CREATE TABLE table_30339 ("Team" TEXT, "Outgoing manager" TEXT, "Manner of departure" TEXT, "Date of vacancy" TEXT, "Incoming manager" TEXT, "Date of appointment" TEXT)

when was the next coach appointed after niger tornadoes fired their coach?
SELECT "Date of appointment" FROM table_30339 WHERE "Manner of departure" = 'fired' AND "Team" = 'Niger Tornadoes'
SELECT "Date of appointment" FROM "table_30339" WHERE "Manner of departure" = 'fired' AND "Team" = 'Niger Tornadoes'