Constraints for users:
- users_user_type_check: CHECK (((user_type)::text = ANY (ARRAY[('admin'::character varying)::text, ('merchant'::character varying)::text, ('customer'::character varying)::text, ('sales_admin'::character varying)::text])))
- users_email_id_unique: UNIQUE (email_id)
- users_pkey: PRIMARY KEY (id)

Constraints for customers:
- customers_pkey: PRIMARY KEY (id)
- customers_user_table_id_foreign: FOREIGN KEY (user_table_id) REFERENCES users(id) ON DELETE CASCADE
- customers_referral_code_key: UNIQUE (referral_code)

Constraints for customer_interests:
- pk_customer_interests: PRIMARY KEY (id)
- customer_interests_category_id_foreign: FOREIGN KEY (category_id) REFERENCES categories(id) ON UPDATE CASCADE ON DELETE CASCADE
- customer_interests_user_id_foreign: FOREIGN KEY (user_id) REFERENCES users(id) ON UPDATE CASCADE ON DELETE CASCADE