2 votes
Accepted

Encrypt Customer data before save into the database and Decrypt Customer data after fetched from the database

Magento has a lot of logic to work with customer data directly with placeholders, etc. Unfortunately it's very difficult (and in some cases impossible properly) to encrypt all customer and address ...
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1 vote

Magento 2 - Customer Type Table SQL

This is too vague question to advise anything concrete. Customer model is based on EAV(Entity Attribute Value) and related customer data stored in tables like customer_entity_* EAV metadata for link ...
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