feat(hq): seedable per-FY document series (HQ-1 task 7)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/hq/src/series.ts

@@ -0,0 +1,27 @@
+import { formatDocNo } from '@sims/domain'
+import type { DB } from './db'
+
+export const TYPE_PREFIX: Record<string, string> = {
+  QUOTATION: 'QT', PROFORMA: 'PI', INVOICE: 'INV', RECEIPT: 'RCT', CREDIT_NOTE: 'CN',
+}
+
+export function nextDocNo(db: DB, docType: string, fy: string): string {
+  const prefix = `${TYPE_PREFIX[docType]}/${fy.slice(2)}`
+  db.prepare(
+    `INSERT INTO doc_series (doc_type, fy, prefix, next_seq) VALUES (?, ?, ?, 1)
+     ON CONFLICT (doc_type, fy) DO NOTHING`,
+  ).run(docType, fy, prefix)
+  const row = db.prepare(`SELECT prefix, next_seq FROM doc_series WHERE doc_type=? AND fy=?`)
+    .get(docType, fy) as { prefix: string; next_seq: number }
+  db.prepare(`UPDATE doc_series SET next_seq = next_seq + 1 WHERE doc_type=? AND fy=?`).run(docType, fy)
+  return formatDocNo(row.prefix, row.next_seq, 4)
+}
+
+/** Mid-FY cutover (spec §4): continue after the last APEX-issued number. */
+export function seedSeries(db: DB, docType: string, fy: string, lastUsedSeq: number): void {
+  const prefix = `${TYPE_PREFIX[docType]}/${fy.slice(2)}`
+  db.prepare(
+    `INSERT INTO doc_series (doc_type, fy, prefix, next_seq) VALUES (?, ?, ?, ?)
+     ON CONFLICT (doc_type, fy) DO UPDATE SET next_seq = excluded.next_seq`,
+  ).run(docType, fy, prefix, lastUsedSeq + 1)
+}

apps/hq/test/series.test.ts

@@ -0,0 +1,18 @@
+import { describe, it, expect } from 'vitest'
+import { openDb } from '../src/db'
+import { nextDocNo, seedSeries } from '../src/series'
+
+describe('hq doc series', () => {
+  it('starts at 0001 per type+fy and increments', () => {
+    const db = openDb(':memory:')
+    expect(nextDocNo(db, 'QUOTATION', '2026-27')).toBe('QT/26-27-0001')
+    expect(nextDocNo(db, 'QUOTATION', '2026-27')).toBe('QT/26-27-0002')
+    expect(nextDocNo(db, 'INVOICE', '2026-27')).toBe('INV/26-27-0001')
+    expect(nextDocNo(db, 'QUOTATION', '2027-28')).toBe('QT/27-28-0001')
+  })
+  it('seeds from the last APEX number at cutover', () => {
+    const db = openDb(':memory:')
+    seedSeries(db, 'INVOICE', '2026-27', 412)
+    expect(nextDocNo(db, 'INVOICE', '2026-27')).toBe('INV/26-27-0413')
+  })
+})