',
                                      data=data, content_type='application/json')
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.data['title'], 'New title')
@@ -150,61 +150,91 @@ class TestLibraryViewset(APITestCase):
 
     def test_update_unowned(self):
         data = json.dumps({'id': self.unowned.id, 'title': 'New title'})
-        response = self.client.patch(f'/api/library/{self.unowned.id}/',
+        response = self.client.patch(f'/api/library/{self.unowned.id}',
                                      data=data, content_type='application/json')
         self.assertEqual(response.status_code, 403)
 
     def test_destroy(self):
-        response = self.client.delete(f'/api/library/{self.owned.id}/')
+        response = self.client.delete(f'/api/library/{self.owned.id}')
         self.assertTrue(response.status_code in [202, 204])
 
     def test_destroy_admin_override(self):
-        response = self.client.delete(f'/api/library/{self.unowned.id}/')
+        response = self.client.delete(f'/api/library/{self.unowned.id}')
         self.assertEqual(response.status_code, 403)
         self.user.is_staff = True
         self.user.save()
-        response = self.client.delete(f'/api/library/{self.unowned.id}/')
+        response = self.client.delete(f'/api/library/{self.unowned.id}')
         self.assertTrue(response.status_code in [202, 204])
 
     def test_claim(self):
-        response = self.client.post(f'/api/library/{self.owned.id}/claim/')
+        response = self.client.post(f'/api/library/{self.owned.id}/claim')
         self.assertEqual(response.status_code, 403)
 
         self.owned.is_common = True
         self.owned.save()
-        response = self.client.post(f'/api/library/{self.owned.id}/claim/')
+        response = self.client.post(f'/api/library/{self.owned.id}/claim')
         self.assertEqual(response.status_code, 304)
 
-        response = self.client.post(f'/api/library/{self.unowned.id}/claim/')
+        response = self.client.post(f'/api/library/{self.unowned.id}/claim')
         self.assertEqual(response.status_code, 403)
 
+        self.assertFalse(self.user in self.unowned.subscribers())
         self.unowned.is_common = True
         self.unowned.save()
-        response = self.client.post(f'/api/library/{self.unowned.id}/claim/')
+        response = self.client.post(f'/api/library/{self.unowned.id}/claim')
         self.assertEqual(response.status_code, 200)
         self.unowned.refresh_from_db()
         self.assertEqual(self.unowned.owner, self.user)
+        self.assertEqual(self.unowned.owner, self.user)
+        self.assertTrue(self.user in self.unowned.subscribers())
 
     def test_claim_anonymous(self):
         self.client.logout()
-        response = self.client.post(f'/api/library/{self.owned.id}/claim/')
+        response = self.client.post(f'/api/library/{self.owned.id}/claim')
         self.assertEqual(response.status_code, 403)
 
     def test_retrieve_common(self):
         self.client.logout()
-        response = self.client.get('/api/library/active/')
+        response = self.client.get('/api/library/active')
         self.assertEqual(response.status_code, 200)
         self.assertTrue(_response_contains(response, self.common))
         self.assertFalse(_response_contains(response, self.unowned))
         self.assertFalse(_response_contains(response, self.owned))
 
     def test_retrieve_owned(self):
-        response = self.client.get('/api/library/active/')
+        response = self.client.get('/api/library/active')
         self.assertEqual(response.status_code, 200)
         self.assertTrue(_response_contains(response, self.common))
         self.assertFalse(_response_contains(response, self.unowned))
         self.assertTrue(_response_contains(response, self.owned))
 
+    def test_retrieve_subscribed(self):
+        response = self.client.get('/api/library/active')
+        self.assertEqual(response.status_code, 200)
+        self.assertFalse(_response_contains(response, self.unowned))
+
+        Subscription.subscribe(user=self.user, item=self.unowned)
+        response = self.client.get('/api/library/active')
+        self.assertEqual(response.status_code, 200)
+        self.assertTrue(_response_contains(response, self.unowned))
+
+    def test_subscriptions(self):
+        response = self.client.delete(f'/api/library/{self.unowned.id}/unsubscribe')
+        self.assertEqual(response.status_code, 200)
+        self.assertFalse(self.user in self.unowned.subscribers())
+
+        response = self.client.post(f'/api/library/{self.unowned.id}/subscribe')
+        self.assertEqual(response.status_code, 200)
+        self.assertTrue(self.user in self.unowned.subscribers())
+
+        response = self.client.post(f'/api/library/{self.unowned.id}/subscribe')
+        self.assertEqual(response.status_code, 200)
+        self.assertTrue(self.user in self.unowned.subscribers())
+
+        response = self.client.delete(f'/api/library/{self.unowned.id}/unsubscribe')
+        self.assertEqual(response.status_code, 200)
+        self.assertFalse(self.user in self.unowned.subscribers())
+
 
 class TestRSFormViewset(APITestCase):
     ''' Testing RSForm view. '''
@@ -221,13 +251,13 @@ class TestRSFormViewset(APITestCase):
             item_type=LibraryItemType.OPERATIONS_SCHEMA,
             title='Test3'
         )
-        response = self.client.get('/api/rsforms/')
+        response = self.client.get('/api/rsforms')
         self.assertEqual(response.status_code, 200)
         self.assertFalse(_response_contains(response, non_schema))
         self.assertTrue(_response_contains(response, self.unowned.item))
         self.assertTrue(_response_contains(response, self.owned.item))
 
-        response = self.client.get('/api/library/')
+        response = self.client.get('/api/library')
         self.assertEqual(response.status_code, 200)
         self.assertTrue(_response_contains(response, non_schema))
         self.assertTrue(_response_contains(response, self.unowned.item))
@@ -236,11 +266,11 @@ class TestRSFormViewset(APITestCase):
     def test_contents(self):
         schema = RSForm.create(title='Title1')
         schema.insert_last(alias='X1', insert_type=CstType.BASE)
-        response = self.client.get(f'/api/rsforms/{schema.item.id}/contents/')
+        response = self.client.get(f'/api/rsforms/{schema.item.id}/contents')
         self.assertEqual(response.status_code, 200)
 
     def test_details(self):
-        schema = RSForm.create(title='Test')
+        schema = RSForm.create(title='Test', owner=self.user)
         x1 = schema.insert_at(1, 'X1', CstType.BASE)
         x2 = schema.insert_at(2, 'X2', CstType.BASE)
         x1.term_raw = 'человек'
@@ -250,7 +280,7 @@ class TestRSFormViewset(APITestCase):
         x1.save()
         x2.save()
 
-        response = self.client.get(f'/api/rsforms/{schema.item.id}/details/')
+        response = self.client.get(f'/api/rsforms/{schema.item.id}/details')
 
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.data['title'], 'Test')
@@ -262,12 +292,13 @@ class TestRSFormViewset(APITestCase):
         self.assertEqual(response.data['items'][1]['id'], x2.id)
         self.assertEqual(response.data['items'][1]['term']['raw'], x2.term_raw)
         self.assertEqual(response.data['items'][1]['term']['resolved'], x2.term_resolved)
+        self.assertEqual(response.data['subscribers'], [self.user.pk])
 
     def test_check(self):
         schema = RSForm.create(title='Test')
         schema.insert_at(1, 'X1', CstType.BASE)
         data = json.dumps({'expression': 'X1=X1'})
-        response = self.client.post(f'/api/rsforms/{schema.item.id}/check/', data=data, content_type='application/json')
+        response = self.client.post(f'/api/rsforms/{schema.item.id}/check', data=data, content_type='application/json')
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.data['parseResult'], True)
         self.assertEqual(response.data['syntax'], Syntax.MATH)
@@ -281,7 +312,7 @@ class TestRSFormViewset(APITestCase):
         x1.term_resolved = 'синий слон'
         x1.save()
         data = json.dumps({'text': '@{1|редкий} @{X1|plur,datv}'})
-        response = self.client.post(f'/api/rsforms/{schema.item.id}/resolve/', data=data, content_type='application/json')
+        response = self.client.post(f'/api/rsforms/{schema.item.id}/resolve', data=data, content_type='application/json')
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.data['input'], '@{1|редкий} @{X1|plur,datv}')
         self.assertEqual(response.data['output'], 'редким синим слонам')
@@ -307,7 +338,7 @@ class TestRSFormViewset(APITestCase):
         work_dir = os.path.dirname(os.path.abspath(__file__))
         with open(f'{work_dir}/data/sample-rsform.trs', 'rb') as file:
             data = {'file': file}
-            response = self.client.post('/api/rsforms/import-trs/', data=data, format='multipart')
+            response = self.client.post('/api/rsforms/import-trs', data=data, format='multipart')
         self.assertEqual(response.status_code, 201)
         self.assertEqual(response.data['owner'], self.user.pk)
         self.assertTrue(response.data['title'] != '')
@@ -315,7 +346,7 @@ class TestRSFormViewset(APITestCase):
     def test_export_trs(self):
         schema = RSForm.create(title='Test')
         schema.insert_at(1, 'X1', CstType.BASE)
-        response = self.client.get(f'/api/rsforms/{schema.item.id}/export-trs/')
+        response = self.client.get(f'/api/rsforms/{schema.item.id}/export-trs')
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.headers['Content-Disposition'], 'attachment; filename=Schema.trs')
         with io.BytesIO(response.content) as stream:
@@ -325,14 +356,14 @@ class TestRSFormViewset(APITestCase):
 
     def test_create_constituenta(self):
         data = json.dumps({'alias': 'X3', 'cst_type': 'basic'})
-        response = self.client.post(f'/api/rsforms/{self.unowned.item.id}/cst-create/',
+        response = self.client.post(f'/api/rsforms/{self.unowned.item.id}/cst-create',
                                     data=data, content_type='application/json')
         self.assertEqual(response.status_code, 403)
 
         item = self.owned.item
         Constituenta.objects.create(schema=item, alias='X1', cst_type='basic', order=1)
         x2 = Constituenta.objects.create(schema=item, alias='X2', cst_type='basic', order=2)
-        response = self.client.post(f'/api/rsforms/{item.id}/cst-create/',
+        response = self.client.post(f'/api/rsforms/{item.id}/cst-create',
                                     data=data, content_type='application/json')
         self.assertEqual(response.status_code, 201)
         self.assertEqual(response.data['new_cst']['alias'], 'X3')
@@ -340,7 +371,7 @@ class TestRSFormViewset(APITestCase):
         self.assertEqual(x3.order, 3)
 
         data = json.dumps({'alias': 'X4', 'cst_type': 'basic', 'insert_after': x2.id})
-        response = self.client.post(f'/api/rsforms/{item.id}/cst-create/',
+        response = self.client.post(f'/api/rsforms/{item.id}/cst-create',
                                     data=data, content_type='application/json')
         self.assertEqual(response.status_code, 201)
         self.assertEqual(response.data['new_cst']['alias'], 'X4')
@@ -361,16 +392,16 @@ class TestRSFormViewset(APITestCase):
             definition_raw='Test1', definition_resolved='Test2')
         
         data = json.dumps({'alias': 'D2', 'cst_type': 'term', 'id': self.cst2.pk})
-        response = self.client.patch(f'/api/rsforms/{self.unowned.item.id}/cst-rename/',
+        response = self.client.patch(f'/api/rsforms/{self.unowned.item.id}/cst-rename',
                                     data=data, content_type='application/json')
         self.assertEqual(response.status_code, 403)
 
