Diff
1diff --git a/server/backend/sqlite/sql.go b/server/backend/sqlite/sql.go
2index 719c0707711133ded792eb02d6c1f807311cbbcd..34edd17f72485256186c2f7267e14da0661c437b 100644
3--- a/server/backend/sqlite/sql.go
4+++ b/server/backend/sqlite/sql.go
5@@ -20,7 +20,7 @@ var (
6 sqlCreatePublicKeyTable = `CREATE TABLE IF NOT EXISTS public_key (
7 id INTEGER PRIMARY KEY AUTOINCREMENT,
8 user_id INTEGER NOT NULL,
9- public_key TEXT NOT NULL,
10+ public_key TEXT NOT NULL UNIQUE,
11 created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
12 updated_at DATETIME NOT NULL,
13 UNIQUE (user_id, public_key),