Maple Street Piano (fictional) — expected VolosTally results
Studio time zone America/New_York, currency USD.
Illustrative rules: student cancellation (CXL) not charged and earns a makeup credit
for students with credits on; no-show charged; teacher cancellation not charged;
Mei Chen's monthly fee charged. Titles "Dentist" and "Recital rehearsal (hall)" marked
as not lessons.

MARCH 2026 (opening balances from the roster: Tobi 3 package lessons)
  Rivera family   $270.00
    Ana Rivera ($30/lesson, credits on, 30 min): 03-03 $30, 03-10 $30, 03-17 CXL credit +1,
      03-24 $30, 03-27 MAKEUP uses the credit $0, 03-31 skipped (EXDATE)  -> $90.00, credits 0 -> 0
    Ben Rivera ($60/hour): 03-03, 03-10, 03-17, 03-24, 45 min each = $45.00 each -> $180.00
  Chen family     $140.00
    Mei Chen (monthly fee $140): 03-04, 03-11, 03-18 (NOSHOW), 03-25 listed -> $140.00
  Okafor family   $55.00
    Tobi Okafor ($55/lesson, package, 60 min): 03-05, 03-12, 03-19 from package, 03-26 $55
      -> $55.00, package 3 -> 0 (note: 0 package lessons left)
  All families    $465.00

APRIL 2026 (opening balances from March's balances-2026-03.json)
  Rivera family   $225.00
    Ana Rivera: 04-07 $30, 04-14 CXL credit +1, 04-21 $30, 04-28 $30 -> $90.00, credits 0 -> 1
    Ben Rivera: 04-07, 04-14, 04-21 $45 each; 04-28 moved to 05-05 -> $135.00
  Chen family     $140.00  (Mei: 04-01, 04-08, 04-15, 04-22, 04-29 listed)
  Okafor family   $275.00  (Tobi: 04-02, 04-09, 04-16, 04-23, 04-30 at $55; package 0)
  All families    $640.00