-        response = self.client.patch(f'/api/rsforms/{self.owned.item.id}/cst-rename/',
+        response = self.client.patch(f'/api/rsforms/{self.owned.item.id}/cst-rename',
                                     data=data, content_type='application/json')
         self.assertEqual(response.status_code, 400)
 
         data = json.dumps({'alias': self.cst1.alias, 'cst_type': 'term', 'id': self.cst1.pk})
-        response = self.client.patch(f'/api/rsforms/{self.owned.item.id}/cst-rename/',
+        response = self.client.patch(f'/api/rsforms/{self.owned.item.id}/cst-rename',
                                     data=data, content_type='application/json')
         self.assertEqual(response.status_code, 400)
 
@@ -384,7 +415,7 @@ class TestRSFormViewset(APITestCase):
         self.assertEqual(self.cst1.order, 1)
         self.assertEqual(self.cst1.alias, 'X1')
         self.assertEqual(self.cst1.cst_type, CstType.BASE)
-        response = self.client.patch(f'/api/rsforms/{item.id}/cst-rename/',
+        response = self.client.patch(f'/api/rsforms/{item.id}/cst-rename',
                                     data=data, content_type='application/json')
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.data['new_cst']['alias'], 'D2')
@@ -407,7 +438,7 @@ class TestRSFormViewset(APITestCase):
             'definition_raw': '4'
         })
         item = self.owned.item
-        response = self.client.post(f'/api/rsforms/{item.id}/cst-create/',
+        response = self.client.post(f'/api/rsforms/{item.id}/cst-create',
                                     data=data, content_type='application/json')
         self.assertEqual(response.status_code, 201)
         self.assertEqual(response.data['new_cst']['alias'], 'X3')
@@ -422,14 +453,14 @@ class TestRSFormViewset(APITestCase):
     def test_delete_constituenta(self):
         schema = self.owned
         data = json.dumps({'items': [{'id': 1337}]})
-        response = self.client.patch(f'/api/rsforms/{schema.item.id}/cst-multidelete/',
+        response = self.client.patch(f'/api/rsforms/{schema.item.id}/cst-multidelete',
                                      data=data, content_type='application/json')
         self.assertEqual(response.status_code, 400)
 
         x1 = Constituenta.objects.create(schema=schema.item, alias='X1', cst_type='basic', order=1)
         x2 = Constituenta.objects.create(schema=schema.item, alias='X2', cst_type='basic', order=2)
         data = json.dumps({'items': [{'id': x1.id}]})
-        response = self.client.patch(f'/api/rsforms/{schema.item.id}/cst-multidelete/',
+        response = self.client.patch(f'/api/rsforms/{schema.item.id}/cst-multidelete',
                                      data=data, content_type='application/json')
         x2.refresh_from_db()
         schema.item.refresh_from_db()
@@ -441,21 +472,21 @@ class TestRSFormViewset(APITestCase):
 
         x3 = Constituenta.objects.create(schema=self.unowned.item, alias='X1', cst_type='basic', order=1)
         data = json.dumps({'items': [{'id': x3.id}]})
-        response = self.client.patch(f'/api/rsforms/{schema.item.id}/cst-multidelete/',
+        response = self.client.patch(f'/api/rsforms/{schema.item.id}/cst-multidelete',
                                      data=data, content_type='application/json')
         self.assertEqual(response.status_code, 400)
 
     def test_move_constituenta(self):
         item = self.owned.item
         data = json.dumps({'items': [{'id': 1337}], 'move_to': 1})
-        response = self.client.patch(f'/api/rsforms/{item.id}/cst-moveto/',
+        response = self.client.patch(f'/api/rsforms/{item.id}/cst-moveto',
                                      data=data, content_type='application/json')
         self.assertEqual(response.status_code, 400)
 
         x1 = Constituenta.objects.create(schema=item, alias='X1', cst_type='basic', order=1)
         x2 = Constituenta.objects.create(schema=item, alias='X2', cst_type='basic', order=2)
         data = json.dumps({'items': [{'id': x2.id}], 'move_to': 1})
-        response = self.client.patch(f'/api/rsforms/{item.id}/cst-moveto/',
+        response = self.client.patch(f'/api/rsforms/{item.id}/cst-moveto',
                                      data=data, content_type='application/json')
         x1.refresh_from_db()
         x2.refresh_from_db()
@@ -466,20 +497,20 @@ class TestRSFormViewset(APITestCase):
 
         x3 = Constituenta.objects.create(schema=self.unowned.item, alias='X1', cst_type='basic', order=1)
         data = json.dumps({'items': [{'id': x3.id}], 'move_to': 1})
-        response = self.client.patch(f'/api/rsforms/{item.id}/cst-moveto/',
+        response = self.client.patch(f'/api/rsforms/{item.id}/cst-moveto',
                                      data=data, content_type='application/json')
         self.assertEqual(response.status_code, 400)
 
     def test_reset_aliases(self):
         item = self.owned.item
-        response = self.client.patch(f'/api/rsforms/{item.id}/reset-aliases/')
+        response = self.client.patch(f'/api/rsforms/{item.id}/reset-aliases')
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.data['id'], item.id)
 
         x2 = Constituenta.objects.create(schema=item, alias='X2', cst_type='basic', order=1)
         x1 = Constituenta.objects.create(schema=item, alias='X1', cst_type='basic', order=2)
         d11 = Constituenta.objects.create(schema=item, alias='D11', cst_type='term', order=3)
-        response = self.client.patch(f'/api/rsforms/{item.id}/reset-aliases/')
+        response = self.client.patch(f'/api/rsforms/{item.id}/reset-aliases')
         x1.refresh_from_db()
         x2.refresh_from_db()
         d11.refresh_from_db()
@@ -491,7 +522,7 @@ class TestRSFormViewset(APITestCase):
         self.assertEqual(d11.order, 3)
         self.assertEqual(d11.alias, 'D1')
 
-        response = self.client.patch(f'/api/rsforms/{item.id}/reset-aliases/')
+        response = self.client.patch(f'/api/rsforms/{item.id}/reset-aliases')
         self.assertEqual(response.status_code, 200)
 
     def test_load_trs(self):
@@ -502,13 +533,13 @@ class TestRSFormViewset(APITestCase):
         work_dir = os.path.dirname(os.path.abspath(__file__))
         with open(f'{work_dir}/data/sample-rsform.trs', 'rb') as file:
             data = {'file': file, 'load_metadata': False}
-            response = self.client.patch(f'/api/rsforms/{schema.item.id}/load-trs/', data=data, format='multipart')
+            response = self.client.patch(f'/api/rsforms/{schema.item.id}/load-trs', data=data, format='multipart')
         schema.item.refresh_from_db()
         self.assertEqual(response.status_code, 200)
         self.assertEqual(schema.item.title, 'Testt11')
         self.assertEqual(len(response.data['items']), 25)
         self.assertEqual(schema.constituents().count(), 25)
-        self.assertFalse(Constituenta.objects.all().filter(pk=x1.id).exists())
+        self.assertFalse(Constituenta.objects.filter(pk=x1.id).exists())
 
     def test_clone(self):
         item = self.owned.item
@@ -524,7 +555,7 @@ class TestRSFormViewset(APITestCase):
         d1.save()
 
         data = json.dumps({'title': 'Title'})
-        response = self.client.post(f'/api/library/{item.id}/clone/', data=data, content_type='application/json')
+        response = self.client.post(f'/api/library/{item.id}/clone', data=data, content_type='application/json')
 
         self.assertEqual(response.status_code, 201)
         self.assertEqual(response.data['title'], 'Title')
@@ -546,7 +577,7 @@ class TestFunctionalViews(APITestCase):
         work_dir = os.path.dirname(os.path.abspath(__file__))
         with open(f'{work_dir}/data/sample-rsform.trs', 'rb') as file:
             data = {'file': file, 'title': 'Test123', 'comment': '123', 'alias': 'ks1'}
-            response = self.client.post('/api/rsforms/create-detailed/', data=data, format='multipart')
+            response = self.client.post('/api/rsforms/create-detailed', data=data, format='multipart')
         self.assertEqual(response.status_code, 201)
         self.assertEqual(response.data['owner'], self.user.pk)
         self.assertEqual(response.data['title'], 'Test123')
@@ -555,7 +586,7 @@ class TestFunctionalViews(APITestCase):
 
     def test_create_rsform_fallback(self):
         data = {'title': 'Test123', 'comment': '123', 'alias': 'ks1'}
-        response = self.client.post('/api/rsforms/create-detailed/', data=data)
+        response = self.client.post('/api/rsforms/create-detailed', data=data)
         self.assertEqual(response.status_code, 201)
         self.assertEqual(response.data['owner'], self.user.pk)
         self.assertEqual(response.data['title'], 'Test123')
diff --git a/rsconcept/backend/apps/rsform/urls.py b/rsconcept/backend/apps/rsform/urls.py
index 289c1f98..9fb6b76b 100644
--- a/rsconcept/backend/apps/rsform/urls.py
+++ b/rsconcept/backend/apps/rsform/urls.py
@@ -3,17 +3,17 @@ from django.urls import path, include
 from rest_framework import routers
 from . import views
 
