id, csv_id, hash, date_modified, column_0, column_1, ..., column_63, column_64

255 * 65 * 3 = 49,725

column_0 (TEXT), column_1 (TEXT), ..., column_63 (TEXT), column_64 (TEXT)

id, csv_id, hash, date_modified, data LONGTEXT, column_0 VARCHAR(512), ..., column_19 VARCHAR(512)

id, csv_id, hash, date_modified, data LONGTEXT, column_0 TEXT, ..., column_19 TEXT