Sprankelprachtig aan/afmeldsysteem

Maarten van den Berg f9e22be538 Add Subgroup-reference to participant 7 anos atrás
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migrate f9e22be538 Add Subgroup-reference to participant 7 anos atrás
schema.rb f9e22be538 Add Subgroup-reference to participant 7 anos atrás
seeds.rb af3e51f85b Fix crash when not seeding in production 7 anos atrás