text: from main import db
  from datetime import datetime
  import uuid
  
  class Contribution(db.Model):
      uuid = db.Column(db.UUID(as_uuid=True), default=uuid.uuid4, primary_key=True)
      member_code = db.Column(db.String(20))
      period = db.Column(db.String(7)) # YYYY-MM
      amount = db.Column(db.Float)
      is_approved = db.Column(db.Boolean) # disable edit contribution
      remarks = db.Column(db.String(50))