-library_router = routers.SimpleRouter()
+library_router = routers.SimpleRouter(trailing_slash=False)
 library_router.register('library', views.LibraryViewSet)
 library_router.register('rsforms', views.RSFormViewSet)
 
 urlpatterns = [
-    path('library/active/', views.LibraryActiveView.as_view(), name='library'),
-    path('constituents/<int:pk>/', views.ConstituentAPIView.as_view(), name='constituenta-detail'),
-    path('rsforms/import-trs/', views.TrsImportView.as_view()),
-    path('rsforms/create-detailed/', views.create_rsform),
-    path('func/parse-expression/', views.parse_expression),
-    path('func/to-ascii/', views.convert_to_ascii),
-    path('func/to-math/', views.convert_to_math),
+    path('library/active', views.LibraryActiveView.as_view(), name='library'),
+    path('constituents/<int:pk>', views.ConstituentAPIView.as_view(), name='constituenta-detail'),
+    path('rsforms/import-trs', views.TrsImportView.as_view()),
+    path('rsforms/create-detailed', views.create_rsform),
+    path('func/parse-expression', views.parse_expression),
+    path('func/to-ascii', views.convert_to_ascii),
+    path('func/to-math', views.convert_to_math),
     path('', include(library_router.urls)),
 ]
diff --git a/rsconcept/backend/apps/rsform/views.py b/rsconcept/backend/apps/rsform/views.py
index 9dd0e311..7d45d86a 100644
--- a/rsconcept/backend/apps/rsform/views.py
+++ b/rsconcept/backend/apps/rsform/views.py
@@ -24,7 +24,8 @@ class LibraryActiveView(generics.ListAPIView):
     def get_queryset(self):
         user = self.request.user
         if not user.is_anonymous:
-            return m.LibraryItem.objects.filter(Q(is_common=True) | Q(owner=user))
+            # pyling: disable=unsupported-binary-operation
+            return m.LibraryItem.objects.filter(Q(is_common=True) | Q(owner=user) | Q(subscription__user=user))
         else:
             return m.LibraryItem.objects.filter(is_common=True)
 
@@ -62,7 +63,7 @@ class LibraryViewSet(viewsets.ModelViewSet):
     def get_permissions(self):
         if self.action in ['update', 'destroy', 'partial_update']:
             permission_classes = [utils.ObjectOwnerOrAdmin]
-        elif self.action in ['create', 'clone']:
+        elif self.action in ['create', 'clone', 'subscribe', 'unsubscribe']:
             permission_classes = [permissions.IsAuthenticated]
         elif self.action in ['claim']:
             permission_classes = [utils.IsClaimable]
@@ -70,13 +71,16 @@ class LibraryViewSet(viewsets.ModelViewSet):
             permission_classes = [permissions.AllowAny]
         return [permission() for permission in permission_classes]
 
+    def _get_item(self) -> m.LibraryItem:
+        return cast(m.LibraryItem, self.get_object())
+
     @transaction.atomic
     @action(detail=True, methods=['post'], url_path='clone')
     def clone(self, request, pk):
         ''' Endpoint: Create deep copy of library item. '''
         serializer = s.LibraryItemSerializer(data=request.data)
         serializer.is_valid(raise_exception=True)
-        item = cast(m.LibraryItem, self.get_object())
+        item = self._get_item()
         if item.item_type == m.LibraryItemType.RSFORM:
             schema = m.RSForm(item)
             clone_data = s.RSFormTRSSerializer(schema).data
@@ -93,21 +97,37 @@ class LibraryViewSet(viewsets.ModelViewSet):
             return Response(status=201, data=m.PyConceptAdapter(new_schema).full())
         return Response(status=404)
 
+    @transaction.atomic
     @action(detail=True, methods=['post'])
     def claim(self, request, pk=None):
         ''' Endpoint: Claim ownership of LibraryItem. '''
-        item = cast(m.LibraryItem, self.get_object())
+        item = self._get_item()
         if item.owner == self.request.user:
             return Response(status=304)
         else:
             item.owner = self.request.user
             item.save()
+            m.Subscription.subscribe(user=item.owner, item=item)
             return Response(status=200, data=s.LibraryItemSerializer(item).data)
 
+    @action(detail=True, methods=['post'])
+    def subscribe(self, request, pk):
+        ''' Endpoint: Subscribe current user to item. '''
+        item = self._get_item()
+        m.Subscription.subscribe(user=self.request.user, item=item)
+        return Response(status=200)
+
+    @action(detail=True, methods=['delete'])
+    def unsubscribe(self, request, pk):
+        ''' Endpoint: Unsubscribe current user from item. '''
+        item = self._get_item()
+        m.Subscription.unsubscribe(user=self.request.user, item=item)
+        return Response(status=200)
+
 
 class RSFormViewSet(viewsets.GenericViewSet, generics.ListAPIView, generics.RetrieveAPIView):
     ''' Endpoint: RSForm operations. '''
-    queryset = m.LibraryItem.objects.all().filter(item_type=m.LibraryItemType.RSFORM)
+    queryset = m.LibraryItem.objects.filter(item_type=m.LibraryItemType.RSFORM)
     serializer_class = s.LibraryItemSerializer
 
     def _get_schema(self) -> m.RSForm:
diff --git a/rsconcept/backend/apps/users/serializers.py b/rsconcept/backend/apps/users/serializers.py
index 30ad8170..6ddc6618 100644
--- a/rsconcept/backend/apps/users/serializers.py
+++ b/rsconcept/backend/apps/users/serializers.py
@@ -3,6 +3,7 @@ from django.contrib.auth import authenticate
 from django.contrib.auth.password_validation import validate_password
 from rest_framework import serializers
 
+from apps.rsform.models import Subscription
 from . import models
 
 
@@ -40,16 +41,23 @@ class LoginSerializer(serializers.Serializer):
         raise NotImplementedError('unexpected `update()` call')
 
 
-class AuthSerializer(serializers.ModelSerializer):
+class AuthSerializer(serializers.Serializer):
     ''' Serializer: Authentication data. '''
-    class Meta:
-        ''' serializer metadata. '''
-        model = models.User
-        fields = [
-            'id',
-            'username',
-            'is_staff'
-        ]
+    def to_representation(self, instance: models.User) -> dict:
+        if instance.is_anonymous:
+            return {
+                'id': None,
+                'username': '',
+                'is_staff': False,
+                'subscriptions': []
+            }
+        else:
+            return {
+                'id': instance.pk,
+                'username': instance.username,
+                'is_staff': instance.is_staff,
+                'subscriptions': [sub.item.pk for sub in Subscription.objects.filter(user=instance)]
+            }
 
 
 class UserInfoSerializer(serializers.ModelSerializer):
diff --git a/rsconcept/backend/apps/users/tests/t_views.py b/rsconcept/backend/apps/users/tests/t_views.py
index 6187b844..1f755911 100644
--- a/rsconcept/backend/apps/users/tests/t_views.py
+++ b/rsconcept/backend/apps/users/tests/t_views.py
@@ -3,9 +3,10 @@ import json
 from rest_framework.test import APITestCase, APIClient
 
 from apps.users.models import User
+from apps.rsform.models import LibraryItem, LibraryItemType
 
 
-# TODO: test AUTH and ATIVE_USERS
+# TODO: test ACTIVE_USERS
 class TestUserAPIViews(APITestCase):
     def setUp(self):
         self.username = 'UserTest'
@@ -30,6 +31,30 @@ class TestUserAPIViews(APITestCase):
 
         self.assertEqual(self.client.post('/users/api/logout').status_code, 403)
 
+    def test_auth(self):
+        LibraryItem.objects.create(item_type=LibraryItemType.RSFORM, title='T1')
+        item = LibraryItem.objects.create(
+            item_type=LibraryItemType.RSFORM,
+            title='Test',
+            alias='T1',
+            is_common=True,
+            owner=self.user
+        )
+        response = self.client.get('/users/api/auth')
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.data['id'], None)
+        self.assertEqual(response.data['username'], '')
+        self.assertEqual(response.data['is_staff'], False)
+        self.assertEqual(response.data['subscriptions'], [])
+
+        self.client.force_login(self.user)
+        response = self.client.get('/users/api/auth')
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.data['id'], self.user.pk)
+        self.assertEqual(response.data['username'], self.user.username)
+        self.assertEqual(response.data['is_staff'], self.user.is_staff)
+        self.assertEqual(response.data['subscriptions'], [item.pk])
+
 
 class TestUserUserProfileAPIView(APITestCase):
     def setUp(self):
diff --git a/rsconcept/backend/apps/users/views.py b/rsconcept/backend/apps/users/views.py
index 56055cb8..6cd097e8 100644
--- a/rsconcept/backend/apps/users/views.py
+++ b/rsconcept/backend/apps/users/views.py
@@ -8,9 +8,7 @@ from . import serializers
 from . import models
 
 class LoginAPIView(views.APIView):
-    '''
-    Endpoint: Login user via username + password.
-    '''
+    ''' Endpoint: Login via username + password. '''
     permission_classes = (permissions.AllowAny,)
 
     def post(self, request):
@@ -25,9 +23,7 @@ class LoginAPIView(views.APIView):
 
 
 class LogoutAPIView(views.APIView):
-    '''
-    Endpoint: Logout current user.
-    '''
+    ''' Endpoint: Logout. '''
     permission_classes = (permissions.IsAuthenticated,)
 
     def post(self, request):
@@ -36,17 +32,13 @@ class LogoutAPIView(views.APIView):
 
 
 class SignupAPIView(generics.CreateAPIView):
-    '''
-    Register user.
-    '''
+    ''' Endpoint: Register user. '''
     permission_classes = (permissions.AllowAny, )
     serializer_class = serializers.SignupSerializer
 
 
 class AuthAPIView(generics.RetrieveAPIView):
-    '''
-    Get current user authentification ID.
-    '''
+    ''' Endpoint: Current user info. '''
     permission_classes = (permissions.AllowAny,)
     serializer_class = serializers.AuthSerializer
 
