user: Question: what is the date when the surface is Clay and the result is 6–7 (4–7) , 1–6?
Columns: ['Edition', 'Round', 'Date', 'Against', 'Surface', 'Opponent', 'Result']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['2002 Fed Cup Europe/Africa Group I', 'RR', '24 April 2002', 'Bulgaria', 'Clay', 'Desislava Topalova', '6–7 (4–7) , 1–6']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Surface" = 'Clay' AND "Result" = '6–7 (4–7) , 1–6';