mike/backend/migrations/20260613_01_chats_overview_rpc.sql

-- Migration date: 2026-06-13

-- Global assistant chats overview read model.
-- Returns the user's own chats plus chats under projects they own.

create or replace function public.get_chats_overview(
  p_user_id text,
  p_limit integer default null
)
returns table (
  id uuid,
  project_id uuid,
  user_id text,
  title text,
  created_at timestamptz
)
language sql
stable
as $$
  select
    c.id,
    c.project_id,
    c.user_id,
    c.title,
    c.created_at
  from public.chats c
  where c.user_id = p_user_id
     or exists (
      select 1
      from public.projects p
      where p.id = c.project_id
        and p.user_id = p_user_id
    )
  order by c.created_at desc
  limit case
    when p_limit is null then null
    else greatest(1, least(p_limit, 100))
  end;
$$;