Takainvest does not use any user data from facebook, so data deletion is not required. Facebook SDK is required only for App advertisement purposes.
Takainvest collects anonymized usage statistics through firebase analytics to do A/B testing of features, also to keep track of app crashes to provide a good experience to the user. The data is kept temporarily for 3 months and deleted afterwards automatically.
Asset trading history cannot be deleted as it is required by Securities and Exchange Commission of Bangladesh to keep the data for future reference on fraud prevention.