-- reverse: modify "s_personal_daten" table
ALTER TABLE "s_personal_daten" ALTER COLUMN "nachname" DROP NOT NULL, ALTER COLUMN "vorname" DROP NOT NULL;
-- reverse: modify "anwesenheit" table
ALTER TABLE "anwesenheit" ALTER COLUMN "anwesenheit_typ" DROP NOT NULL, ALTER COLUMN "geraet_id" DROP NOT NULL, ALTER COLUMN "timestamp" DROP NOT NULL;
