fix: better index for config.user_handle on identity_credentials

persistence/sql/identity/persister_identity.go

@@ -267,9 +267,9 @@ INNER JOIN identity_credentials
         FROM identity_credential_types
         WHERE name = ?
      )
-WHERE identity_credentials.config ->> '%s' = ?
+WHERE identity_credentials.config ->> '%s' = ? AND identity_credentials.config ->> '%s' IS NOT NULL
   AND identities.nid = ?
-LIMIT 1`, jsonPath),
+LIMIT 1`, jsonPath, jsonPath),
 		identity.CredentialsTypeWebAuthn,
 		base64.StdEncoding.EncodeToString(userHandle),
 		p.NetworkID(ctx),

persistence/sql/migrations/sql/20240425095000000000_identity_credentials_fix_user_handle_index.cockroach.down.sql

@@ -0,0 +1,5 @@
+DROP INDEX identity_credentials_config_user_handle_idx;
+
+CREATE INVERTED INDEX identity_credentials_user_handle_idx
+    ON identity_credentials (config)
+    WHERE config ->> 'user_handle' IS NOT NULL;

persistence/sql/migrations/sql/20240425095000000000_identity_credentials_fix_user_handle_index.cockroach.up.sql

@@ -0,0 +1,6 @@
+DROP INDEX identity_credentials_user_handle_idx;
+
+CREATE INDEX identity_credentials_config_user_handle_idx
+    ON identity_credentials ((config ->> 'user_handle'))
+    WHERE config ->> 'user_handle' IS NOT NULL
+;