@@ -55,9 +47,7 @@ class AuthAPIView(generics.RetrieveAPIView):
 
 
 class ActiveUsersView(generics.ListAPIView):
-    '''
-    Endpoint: Get list of active users.
-    '''
+    ''' Endpoint: Get list of active users. '''
     permission_classes = (permissions.AllowAny,)
     serializer_class = serializers.UserSerializer
 
@@ -66,9 +56,7 @@ class ActiveUsersView(generics.ListAPIView):
 
 
 class UserProfileAPIView(generics.RetrieveUpdateAPIView):
-    '''
-    Endpoint: User profile info.
-    '''
+    ''' Endpoint: User profile. '''
     permission_classes = (permissions.IsAuthenticated,)
     serializer_class = serializers.UserSerializer
 
@@ -77,9 +65,7 @@ class UserProfileAPIView(generics.RetrieveUpdateAPIView):
 
 
 class UpdatePassword(views.APIView):
-    '''
-    Endpoint: Change password for current user.
-    '''
+    ''' Endpoint: Change password for current user. '''
     permission_classes = (permissions.IsAuthenticated, )
 
     def get_object(self, queryset=None):
diff --git a/rsconcept/backend/fixtures/InitialData.json b/rsconcept/backend/fixtures/InitialData.json
index 3c07aa53..8fbeddf6 100644
--- a/rsconcept/backend/fixtures/InitialData.json
+++ b/rsconcept/backend/fixtures/InitialData.json
@@ -159,7 +159,7 @@
         "alias": "M0005",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.052Z",
         "time_update": "2023-08-25T19:03:40.052Z"
     }
@@ -174,7 +174,7 @@
         "alias": "M0006",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.066Z",
         "time_update": "2023-08-25T19:03:40.066Z"
     }
@@ -189,7 +189,7 @@
         "alias": "M0007",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.077Z",
         "time_update": "2023-08-25T19:03:40.077Z"
     }
@@ -204,7 +204,7 @@
         "alias": "M0008",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.081Z",
         "time_update": "2023-08-25T19:03:40.081Z"
     }
@@ -219,7 +219,7 @@
         "alias": "M0009",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.094Z",
         "time_update": "2023-08-25T19:03:40.095Z"
     }
@@ -234,7 +234,7 @@
         "alias": "M0010",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.118Z",
         "time_update": "2023-08-25T19:03:40.118Z"
     }
@@ -249,7 +249,7 @@
         "alias": "M0011",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.132Z",
         "time_update": "2023-08-25T19:03:40.132Z"
     }
@@ -264,7 +264,7 @@
         "alias": "M0012",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.152Z",
         "time_update": "2023-08-25T19:03:40.152Z"
     }
@@ -279,7 +279,7 @@
         "alias": "M0013",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.167Z",
         "time_update": "2023-08-25T19:03:40.168Z"
     }
@@ -294,7 +294,7 @@
         "alias": "M0014",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.196Z",
         "time_update": "2023-08-25T19:03:40.196Z"
     }
@@ -309,7 +309,7 @@
         "alias": "M0015",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.207Z",
         "time_update": "2023-08-25T19:03:40.207Z"
     }
@@ -324,7 +324,7 @@
         "alias": "M0016",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.258Z",
         "time_update": "2023-08-25T19:03:40.258Z"
     }
@@ -354,7 +354,7 @@
         "alias": "D0002",
         "comment": "",
         "is_common": true,
-        "is_canonical": true,
+        "is_canonical": false,
         "time_create": "2023-08-25T19:03:40.459Z",
         "time_update": "2023-08-25T19:03:40.460Z"
     }
diff --git a/rsconcept/frontend/src/components/Common/TextArea.tsx b/rsconcept/frontend/src/components/Common/TextArea.tsx
index 2b7ffd9b..d2158ef2 100644
--- a/rsconcept/frontend/src/components/Common/TextArea.tsx
+++ b/rsconcept/frontend/src/components/Common/TextArea.tsx
@@ -3,14 +3,15 @@ import { TextareaHTMLAttributes } from 'react';
 import Label from './Label';
 
 export interface TextAreaProps 
-extends Omit<TextareaHTMLAttributes<HTMLTextAreaElement>, 'className'> {
+extends Omit<TextareaHTMLAttributes<HTMLTextAreaElement>, 'className' | 'title'> {
   label: string
+  tooltip?: string
   widthClass?: string
   colorClass?: string
 }
 
 function TextArea({
-  id, label, required,
+  id, label, required, tooltip,
   widthClass = 'w-full',
   colorClass = 'clr-input',
   rows = 4,
@@ -24,10 +25,11 @@ function TextArea({
         htmlFor={id}
       />
       <textarea id={id}
-          className={`px-3 py-2 mt-2 leading-tight border shadow ${colorClass} ${widthClass}`}
-          rows={rows}
-          required={required}
-          {...props}
+        title={tooltip}
+        className={`px-3 py-2 mt-2 leading-tight border shadow ${colorClass} ${widthClass}`}
+        rows={rows}
+        required={required}
+        {...props}
       />
     </div>
   );
diff --git a/rsconcept/frontend/src/components/Common/TextInput.tsx b/rsconcept/frontend/src/components/Common/TextInput.tsx
index 0008c35c..7e539dd1 100644
--- a/rsconcept/frontend/src/components/Common/TextInput.tsx
+++ b/rsconcept/frontend/src/components/Common/TextInput.tsx
@@ -3,16 +3,17 @@ import { type InputHTMLAttributes } from 'react';
 import Label from './Label';
 
 interface TextInputProps
-extends Omit<InputHTMLAttributes<HTMLInputElement>, 'className'> {
+extends Omit<InputHTMLAttributes<HTMLInputElement>, 'className' | 'title'> {
   id: string
   label: string
+  tooltip?: string
   widthClass?: string
   colorClass?: string
   singleRow?: boolean
 }
 
 function TextInput({
-  id, required, label, singleRow,
+  id, required, label, singleRow, tooltip,
   widthClass = 'w-full',
   colorClass = 'clr-input',
   ...props
@@ -25,6 +26,7 @@ function TextInput({
         htmlFor={id}
       />
       <input id={id}
+        title={tooltip}
         className={`px-3 py-2 mt-2 leading-tight border shadow truncate hover:text-clip ${colorClass} ${singleRow ? '' : widthClass}`}
         required={required}
         {...props}
diff --git a/rsconcept/frontend/src/context/LibraryContext.tsx b/rsconcept/frontend/src/context/LibraryContext.tsx
index 402ee4fd..5ff2c251 100644
--- a/rsconcept/frontend/src/context/LibraryContext.tsx
+++ b/rsconcept/frontend/src/context/LibraryContext.tsx
@@ -44,7 +44,9 @@ export const LibraryState = ({ children }: LibraryStateProps) => {
   (params: ILibraryFilter) => {
     let result = items;
     if (params.ownedBy) {
-      result = result.filter(item => item.owner === params.ownedBy);
+      result = result.filter(item =>
+        item.owner === params.ownedBy
+        || user?.subscriptions.includes(item.id));
     }
     if (params.is_common !== undefined) {
       result = result.filter(item => item.is_common === params.is_common);
@@ -53,7 +55,7 @@ export const LibraryState = ({ children }: LibraryStateProps) => {
       result = result.filter(item => matchLibraryItem(params.queryMeta!, item));
     }
     return result;
-  }, [items]);
+  }, [items, user]);
 
   const reload = useCallback(
   (callback?: () => void) => {
diff --git a/rsconcept/frontend/src/context/RSFormContext.tsx b/rsconcept/frontend/src/context/RSFormContext.tsx
index 689b5dbe..d530a3e2 100644
--- a/rsconcept/frontend/src/context/RSFormContext.tsx
+++ b/rsconcept/frontend/src/context/RSFormContext.tsx
@@ -1,15 +1,14 @@
 import { createContext, useCallback, useContext, useMemo, useState } from 'react'
-import { toast } from 'react-toastify'
 
 import { type ErrorInfo } from '../components/BackendError'
 import { useRSFormDetails } from '../hooks/useRSFormDetails'
 import {
-  type DataCallback, getTRSFile,
+  type DataCallback, deleteUnsubscribe,
+getTRSFile,
   patchConstituenta, patchDeleteConstituenta,
 patchLibraryItem,
   patchMoveConstituenta, patchRenameConstituenta,
-  patchResetAliases,   patchUploadTRS,  postClaimLibraryItem, postNewConstituenta
-} from '../utils/backendAPI'
+  patchResetAliases,   patchUploadTRS,  postClaimLibraryItem, postNewConstituenta, postSubscribe} from '../utils/backendAPI'
 import {
   IConstituentaList, IConstituentaMeta, ICstCreateData,
   ICstMovetoData, ICstRenameData, ICstUpdateData, ILibraryItem, 
@@ -33,10 +32,11 @@ interface IRSFormContext {
 
   toggleForceAdmin: () => void
   toggleReadonly: () => void
-  toggleTracking: () => void
   
   update: (data: ILibraryUpdateData, callback?: DataCallback<ILibraryItem>) => void
   claim: (callback?: DataCallback<ILibraryItem>) => void
+  subscribe: (callback?: () => void) => void
+  unsubscribe: (callback?: () => void) => void
   download: (callback: DataCallback<Blob>) => void
   upload: (data: IRSFormUploadData, callback: () => void) => void
 
