diff --git a/migrations/postgres/000016_pairs_created_at.down.sql b/migrations/postgres/000016_pairs_created_at.down.sql
new file mode 100644
index 0000000..7326fc4
--- /dev/null
+++ b/migrations/postgres/000016_pairs_created_at.down.sql
@@ -0,0 +1 @@
+ALTER TABLE pairs DROP COLUMN created_at;
diff --git a/migrations/postgres/000016_pairs_created_at.up.sql b/migrations/postgres/000016_pairs_created_at.up.sql
new file mode 100644
index 0000000..400d416
--- /dev/null
+++ b/migrations/postgres/000016_pairs_created_at.up.sql
@@ -0,0 +1 @@
+ALTER TABLE pairs ADD COLUMN created_at BIGINT NOT NULL DEFAULT 0;
diff --git a/migrations/sqlite/000016_pairs_created_at.down.sql b/migrations/sqlite/000016_pairs_created_at.down.sql
new file mode 100644
index 0000000..7326fc4
--- /dev/null
+++ b/migrations/sqlite/000016_pairs_created_at.down.sql
@@ -0,0 +1 @@
+ALTER TABLE pairs DROP COLUMN created_at;
diff --git a/migrations/sqlite/000016_pairs_created_at.up.sql b/migrations/sqlite/000016_pairs_created_at.up.sql
new file mode 100644
index 0000000..d2af423
--- /dev/null
+++ b/migrations/sqlite/000016_pairs_created_at.up.sql
@@ -0,0 +1 @@
+ALTER TABLE pairs ADD COLUMN created_at INTEGER NOT NULL DEFAULT 0;
diff --git a/postgres.go b/postgres.go
index 24d8fa2..04be02d 100644
--- a/postgres.go
+++ b/postgres.go
@@ -64,8 +64,8 @@ func (r *pgRepo) Register(key, platform string, chatID int64) (bool, string, err
 	}
 
 	_, err = r.db.Exec(
-		"INSERT INTO pairs (tg_chat_id, max_chat_id, prefix) VALUES ($1, $2, 0) ON CONFLICT (tg_chat_id, max_chat_id) DO NOTHING",
-		tgID, maxID)
+		"INSERT INTO pairs (tg_chat_id, max_chat_id, prefix, created_at) VALUES ($1, $2, 0, $3) ON CONFLICT (tg_chat_id, max_chat_id) DO NOTHING",
+		tgID, maxID, time.Now().Unix())
 	return true, "", err
 }
 
diff --git a/sqlite.go b/sqlite.go
index 031c602..93cc3e1 100644
--- a/sqlite.go
+++ b/sqlite.go
@@ -60,7 +60,10 @@ func (r *sqliteRepo) Register(key, platform string, chatID int64) (bool, string,
 		tgID, maxID = peerChatID, chatID
 	}
 
-	_, err = r.db.Exec("INSERT OR REPLACE INTO pairs (tg_chat_id, max_chat_id, prefix) VALUES (?, ?, 0)", tgID, maxID)
+	_, err = r.db.Exec(
+		`INSERT INTO pairs (tg_chat_id, max_chat_id, prefix, created_at) VALUES (?, ?, 0, ?)
+		 ON CONFLICT(tg_chat_id, max_chat_id) DO UPDATE SET prefix = 0`,
+		tgID, maxID, time.Now().Unix())
 	return true, "", err
 }