pub const J3_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\
cb-buy,2025-02-01 12:00:00 UTC,Buy,BTC,0.50000000,USD,95000.00,47500.00,47550.00,50.00,,,\r\n\
cb-recv,2025-08-01 12:00:00 UTC,Receive,BTC,0.20000000,USD,110000.00,,,,,,\r\n";Expand description
J3 corpus: a Buy + a Receive (an inbound transfer with unknown basis → a hard blocker until classified).