@@ -72,6 +72,7 @@ export const RSFormState = ({ schemaID, children }: RSFormStateProps) => {
 
   const [ isForceAdmin, setIsForceAdmin ] = useState(false);
   const [ isReadonly, setIsReadonly ] = useState(false);
+  const [ toggleTracking, setToggleTracking ] = useState(false);
 
   const isOwned = useMemo(
   () => {
@@ -93,13 +94,12 @@ export const RSFormState = ({ schemaID, children }: RSFormStateProps) => {
 
   const isTracking = useMemo(
   () => {
-    return true;
-  }, []);
-
-  const toggleTracking = useCallback(
-  () => {
-    toast.info('Отслеживание в разработке...')
-  }, []);
+    if (!schema || !user) {
+      return false;
+    }
+    return schema.subscribers.includes(user.id);
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [user, schema, toggleTracking]);
 
   const update = useCallback(
   (data: ILibraryUpdateData, callback?: DataCallback<ILibraryItem>) => {
@@ -153,6 +153,52 @@ export const RSFormState = ({ schemaID, children }: RSFormStateProps) => {
       }
     });
   }, [schemaID, setError, schema, user, setSchema]);
+  
+  const subscribe = useCallback(
+  (callback?: () => void) => {
+    if (!schema || !user) {
+      return;
+    }
+    setError(undefined)
+    postSubscribe(schemaID, {
+      showError: true,
+      setLoading: setProcessing,
+      onError: error => setError(error),
+      onSuccess: () => {
+        if (!schema.subscribers.includes(user.id)) {
+          schema.subscribers.push(user.id);
+        }
+        if (!user.subscriptions.includes(schema.id)) {
+          user.subscriptions.push(schema.id);
+        }
+        setToggleTracking(prev => !prev);
+        if (callback) callback();
+      }
+    });
+  }, [schemaID, setError, schema, user]);
+
+  const unsubscribe = useCallback(
+  (callback?: () => void) => {
+    if (!schema || !user) {
+      return;
+    }
+    setError(undefined)
+    deleteUnsubscribe(schemaID, {
+      showError: true,
+      setLoading: setProcessing,
+      onError: error => setError(error),
+      onSuccess: () => {
+        if (schema.subscribers.includes(user.id)) {
+          schema.subscribers.splice(schema.subscribers.indexOf(user.id), 1);
+        }
+        if (user.subscriptions.includes(schema.id)) {
+          user.subscriptions.splice(user.subscriptions.indexOf(schema.id), 1);
+        }
+        setToggleTracking(prev => !prev);
+        if (callback) callback();
+      }
+    });
+  }, [schemaID, setError, schema, user]);
 
   const resetAliases = useCallback(
   (callback?: () => void) => {
@@ -264,8 +310,7 @@ export const RSFormState = ({ schemaID, children }: RSFormStateProps) => {
       isClaimable, isTracking,
       toggleForceAdmin: () => setIsForceAdmin(prev => !prev),
       toggleReadonly: () => setIsReadonly(prev => !prev),
-      toggleTracking,
-      update, download, upload, claim, resetAliases,
+      update, download, upload, claim, resetAliases, subscribe, unsubscribe,
       cstUpdate, cstCreate, cstRename, cstDelete, cstMoveTo
     }}>
       { children }
diff --git a/rsconcept/frontend/src/index.css b/rsconcept/frontend/src/index.css
index 7ab21149..9cc49e47 100644
--- a/rsconcept/frontend/src/index.css
+++ b/rsconcept/frontend/src/index.css
@@ -110,6 +110,10 @@
     @apply bg-white dark:bg-gray-900 checked:bg-blue-700 dark:checked:bg-orange-500
   }
 
+  .clr-input-red {
+    @apply bg-red-300 dark:bg-red-700
+  }
+
   .text-url {
     @apply hover:text-blue-600 text-blue-400 dark:text-orange-600 dark:hover:text-orange-400
   }
diff --git a/rsconcept/frontend/src/pages/LibraryPage/ViewLibrary.tsx b/rsconcept/frontend/src/pages/LibraryPage/ViewLibrary.tsx
index ecd01611..e8fdb85c 100644
--- a/rsconcept/frontend/src/pages/LibraryPage/ViewLibrary.tsx
+++ b/rsconcept/frontend/src/pages/LibraryPage/ViewLibrary.tsx
@@ -4,8 +4,11 @@ import { useNavigate } from 'react-router-dom';
 
 import ConceptDataTable from '../../components/Common/ConceptDataTable';
 import TextURL from '../../components/Common/TextURL';
+import { EducationIcon, EyeIcon, GroupIcon } from '../../components/Icons';
+import { useAuth } from '../../context/AuthContext';
 import { useNavSearch } from '../../context/NavSearchContext';
 import { useUsers } from '../../context/UsersContext';
+import { prefixes } from '../../utils/constants';
 import { ILibraryItem } from '../../utils/models'
 
 interface ViewLibraryProps {
@@ -14,14 +17,35 @@ interface ViewLibraryProps {
 
 function ViewLibrary({ items }: ViewLibraryProps) {
   const { resetQuery: cleanQuery } = useNavSearch();
+  const { user } = useAuth();
   const navigate = useNavigate();
   const intl = useIntl();
   const { getUserLabel } = useUsers();
 
   const openRSForm = (item: ILibraryItem) => navigate(`/rsforms/${item.id}`);
 
-  const columns = useMemo(() =>
-  [
+  const columns = useMemo(
+  () => [
+    {
+      name: '',
+      id: 'status',
+      minWidth: '60px',
+      maxWidth: '60px',
+      cell: (item: ILibraryItem) => {
+        return (<>
+          <div
+            className='flex items-center justify-start gap-1'
+            id={`${prefixes.library_list}${item.id}`}
+          >
+            {user && user.subscriptions.includes(item.id) && <EyeIcon size={3}/>}
+            {item.is_common && <GroupIcon size={3}/>}
+            {item.is_canonical && <EducationIcon size={3}/>}
+          </div>
+        </>);
+      },
+      sortable: true,
+      reorder: true
+    },
     {
       name: 'Шифр',
       id: 'alias',
@@ -30,16 +54,6 @@ function ViewLibrary({ items }: ViewLibraryProps) {
       sortable: true,
       reorder: true
     },
-    {
-      name: 'Статусы',
-      id: 'status',
-      maxWidth: '50px',
-      selector: (item: ILibraryItem) => {
-        return `${item.is_canonical ? 'C': ''}${item.is_common ? 'S': ''}`
-      },
-      sortable: true,
-      reorder: true
-    },
     {
       name: 'Название',
       id: 'title',
@@ -66,7 +80,7 @@ function ViewLibrary({ items }: ViewLibraryProps) {
       sortable: true,
       reorder: true
     }
-  ], [intl, getUserLabel]);
+  ], [intl, getUserLabel, user]);
   
   return (
     <ConceptDataTable
diff --git a/rsconcept/frontend/src/pages/RSFormPage/EditorItems.tsx b/rsconcept/frontend/src/pages/RSFormPage/EditorItems.tsx
index 33620c04..2bfebf0d 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/EditorItems.tsx
+++ b/rsconcept/frontend/src/pages/RSFormPage/EditorItems.tsx
@@ -175,7 +175,6 @@ function EditorItems({ onOpenEdit, onCreateCst, onDeleteCst }: EditorItemsProps)
     {
       name: 'Имя',
       id: 'alias',
-      selector: (cst: IConstituenta) => cst.alias,
       cell: (cst: IConstituenta) => {
         const info = mapStatusInfo.get(cst.status)!;
         return (<>
diff --git a/rsconcept/frontend/src/pages/RSFormPage/EditorRSForm.tsx b/rsconcept/frontend/src/pages/RSFormPage/EditorRSForm.tsx
index bd2cd1bf..4b56bccc 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/EditorRSForm.tsx
+++ b/rsconcept/frontend/src/pages/RSFormPage/EditorRSForm.tsx
@@ -154,13 +154,19 @@ function EditorRSForm({ onDestroy, onClaim, onShare, onDownload }: EditorRSFormP
           icon={<SaveIcon size={6} />}
         />
       </div>
-
+      
       <div className='flex justify-start mt-2'>
         <label className='font-semibold'>Владелец:</label>
         <span className='min-w-[200px] ml-2 overflow-ellipsis overflow-hidden whitespace-nowrap'>
           {getUserLabel(schema?.owner ?? null)}
         </span>
       </div>
+      <div className='flex justify-start mt-2'>
+        <label className='font-semibold'>Отслеживают:</label>
+        <span id='subscriber-count' className='ml-2'>
+          { schema?.subscribers.length ?? 0 }
+        </span>
+      </div>
       <div className='flex justify-start mt-2'>
         <label className='font-semibold'>Дата обновления:</label>
         <span className='ml-2'>{schema && new Date(schema?.time_update).toLocaleString(intl.locale)}</span>
diff --git a/rsconcept/frontend/src/pages/RSFormPage/EditorTermGraph.tsx b/rsconcept/frontend/src/pages/RSFormPage/EditorTermGraph.tsx
index db9f9306..68f5165d 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/EditorTermGraph.tsx
+++ b/rsconcept/frontend/src/pages/RSFormPage/EditorTermGraph.tsx
@@ -176,7 +176,6 @@ function EditorTermGraph({ onOpenEdit, onCreateCst, onDeleteCst }: EditorTermGra
         });
       }
     });
-    console.log(result);
     return result;
   }, [schema, coloringScheme, filtered.nodes, darkMode, noTerms]);
 
@@ -194,7 +193,6 @@ function EditorTermGraph({ onOpenEdit, onCreateCst, onDeleteCst }: EditorTermGra
         edgeID += 1;
       });
     });
-    console.log(result);
     return result;
   }, [filtered.nodes]);
   
@@ -256,7 +254,6 @@ function EditorTermGraph({ onOpenEdit, onCreateCst, onDeleteCst }: EditorTermGra
 
