-- Tenant data is not in use yet, so replace the earlier opaque tenant_key
-- column name with the relational tenant_id convention everywhere.
do $$
declare
  tbl text;
  con text;
begin
  foreach tbl in array array[
    'projects', 'thoughts', 'stored_files', 'learnings', 'plans', 'chat_histories',
    'agent_skills', 'agent_guardrails', 'agent_personas', 'agent_parts',
    'agent_traits', 'character_arcs'
  ] loop
    -- Fresh installs already have tenant_id from the regenerated schema;
    -- discard that empty column so the historical migration chain converges.
    if exists (
      select 1 from information_schema.columns
      where table_schema = 'public' and table_name = tbl and column_name = 'tenant_id'
    ) and exists (
      select 1 from information_schema.columns
      where table_schema = 'public' and table_name = tbl and column_name = 'tenant_key'
    ) then
      execute format('alter table %I drop column tenant_id', tbl);
    end if;
    if exists (
      select 1 from information_schema.columns
      where table_schema = 'public' and table_name = tbl and column_name = 'tenant_key'
    ) then
      execute format('alter table %I rename column tenant_key to tenant_id', tbl);
    end if;

    for con in
      select c.conname
      from pg_constraint c
      join pg_class r on r.oid = c.conrelid
      join pg_namespace n on n.oid = r.relnamespace
      join unnest(c.conkey) as k(attnum) on true
      join pg_attribute a on a.attrelid = r.oid and a.attnum = k.attnum
      where n.nspname = 'public' and r.relname = tbl and c.contype = 'f' and a.attname = 'tenant_id'
    loop
      execute format('alter table %I drop constraint %I', tbl, con);
    end loop;
    execute format('alter table %I add constraint %I foreign key (tenant_id) references tenants(id)', tbl, 'fk_' || tbl || '_tenant_id');
  end loop;
end $$;