diff --git a/tg/tg_database.py b/tg/tg_database.py
index dc8c050..3762028 100644
--- a/tg/tg_database.py
+++ b/tg/tg_database.py
@@ -50,7 +50,6 @@ class TgDatabase(database.BasicDatabase):
             role VARCHAR(16) NOT NULL,
             text VARCHAR(4000),
             image MEDIUMBLOB,
-            UNIQUE KEY contexts_unique (bot_id, chat_id, message_id),
             CONSTRAINT fk_contexts_chats FOREIGN KEY (bot_id, chat_id) REFERENCES chats (bot_id, chat_id) ON UPDATE CASCADE ON DELETE CASCADE)
         """)
 
diff --git a/vk/vk_database.py b/vk/vk_database.py
index 5d169bc..96543f3 100644
--- a/vk/vk_database.py
+++ b/vk/vk_database.py
@@ -53,7 +53,6 @@ class VkDatabase(database.BasicDatabase):
             role VARCHAR(16) NOT NULL,
             text VARCHAR(4000),
             image MEDIUMBLOB,
-            UNIQUE KEY contexts_unique (bot_id, chat_id, message_id),
             CONSTRAINT fk_contexts_chats FOREIGN KEY (bot_id, chat_id) REFERENCES chats (bot_id, chat_id) ON UPDATE CASCADE ON DELETE CASCADE)
         """)