user: Question: When did Svishtov , Bulgaria disband?
Columns: ['Legion no. and title', 'Main legionary base', 'Emblem', 'Date founded/ founder', 'Date disband', 'Castra legionaria (legion bases) * = main base. Start date 31BC if unspecified', 'Notes']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['I Germanica', 'Bonn , Germany', 'Bull', '48 BC Caesar', '70 DD', 'to 16 BC HISP; c.5 BC-70 AD a Bonn * (GI)', 'Disbanded for cowardice in Batavi revolt']
SQL:

assistant: SELECT "Date disband" FROM "Table" WHERE "Main legionary base" = 'Svishtov , Bulgaria';