refactor: rename to to better reflect meaning

server/crates/arbiter-server/migrations/2026-02-14-171124-0000_init/up.sql

@@ -43,13 +43,13 @@ create table if not exists arbiter_settings (
 insert into arbiter_settings (id) values (1) on conflict do nothing;
 -- ensure singleton row exists
 
-create table if not exists useragent_client (
+create table if not exists operator_client (
     id integer not null primary key,
     public_key blob not null,
     created_at integer not null default(unixepoch ('now')),
     updated_at integer not null default(unixepoch ('now'))
 ) STRICT;
-create unique index if not exists uniq_useragent_client_public_key on useragent_client (public_key);
+create unique index if not exists uniq_operator_client_public_key on operator_client (public_key);
 
 create table if not exists client_metadata (
     id integer not null primary key,