   // Implement hotkeys for editing
   function handleKeyDown(event: React.KeyboardEvent<HTMLDivElement>) {
-    console.log(event);
     if (!isEditable) {
       return;
     }
diff --git a/rsconcept/frontend/src/pages/RSFormPage/RSTabs.tsx b/rsconcept/frontend/src/pages/RSFormPage/RSTabs.tsx
index 50365724..7be5de4b 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/RSTabs.tsx
+++ b/rsconcept/frontend/src/pages/RSFormPage/RSTabs.tsx
@@ -36,8 +36,8 @@ function RSTabs() {
   const navigate = useNavigate();
   const search = useLocation().search;
   const { 
-    error, schema, loading, claim, download,
-    cstCreate, cstDelete, cstRename
+    error, schema, loading, claim, download, isTracking,
+    cstCreate, cstDelete, cstRename, subscribe, unsubscribe
   } = useRSForm();
   const { destroySchema } = useLibrary();
 
@@ -224,6 +224,21 @@ function RSTabs() {
       }
     });
   }, [schema?.alias, download]);
+  
+  const handleToggleSubscribe = useCallback(
+  () => {
+    if (isTracking) {
+      unsubscribe(
+        () => {
+          toast.success('Отслеживание отключено');
+        });
+    } else {
+      subscribe(
+        () => {
+          toast.success('Отслеживание включено');
+        });
+    }
+  }, [isTracking, subscribe, unsubscribe]);
 
   return (
   <div className='w-full'>
@@ -274,6 +289,7 @@ function RSTabs() {
           onDestroy={onDestroySchema}
           onClaim={onClaimSchema}
           onShare={onShareSchema}
+          onToggleSubscribe={handleToggleSubscribe}
           showCloneDialog={() => setShowClone(true)} 
           showUploadDialog={() => setShowUpload(true)} 
         />
diff --git a/rsconcept/frontend/src/pages/RSFormPage/RSTabsMenu.tsx b/rsconcept/frontend/src/pages/RSFormPage/RSTabsMenu.tsx
index f39f08a8..70b675af 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/RSTabsMenu.tsx
+++ b/rsconcept/frontend/src/pages/RSFormPage/RSTabsMenu.tsx
@@ -16,17 +16,18 @@ interface RSTabsMenuProps {
   onClaim: () => void
   onShare: () => void
   onDownload: () => void
+  onToggleSubscribe: () => void
 }
 
 function RSTabsMenu({
   showUploadDialog, showCloneDialog,
-  onDestroy, onShare, onDownload, onClaim
+  onDestroy, onShare, onDownload, onClaim, onToggleSubscribe
 }: RSTabsMenuProps) {
   const navigate = useNavigate();
   const { user } = useAuth();
   const {
-    isOwned, isEditable, isTracking, isReadonly: readonly, isForceAdmin: forceAdmin,
-    toggleTracking, toggleForceAdmin, toggleReadonly
+    isOwned, isEditable, isTracking, isReadonly, isClaimable, isForceAdmin,
+    toggleForceAdmin, toggleReadonly, processing
   } = useRSForm();
   const schemaMenu = useDropdown();
   const editMenu = useDropdown();
@@ -127,7 +128,11 @@ function RSTabsMenu({
         />
         { editMenu.isActive &&
         <Dropdown>
-          <DropdownButton disabled={!user} onClick={!isOwned ? handleClaimOwner : undefined}>
+          <DropdownButton 
+            disabled={!user || !isClaimable}
+            onClick={!isOwned ? handleClaimOwner : undefined}
+            description={!user || !isClaimable ? 'Стать владельцем можно только для общей небиблиотечной схемы' : ''}
+          >
             <div className='inline-flex items-center gap-1 justify-normal'>
               <span className={isOwned ? 'text-green' : ''}><CrownIcon size={4} /></span>
               <p>
@@ -139,20 +144,21 @@ function RSTabsMenu({
           {(isOwned || user?.is_staff) &&
           <DropdownButton onClick={toggleReadonly}>
             <Checkbox 
-              value={readonly}
+              value={isReadonly}
               label='Я — читатель!'
               tooltip='Режим чтения'
             />
           </DropdownButton>}
           {user?.is_staff &&
           <DropdownButton onClick={toggleForceAdmin}>
-            <Checkbox value={forceAdmin} label='режим администратора'/>
+            <Checkbox value={isForceAdmin} label='режим администратора'/>
           </DropdownButton>}
         </Dropdown>}
       </div>
       <div>
         <Button
           tooltip={'отслеживание: ' + (isTracking ? '[включено]' : '[выключено]')}
+          disabled={processing}
           icon={isTracking
             ? <EyeIcon color='text-primary' size={5}/>
             : <EyeOffIcon size={5}/>
@@ -160,7 +166,7 @@ function RSTabsMenu({
           widthClass='h-full w-fit'
           borderClass=''
           dense
-          onClick={toggleTracking}
+          onClick={onToggleSubscribe}
           />
       </div>
     </div>
diff --git a/rsconcept/frontend/src/pages/UserProfilePage/ChangePassword.tsx b/rsconcept/frontend/src/pages/UserProfilePage/EditorPassword.tsx
similarity index 51%
rename from rsconcept/frontend/src/pages/UserProfilePage/ChangePassword.tsx
rename to rsconcept/frontend/src/pages/UserProfilePage/EditorPassword.tsx
index 7642d7fd..342c4348 100644
--- a/rsconcept/frontend/src/pages/UserProfilePage/ChangePassword.tsx
+++ b/rsconcept/frontend/src/pages/UserProfilePage/EditorPassword.tsx
@@ -1,75 +1,90 @@
-import { useMemo, useState } from 'react';
+import { useEffect, useMemo, useState } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { toast } from 'react-toastify';
 
 import BackendError from '../../components/BackendError';
+import SubmitButton from '../../components/Common/SubmitButton';
 import TextInput from '../../components/Common/TextInput';
 import { useAuth } from '../../context/AuthContext';
 import { IUserUpdatePassword } from '../../utils/models';
 
 
-export function ChangePassword() {
-  const { updatePassword, error, loading } = useAuth();
+function EditorPassword() {
+  const { updatePassword, error, setError, loading } = useAuth();
     
   const [oldPassword, setOldPassword] = useState('');
   const [newPassword, setNewPassword] = useState('');
   const [newPasswordRepeat, setNewPasswordRepeat] = useState('');
   const navigate = useNavigate();
 
-  const colorClass = useMemo(() => {
-    return !!newPassword && !!newPasswordRepeat && newPassword !== newPasswordRepeat ? 'bg-red-500' : 'clr-input';
+  const passwordColor = useMemo(
+  () => {
+    return !!newPassword && !!newPasswordRepeat && newPassword !== newPasswordRepeat ? 'clr-input-red' : 'clr-input';
   }, [newPassword, newPasswordRepeat]);
+
+  const canSubmit = useMemo(
+    () => {
+      return !!oldPassword && !!newPassword && !!newPasswordRepeat && newPassword === newPasswordRepeat;
+    }, [newPassword, newPasswordRepeat, oldPassword]);
   
   function handleSubmit(event: React.FormEvent<HTMLFormElement>) {
     event.preventDefault();
     if (newPassword !== newPasswordRepeat) {
       toast.error('Пароли не совпадают');
+      return;
     }
-    else {
     const data: IUserUpdatePassword = {
       old_password: oldPassword,
       new_password: newPassword,
     };
-    updatePassword(data, () => {toast.success('Изменения сохранены'); navigate('/login')});
-   }
+    updatePassword(data, () => {
+      toast.success('Изменения сохранены');
+      navigate('/login')
+    });
   }
 
