pub const J5_CSV: &str = "\r\nTransactions\r\nUser,00000000-0000-0000-0000-000000000000\r\n\
ID,Timestamp,Transaction Type,Asset,Quantity Transacted,Price Currency,Price at Transaction,Subtotal,Total (inclusive of fees and/or spread),Fees and/or Spread,Notes,Sender Address,Recipient Address\r\n\
opt-buy-lt,2023-01-01 12:00:00 UTC,Buy,BTC,1.00000000,USD,30000.00,30000.00,30000.00,0.00,,,\r\n\
opt-buy-st,2025-01-02 12:00:00 UTC,Buy,BTC,1.00000000,USD,80000.00,80000.00,80000.00,0.00,,,\r\n\
opt-sell,2025-06-01 12:00:00 UTC,Sell,BTC,1.00000000,USD,50000.00,50000.00,50000.00,0.00,,,\r\n";Expand description
J5 corpus: an LT lot + a higher-basis ST lot + a 2025 sell — a genuine changed-selection scenario (HIFO ≠ FIFO) so the optimizer has a tax-saving pick to propose.