diff --git a/olgram/migrations/models/1_20210909220512_update.sql b/olgram/migrations/models/1_20210909220512_update.sql
deleted file mode 100644
index 646bf76..0000000
--- a/olgram/migrations/models/1_20210909220512_update.sql
+++ /dev/null
@@ -1,5 +0,0 @@
--- upgrade --
-CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
-ALTER TABLE "bot" ADD "code" UUID NOT NULL DEFAULT uuid_generate_v4();
--- downgrade --
-ALTER TABLE "bot" DROP COLUMN "code";
diff --git a/olgram/migrations/models/0_20210711121349_init.sql b/olgram/migrations/models/1_20210911011051_None.sql
similarity index 84%
rename from olgram/migrations/models/0_20210711121349_init.sql
rename to olgram/migrations/models/1_20210911011051_None.sql
index e78e993..ed1cf82 100644
--- a/olgram/migrations/models/0_20210711121349_init.sql
+++ b/olgram/migrations/models/1_20210911011051_None.sql
@@ -14,10 +14,12 @@ CREATE TABLE IF NOT EXISTS "bot" (
     "id" SERIAL NOT NULL PRIMARY KEY,
     "token" VARCHAR(50) NOT NULL UNIQUE,
     "name" VARCHAR(33) NOT NULL,
+    "code" UUID NOT NULL,
     "start_text" TEXT NOT NULL,
-    "group_chat_id" INT REFERENCES "group_chat" ("id") ON DELETE SET NULL,
+    "group_chat_id" INT REFERENCES "group_chat" ("id") ON DELETE CASCADE,
     "owner_id" INT NOT NULL REFERENCES "user" ("id") ON DELETE CASCADE
 );
+CREATE INDEX IF NOT EXISTS "idx_bot_code_a43015" ON "bot" ("code");
 CREATE TABLE IF NOT EXISTS "aerich" (
     "id" SERIAL NOT NULL PRIMARY KEY,
     "version" VARCHAR(255) NOT NULL,
@@ -25,6 +27,6 @@ CREATE TABLE IF NOT EXISTS "aerich" (
     "content" JSONB NOT NULL
 );
 CREATE TABLE IF NOT EXISTS "bot_group_chat" (
-    "bot_id" INT NOT NULL REFERENCES "bot" ("id") ON DELETE SET NULL,
-    "groupchat_id" INT NOT NULL REFERENCES "group_chat" ("id") ON DELETE SET NULL
+    "bot_id" INT NOT NULL REFERENCES "bot" ("id") ON DELETE CASCADE,
+    "groupchat_id" INT NOT NULL REFERENCES "group_chat" ("id") ON DELETE CASCADE
 );
diff --git a/olgram/models/models.py b/olgram/models/models.py
index 735196e..16bd2fa 100644
--- a/olgram/models/models.py
+++ b/olgram/models/models.py
@@ -15,9 +15,10 @@ class Bot(Model):
     Напишите ваш вопрос и мы ответим вам в ближайшее время.
     """))
 
-    group_chats = fields.ManyToManyField("models.GroupChat", related_name="bots", on_delete=fields.relational.SET_NULL)
+    group_chats = fields.ManyToManyField("models.GroupChat", related_name="bots", on_delete=fields.relational.CASCADE,
+                                         null=True)
     group_chat = fields.ForeignKeyField("models.GroupChat", related_name="active_bots",
-                                        on_delete=fields.relational.SET_NULL,
+                                        on_delete=fields.relational.CASCADE,
                                         null=True)
 
     async def super_chat_id(self):