+  useEffect(() => {
+    setError(undefined);
+  }, [newPassword, oldPassword, newPasswordRepeat, setError]);
+
   return (
-    <div className='flex max-w-sm px-4 border-l-2'>
-      <form onSubmit={handleSubmit} className='flex flex-col justify-between px-6 min-w-fit '>
+    <div className='flex py-2 border-l-2 clr-border max-w-[14rem]'>
+      <form onSubmit={handleSubmit} className='flex flex-col justify-between px-6 min-w-fit'>
         <div>
           <TextInput id='old_password'
             type='password' 
-            label='Введите старый пароль:'
+            label='Старый пароль'
             value={oldPassword}
             onChange={event => setOldPassword(event.target.value)}
           />
-          <TextInput id='new_password'
-            colorClass={colorClass}
-            label="Введите новый пароль:"
+          <TextInput id='new_password' type='password' 
+            colorClass={passwordColor}
+            label="Новый пароль"
             value={newPassword}
             onChange={event => {
               setNewPassword(event.target.value); 
             }}
           />
-          <TextInput id='new_password_repeat'
-            colorClass={colorClass}
-            label="Повторите новый пароль:"
+          <TextInput id='new_password_repeat' type='password' 
+            colorClass={passwordColor}
+            label="Повторите новый"
             value={newPasswordRepeat}
             onChange={event => {
               setNewPasswordRepeat(event.target.value); 
             }}
           />          
         </div>
-          { error && <BackendError error={error} />}
-        <div className='flex justify-center py-4'>
-          <button 
-            type='submit' 
-            className={`px-2 py-1 border clr-btn-blue`}
-            disabled={loading}>
-              <span>Сменить пароль</span>
-          </button>
+        { error && <BackendError error={error} />}
+        <div className='flex justify-center w-full'>
+          <SubmitButton
+            disabled={!canSubmit}
+            loading={loading}
+            text='Сменить пароль'
+          />
         </div>
       </form>
     </div>   
-  )}
+  )
+}
+
+export default EditorPassword;
diff --git a/rsconcept/frontend/src/pages/UserProfilePage/EditorProfile.tsx b/rsconcept/frontend/src/pages/UserProfilePage/EditorProfile.tsx
new file mode 100644
index 00000000..4e40a906
--- /dev/null
+++ b/rsconcept/frontend/src/pages/UserProfilePage/EditorProfile.tsx
@@ -0,0 +1,68 @@
+import { useLayoutEffect, useState } from 'react';
+import { toast } from 'react-toastify';
+
+import SubmitButton from '../../components/Common/SubmitButton';
+import TextInput from '../../components/Common/TextInput';
+import { useUserProfile } from '../../context/UserProfileContext';
+import { IUserUpdateData } from '../../utils/models';
+
+function EditorProfile() {
+  const { updateUser, user, processing } = useUserProfile();
+  
+  const [username, setUsername] = useState('');
+  const [email, setEmail] = useState('');
+  const [first_name, setFirstName] = useState('');
+  const [last_name, setLastName] = useState('');
+
+  useLayoutEffect(() => {
+    if (user) {
+      setUsername(user.username);
+      setEmail(user.email);
+      setFirstName(user.first_name);
+      setLastName(user.last_name);
+    }
+  }, [user]);
+  
+  function handleSubmit(event: React.FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    const data: IUserUpdateData = {
+      username: username,
+      email: email,
+      first_name: first_name,
+      last_name: last_name,
+    };
+    updateUser(data, () => toast.success('Изменения сохранены'));
+  }
+
+  return (
+    <div className='flex py-2'>
+      <form onSubmit={handleSubmit} className='px-6 min-w-[18rem]'>
+        <div>
+          <TextInput id='username' 
+            label='Логин'
+            tooltip='Логин изменить нельзя'
+            disabled={true}
+            value={username}
+            onChange={event => setUsername(event.target.value)}
+          />
+          <TextInput id='first_name'
+            label="Имя"
+            value={first_name}
+            onChange={event => setFirstName(event.target.value)}
+          />
+          <TextInput id='last_name' label="Фамилия" value={last_name} onChange={event => setLastName(event.target.value)}/>
+          <TextInput id='email' label="Электронная почта" value={email} onChange={event => setEmail(event.target.value)}/>
+        </div>  
+        <div className='flex justify-center w-full mt-10'>
+          <SubmitButton
+            text='Сохранить данные'
+            loading={processing}
+          />
+        </div>  
+      </form>   
+    </div>
+  )
+}
+
+  export default EditorProfile;
+  
\ No newline at end of file
diff --git a/rsconcept/frontend/src/pages/UserProfilePage/UserProfile.tsx b/rsconcept/frontend/src/pages/UserProfilePage/UserProfile.tsx
deleted file mode 100644
index 53b5d1fa..00000000
--- a/rsconcept/frontend/src/pages/UserProfilePage/UserProfile.tsx
+++ /dev/null
@@ -1,74 +0,0 @@
-import { useLayoutEffect, useState } from 'react';
-import { toast } from 'react-toastify';
-
-import TextInput from '../../components/Common/TextInput';
-import { useUserProfile } from '../../context/UserProfileContext';
-import { IUserUpdateData } from '../../utils/models';
-import { ChangePassword } from './ChangePassword';
-
-
-export function UserProfile() {
-  const { updateUser, user, processing } = useUserProfile();
-  
-  const [username, setUsername] = useState('');
-  const [email, setEmail] = useState('');
-  const [first_name, setFirstName] = useState('');
-  const [last_name, setLastName] = useState('');
-
-  useLayoutEffect(() => {
-    if (user) {
-      setUsername(user.username);
-      setEmail(user.email);
-      setFirstName(user.first_name);
-      setLastName(user.last_name);
-    }
-  }, [user]);
-  
-  function handleSubmit(event: React.FormEvent<HTMLFormElement>) {
-    event.preventDefault();
-    const data: IUserUpdateData = {
-      username: username,
-      email: email,
-      first_name: first_name,
-      last_name: last_name,
-    };
-    updateUser(data, () => toast.success('Изменения сохранены'));
-  }
-
-  return (
-    <div className='flex justify-center'>
-      <div className='place-self-center'>
-        <h1 className='flex justify-center py-2'> Учетные данные пользователя </h1>
-        <div className='flex justify-center px-6 py-2 max-w-fit'>
-          <div className='flex max-w-sm px-4'>
-            <form onSubmit={handleSubmit} className='px-6 min-w-fit'>
-              <div>
-                <TextInput id='username' 
-                  label='Логин:'
-                  value={username}
-                  onChange={event => setUsername(event.target.value)}
-                />
-                <TextInput id='first_name'
-                  label="Имя:"
-                  value={first_name}
-                  onChange={event => setFirstName(event.target.value)}
-                />
-                <TextInput id='last_name' label="Фамилия:" value={last_name} onChange={event => setLastName(event.target.value)}/>
-                <TextInput id='email' label="Электронная почта:" value={email} onChange={event => setEmail(event.target.value)}/>
-              </div>  
-              <div className='flex justify-center px-0 py-4'>
-                <button 
-                  type='submit' 
-                  className={`px-2 py-1 border clr-btn-green`}
-                  
-                  disabled={processing}>
-                    <span>Сохранить мои данные</span>
-                </button>
-              </div>  
-            </form>   
-          </div>
-          <ChangePassword /> 
-        </div>   
-      </div>
-    </div>
-  )}
diff --git a/rsconcept/frontend/src/pages/UserProfilePage/UserTabs.tsx b/rsconcept/frontend/src/pages/UserProfilePage/UserTabs.tsx
index 5c4a9535..a4a3f2e5 100644
--- a/rsconcept/frontend/src/pages/UserProfilePage/UserTabs.tsx
+++ b/rsconcept/frontend/src/pages/UserProfilePage/UserTabs.tsx
@@ -1,16 +1,60 @@
+import { useMemo, useState } from 'react';
+
 import BackendError from '../../components/BackendError';
 import { Loader } from '../../components/Common/Loader';
+import MiniButton from '../../components/Common/MiniButton';
+import { EyeIcon, EyeOffIcon } from '../../components/Icons';
+import { useAuth } from '../../context/AuthContext';
+import { useLibrary } from '../../context/LibraryContext';
 import { useUserProfile } from '../../context/UserProfileContext';
-import { UserProfile } from './UserProfile';
+import EditorPassword from './EditorPassword';
+import EditorProfile from './EditorProfile';
+import ViewSubscriptions from './ViewSubscriptions';
 
 function UserTabs() {
   const { user, error, loading } = useUserProfile();
+  const { user: auth } = useAuth();
+  const { items } = useLibrary();
+
+  const [showSubs, setShowSubs] = useState(true);
+
+  const subscriptions = useMemo(
+  () => {
+    return items.filter(item => auth?.subscriptions.includes(item.id));
+  }, [auth, items]);
 
