/*
View: ar_live_balance

Columns:
    card_no int
    totcharges (calculated)
    totpayments (calculated)
    balance (calculated)
    mark (calculated)

Depends on:
    core_op.custdata (table)
    ar_history_sum (table)
    ar_history_today_sum (view)

Use:
This view lists real-time store charge
balances by membership. The column "mark"
indicates the balance changed today
*/