Accounting: auto-create record-only bills for no-bill vendor payments (import mode)

Buildium often records vendor payments as direct checks (Dr Expense/Cr Bank)
with no bill. For import-mode companies post_bill_gl no-ops, so a bill is a
record only. New fn accounting.autocreate_nobill_vendor_bills() creates a paid
record-only bill for each such buildium_gl payment (vendor resolved by payee,
idempotent by external_id); buildium-gl-sync calls it per import-mode company
after each pull. No GL impact, no double-count.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

supabase/migrations/20260616180000_autocreate_nobill_vendor_bills.sql

@@ -0,0 +1,67 @@
+-- Auto-create record-only bills for no-bill vendor payments in IMPORT-MODE companies.
+--
+-- Buildium often records a vendor payment as a direct check (Dr Expense / Cr Bank)
+-- with no Bill behind it. For import-mode companies (gl_auto_post=false) the GL is
+-- the Buildium pull, and post_bill_gl no-ops, so a bill is a RECORD ONLY — creating
+-- one for such a payment surfaces it on the Bills page WITHOUT touching the GL (the
+-- expense is already booked once via the check). This makes A/P / vendor history
+-- complete without any double-count.
+--
+-- A "no-bill vendor payment" = a buildium_gl journal entry that: looks like a check
+-- /payment (description), debits >=1 expense account, credits >=1 asset account (the
+-- bank), and has NO accounts-payable line. Idempotent: skips entries that already
+-- have an acmacc_autobill_nobill bill. Vendor is resolved from the payee (text after
+-- the last "·" in the description) by exact name match; unmatched => bill with no
+-- vendor (still correct on the GL, fixable later). Safe to call after every GL pull.
+
+create or replace function accounting.autocreate_nobill_vendor_bills(_company_id uuid)
+returns integer
+language plpgsql security definer set search_path to 'public','accounting'
+as $function$
+declare _n int := 0; je record; _bill uuid; _vendor uuid; _payee text;
+begin
+  -- Import-mode only: in gl_managed companies bills POST (post_bill_gl) and would
+  -- double-count; those use the direct-expense rule instead.
+  if accounting.gl_managed(_company_id) then return 0; end if;
+
+  for je in
+    select j.id, j.date, j.description,
+      (select sum(l.debit) from accounting.journal_entry_lines l
+         join accounting.accounts a on a.id=l.account_id
+        where l.journal_entry_id=j.id and a.type='expense') as total
+    from accounting.journal_entries j
+    where j.company_id = _company_id
+      and j.external_source = 'buildium_gl'
+      and (j.description ilike 'Check%' or j.description ilike '%payment%')
+      and exists (select 1 from accounting.journal_entry_lines l join accounting.accounts a on a.id=l.account_id
+                  where l.journal_entry_id=j.id and a.type='expense' and l.debit>0)
+      and exists (select 1 from accounting.journal_entry_lines l2 join accounting.accounts a2 on a2.id=l2.account_id
+                  where l2.journal_entry_id=j.id and a2.type='asset' and l2.credit>0)
+      and not exists (select 1 from accounting.journal_entry_lines l3 join accounting.accounts a3 on a3.id=l3.account_id
+                      where l3.journal_entry_id=j.id and a3.type='liability' and a3.name ilike '%payable%')
+      and not exists (select 1 from accounting.bills b
+                      where b.company_id=_company_id and b.external_source='acmacc_autobill_nobill' and b.external_id=j.id::text)
+  loop
+    _payee := nullif(trim(regexp_replace(je.description, '^.*·\s*', '')), '');
+    select id into _vendor from accounting.vendors
+      where company_id=_company_id and _payee is not null and lower(name)=lower(_payee) limit 1;
+
+    insert into accounting.bills
+      (company_id, vendor_id, number, issue_date, due_date, status, subtotal, tax, total, paid_amount,
+       auto_created, external_source, external_id, notes)
+    values
+      (_company_id, _vendor, 'AUTOBILL-'||left(replace(je.id::text,'-',''),8), je.date, je.date, 'paid',
+       coalesce(je.total,0), 0, coalesce(je.total,0), coalesce(je.total,0),
+       true, 'acmacc_autobill_nobill', je.id::text, je.description)
+    returning id into _bill;
+
+    insert into accounting.bill_items (bill_id, description, quantity, rate, amount, account_id)
+    select _bill, a.name, 1, l.debit, l.debit, l.account_id
+    from accounting.journal_entry_lines l join accounting.accounts a on a.id=l.account_id
+    where l.journal_entry_id=je.id and a.type='expense' and l.debit>0;
+
+    _n := _n + 1;
+  end loop;
+
+  return _n;
+end$function$;