   return (
     <div className='w-full'>
       { loading && <Loader /> }
       { error && <BackendError error={error} />}
-      { user && <UserProfile /> }
+      { user && 
+      <div className='flex justify-center gap-2 py-2'>
+        <div className='flex flex-col gap-2 min-w-max'>
+          <div className='relative w-full'>
+            <div className='absolute top-0 right-0 mt-2'>
+              <MiniButton
+                tooltip='Показать/Скрыть список отслеживаний'
+                icon={showSubs
+                  ? <EyeIcon color='text-primary' size={5}/>
+                  : <EyeOffIcon color='text-primary' size={5}/>
+                }
+                onClick={() => setShowSubs(prev => !prev)}
+              />
+            </div>
+          </div>
+          <h1>Учетные данные пользователя</h1>
+          <div className='flex justify-center py-2 max-w-fit'>
+            <EditorProfile />
+            <EditorPassword />
+          </div>   
+        </div>
+        {subscriptions.length > 0 && showSubs &&
+        <div className='flex flex-col w-full gap-2 pl-4'>
+          <h1>Отслеживаемые схемы</h1>
+          <ViewSubscriptions items={subscriptions} />
+        </div>}
+      </div>
+      }
     </div>
   );
 }
diff --git a/rsconcept/frontend/src/pages/UserProfilePage/ViewSubscriptions.tsx b/rsconcept/frontend/src/pages/UserProfilePage/ViewSubscriptions.tsx
new file mode 100644
index 00000000..2422a488
--- /dev/null
+++ b/rsconcept/frontend/src/pages/UserProfilePage/ViewSubscriptions.tsx
@@ -0,0 +1,67 @@
+import { useMemo } from 'react';
+import { useIntl } from 'react-intl';
+import { useNavigate } from 'react-router-dom';
+
+import ConceptDataTable from '../../components/Common/ConceptDataTable';
+import { ILibraryItem } from '../../utils/models';
+
+interface ViewSubscriptionsProps {
+  items: ILibraryItem[]
+}
+
+function ViewSubscriptions({items}: ViewSubscriptionsProps) {
+  const navigate = useNavigate();
+  const intl = useIntl();
+
+  const openRSForm = (item: ILibraryItem) => navigate(`/rsforms/${item.id}`);
+
+  const columns = useMemo(() =>
+  [
+    {
+      name: 'Шифр',
+      id: 'alias',
+      maxWidth: '140px',
+      selector: (item: ILibraryItem) => item.alias,
+      sortable: true,
+      reorder: true
+    },
+    {
+      name: 'Название',
+      id: 'title',
+      minWidth: '50%',
+      selector: (item: ILibraryItem) => item.title,
+      sortable: true,
+      reorder: true
+    },
+    {
+      name: 'Обновлена',
+      id: 'time_update',
+      selector: (item: ILibraryItem) => item.time_update,
+      format: (item: ILibraryItem) => new Date(item.time_update).toLocaleString(intl.locale),
+      sortable: true,
+      reorder: true
+    }
+  ], [intl]);
+
+  return (
+    <ConceptDataTable
+      className='h-full overflow-auto border clr-border'
+      columns={columns}
+      data={items}
+      defaultSortFieldId='time_update'
+      defaultSortAsc={false}
+
+      noDataComponent={
+        <div className='h-[10rem]'>Отслеживаемые схемы отсутствуют</div>
+      }
+
+      striped
+      dense
+      highlightOnHover
+      pointerOnHover
+      onRowClicked={openRSForm}
+    />
+  )
+}
+
+export default ViewSubscriptions;
diff --git a/rsconcept/frontend/src/utils/backendAPI.ts b/rsconcept/frontend/src/utils/backendAPI.ts
index 79cc366d..c40712bb 100644
--- a/rsconcept/frontend/src/utils/backendAPI.ts
+++ b/rsconcept/frontend/src/utils/backendAPI.ts
@@ -118,7 +118,7 @@ export function getActiveUsers(request: FrontPull<IUserInfo[]>) {
 export function getLibrary(request: FrontPull<ILibraryItem[]>) {
   AxiosGet({
     title: 'Available RSForms (Library) list',
-    endpoint: '/api/library/active/',
+    endpoint: '/api/library/active',
     request: request
   });
 }
@@ -126,7 +126,7 @@ export function getLibrary(request: FrontPull<ILibraryItem[]>) {
 export function postNewRSForm(request: FrontExchange<IRSFormCreateData, ILibraryItem>) {
   AxiosPost({
     title: 'New RSForm',
-    endpoint: '/api/rsforms/create-detailed/',
+    endpoint: '/api/rsforms/create-detailed',
     request: request,
     options: {
       headers: {
@@ -139,7 +139,7 @@ export function postNewRSForm(request: FrontExchange<IRSFormCreateData, ILibrary
 export function postCloneLibraryItem(target: string, request: FrontExchange<IRSFormCreateData, IRSFormData>) {
   AxiosPost({
     title: 'clone RSForm',
-    endpoint: `/api/library/${target}/clone/`,
+    endpoint: `/api/library/${target}/clone`,
     request: request
   });
 }
@@ -147,7 +147,7 @@ export function postCloneLibraryItem(target: string, request: FrontExchange<IRSF
 export function getRSFormDetails(target: string, request: FrontPull<IRSFormData>) {
   AxiosGet({
     title: `RSForm details for id=${target}`,
-    endpoint: `/api/rsforms/${target}/details/`,
+    endpoint: `/api/rsforms/${target}/details`,
     request: request
   });
 }
@@ -155,7 +155,7 @@ export function getRSFormDetails(target: string, request: FrontPull<IRSFormData>
 export function patchLibraryItem(target: string, request: FrontExchange<ILibraryUpdateData, ILibraryItem>) {
   AxiosPatch({
     title: `RSForm id=${target}`,
-    endpoint: `/api/library/${target}/`,
+    endpoint: `/api/library/${target}`,
     request: request
   });
 }
@@ -163,7 +163,7 @@ export function patchLibraryItem(target: string, request: FrontExchange<ILibrary
 export function deleteLibraryItem(target: string, request: FrontAction) {
   AxiosDelete({
     title: `RSForm id=${target}`,
-    endpoint: `/api/library/${target}/`,
+    endpoint: `/api/library/${target}`,
     request: request
   });
 }
@@ -171,7 +171,23 @@ export function deleteLibraryItem(target: string, request: FrontAction) {
 export function postClaimLibraryItem(target: string, request: FrontPull<ILibraryItem>) {
   AxiosPost({
     title: `Claim on RSForm id=${target}`,
-    endpoint: `/api/library/${target}/claim/`,
+    endpoint: `/api/library/${target}/claim`,
+    request: request
+  });
+}
+
+export function postSubscribe(target: string, request: FrontAction) {
+  AxiosPost({
+    title: `Claim on RSForm id=${target}`,
+    endpoint: `/api/library/${target}/subscribe`,
+    request: request
+  });
+}
+
+export function deleteUnsubscribe(target: string, request: FrontAction) {
+  AxiosDelete({
+    title: `Claim on RSForm id=${target}`,
+    endpoint: `/api/library/${target}/unsubscribe`,
     request: request
   });
 }
@@ -179,7 +195,7 @@ export function postClaimLibraryItem(target: string, request: FrontPull<ILibrary
 export function getTRSFile(target: string, request: FrontPull<Blob>) {
   AxiosGet({
     title: `RSForm TRS file for id=${target}`,
-    endpoint: `/api/rsforms/${target}/export-trs/`,
+    endpoint: `/api/rsforms/${target}/export-trs`,
     request: request,
     options: { responseType: 'blob' }
   });
@@ -188,7 +204,7 @@ export function getTRSFile(target: string, request: FrontPull<Blob>) {
 export function postNewConstituenta(schema: string, request: FrontExchange<ICstCreateData, ICstCreatedResponse>) {
   AxiosPost({
     title: `New Constituenta for RSForm id=${schema}: ${request.data.alias}`,
-    endpoint: `/api/rsforms/${schema}/cst-create/`,
+    endpoint: `/api/rsforms/${schema}/cst-create`,
     request: request
   });
 }
@@ -196,7 +212,7 @@ export function postNewConstituenta(schema: string, request: FrontExchange<ICstC
 export function patchDeleteConstituenta(schema: string, request: FrontExchange<IConstituentaList, IRSFormData>) {
   AxiosPatch({
     title: `Delete Constituents for RSForm id=${schema}: ${request.data.items.map(item => String(item.id)).join(' ')}`,
-    endpoint: `/api/rsforms/${schema}/cst-multidelete/`,
+    endpoint: `/api/rsforms/${schema}/cst-multidelete`,
     request: request
   });
 }
@@ -204,7 +220,7 @@ export function patchDeleteConstituenta(schema: string, request: FrontExchange<I
 export function patchConstituenta(target: string, request: FrontExchange<ICstUpdateData, IConstituentaMeta>) {
   AxiosPatch({
     title: `Constituenta id=${target}`,
-    endpoint: `/api/constituents/${target}/`,
+    endpoint: `/api/constituents/${target}`,
     request: request
   });
 }
@@ -212,7 +228,7 @@ export function patchConstituenta(target: string, request: FrontExchange<ICstUpd
 export function patchRenameConstituenta(schema: string, request: FrontExchange<ICstRenameData, ICstCreatedResponse>) {
   AxiosPatch({
     title: `Renaming constituenta id=${request.data.id} for schema id=${schema}`,
-    endpoint: `/api/rsforms/${schema}/cst-rename/`,
+    endpoint: `/api/rsforms/${schema}/cst-rename`,
     request: request
   });
 }
@@ -220,7 +236,7 @@ export function patchRenameConstituenta(schema: string, request: FrontExchange<I
 export function patchMoveConstituenta(schema: string, request: FrontExchange<ICstMovetoData, IRSFormData>) {
   AxiosPatch({
     title: `Moving Constituents for RSForm id=${schema}: ${JSON.stringify(request.data.items)} to ${request.data.move_to}`,
-    endpoint: `/api/rsforms/${schema}/cst-moveto/`,
+    endpoint: `/api/rsforms/${schema}/cst-moveto`,
     request: request
   });
 }
@@ -228,7 +244,7 @@ export function patchMoveConstituenta(schema: string, request: FrontExchange<ICs
 export function postCheckExpression(schema: string, request: FrontExchange<IRSExpression, IExpressionParse>) {
   AxiosPost({
     title: `Check expression for RSForm id=${schema}: ${request.data.expression }`,
-    endpoint: `/api/rsforms/${schema}/check/`,
+    endpoint: `/api/rsforms/${schema}/check`,
     request: request
   });
 }
@@ -236,7 +252,7 @@ export function postCheckExpression(schema: string, request: FrontExchange<IRSEx
 export function postResolveText(schema: string, request: FrontExchange<IRefsText, IReferenceData>) {
   AxiosPost({
     title: `Resolve text references for RSForm id=${schema}: ${request.data.text }`,
-    endpoint: `/api/rsforms/${schema}/resolve/`,
+    endpoint: `/api/rsforms/${schema}/resolve`,
     request: request
   });
 }
@@ -244,7 +260,7 @@ export function postResolveText(schema: string, request: FrontExchange<IRefsText
 export function patchResetAliases(target: string, request: FrontPull<IRSFormData>) {
   AxiosPatch({
     title: `Reset alias for RSForm id=${target}`,
-    endpoint: `/api/rsforms/${target}/reset-aliases/`,
+    endpoint: `/api/rsforms/${target}/reset-aliases`,
     request: request
   });
 }
@@ -252,7 +268,7 @@ export function patchResetAliases(target: string, request: FrontPull<IRSFormData
 export function patchUploadTRS(target: string, request: FrontExchange<IRSFormUploadData, IRSFormData>) {
   AxiosPatch({
     title: `Replacing data with trs file for RSForm id=${target}`,
-    endpoint: `/api/rsforms/${target}/load-trs/`,
+    endpoint: `/api/rsforms/${target}/load-trs`,
     request: request,
     options: {
       headers: {
diff --git a/rsconcept/frontend/src/utils/constants.ts b/rsconcept/frontend/src/utils/constants.ts
index dd35bb24..933b6e94 100644
--- a/rsconcept/frontend/src/utils/constants.ts
+++ b/rsconcept/frontend/src/utils/constants.ts
@@ -34,4 +34,5 @@ export const prefixes = {
   cst_list: 'cst-list-',
   cst_status_list: 'cst-status-list-',
   topic_list: 'topic-list-',
+  library_list: 'library-list-'
 }
diff --git a/rsconcept/frontend/src/utils/models.ts b/rsconcept/frontend/src/utils/models.ts
index 6e7a3ef2..763d60f4 100644
--- a/rsconcept/frontend/src/utils/models.ts
+++ b/rsconcept/frontend/src/utils/models.ts
@@ -11,7 +11,9 @@ export interface IUser {
   last_name: string
 }
 
-export interface ICurrentUser extends Pick<IUser, 'id' | 'username' | 'is_staff'> {}
+export interface ICurrentUser extends Pick<IUser, 'id' | 'username' | 'is_staff'> {
+  subscriptions: number[]
+}
 
 export interface IUserLoginData extends Pick<IUser, 'username'> {
   password: string
@@ -261,6 +263,7 @@ extends ILibraryItem {
   items: IConstituenta[]
   stats: IRSFormStats
   graph: Graph
+  subscribers: number[]
 }
 
 export interface IRSFormData extends Omit<IRSForm, 'stats' | 'graph'> {}