diff --git a/server/migrations/008_nostr.sql b/server/migrations/008_nostr.sql
index eb98676..84692e8 100644
--- a/server/migrations/008_nostr.sql
+++ b/server/migrations/008_nostr.sql
@@ -1 +1,2 @@
-ALTER TABLE users ADD COLUMN nostr_pubkey TEXT UNIQUE;
+ALTER TABLE users ADD COLUMN nostr_pubkey TEXT;
+CREATE UNIQUE INDEX IF NOT EXISTS idx_users_nostr_pubkey ON users(nostr_pubkey);