diff --git a/go-backend/internal/models/bank_account.go b/go-backend/internal/models/bank_account.go
index 00b8202..2ad00c0 100644
--- a/go-backend/internal/models/bank_account.go
+++ b/go-backend/internal/models/bank_account.go
@@ -13,6 +13,7 @@ type BankAccount struct {
 	ID                uint `gorm:"primaryKey"`
 	CreatedAt         time.Time
 	UpdatedAt         time.Time
+	User              User      `gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE"`
 	UserID            uint      `gorm:"index" json:"user_id"`
 	MandateDateSigned time.Time `json:"mandate_date_signed"`
 	Bank              string    `json:"bank_name" binding:"safe_content"`
diff --git a/go-backend/internal/models/membership.go b/go-backend/internal/models/membership.go
index 78c72b9..9b56031 100644
--- a/go-backend/internal/models/membership.go
+++ b/go-backend/internal/models/membership.go
@@ -10,6 +10,7 @@ import (
 type Membership struct {
 	ID                 uint `gorm:"primaryKey" json:"id"`
 	UserID             uint `gorm:"index" json:"user_id"`
+	User               User `gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE"`
 	CreatedAt          time.Time
 	UpdatedAt          time.Time
 	StartDate          time.Time    `json:"start_date"`
diff --git a/go-backend/templates/email/mail_change_password.tmpl b/go-backend/templates/email/mail_change_password.tmpl
index eb15566..64f6aec 100644
--- a/go-backend/templates/email/mail_change_password.tmpl
+++ b/go-backend/templates/email/mail_change_password.tmpl
@@ -36,7 +36,7 @@
                   target="_blank"
                   ><img
                     alt="Dörpsmobil Hasloh"
-                    src="{{.BASEURL}}/images/CarsharingSH-Hasloh-LOGO.jpeg"
+                    src="{{.Logo}}"
                     style="
                       outline: none;
                       border: none;
diff --git a/go-backend/templates/email/mail_contact_form.tmpl b/go-backend/templates/email/mail_contact_form.tmpl
index a4955e6..4e7362f 100644
--- a/go-backend/templates/email/mail_contact_form.tmpl
+++ b/go-backend/templates/email/mail_contact_form.tmpl
@@ -40,7 +40,7 @@
                                     target="_blank"
                                     ><img
                                         alt="{{.WebsiteTitle}}"
-                                        src="{{.BASEURL}}{{.Logo}}"
+                                        src="{{.Logo}}"
                                         style="
                                             outline: none;
                                             border: none;
diff --git a/go-backend/templates/email/mail_grant_backend_access.tmpl b/go-backend/templates/email/mail_grant_backend_access.tmpl
index b87b602..6ff5f6d 100644
--- a/go-backend/templates/email/mail_grant_backend_access.tmpl
+++ b/go-backend/templates/email/mail_grant_backend_access.tmpl
@@ -36,7 +36,7 @@
                   target="_blank"
                   ><img
                     alt="Dörpsmobil Hasloh"
-                    src="{{.BASEURL}}/images/CarsharingSH-Hasloh-LOGO.jpeg"
+                    src="{{.Logo}}"
                     style="
                       outline: none;
                       border: none;
diff --git a/go-backend/templates/email/mail_registration.tmpl b/go-backend/templates/email/mail_registration.tmpl
index f1ed216..d294333 100644
--- a/go-backend/templates/email/mail_registration.tmpl
+++ b/go-backend/templates/email/mail_registration.tmpl
@@ -36,7 +36,7 @@
                   target="_blank"
                   ><img
                     alt="{{.WebsiteTitle}}"
-                    src="{{.BASEURL}}{{.Logo}}"
+                    src="{{.Logo}}"
                     style="
                       outline: none;
                       border: none;
diff --git a/go-backend/templates/email/mail_verification.tmpl b/go-backend/templates/email/mail_verification.tmpl
index 9e307ee..052c4cb 100644
--- a/go-backend/templates/email/mail_verification.tmpl
+++ b/go-backend/templates/email/mail_verification.tmpl
@@ -36,7 +36,7 @@
                   target="_blank"
                   ><img
                     alt="Dörpsmobil Hasloh"
-                    src="{{.BASEURL}}/images/CarsharingSH-Hasloh-LOGO.jpeg"
+                    src="{{.Logo}}"
                     style="
                       outline: none;
                       border: none;
diff --git a/go-backend/templates/email/mail_welcome.tmpl b/go-backend/templates/email/mail_welcome.tmpl
index 1007bde..33ac607 100644
--- a/go-backend/templates/email/mail_welcome.tmpl
+++ b/go-backend/templates/email/mail_welcome.tmpl
@@ -36,7 +36,7 @@
                   target="_blank"
                   ><img
                     alt="{{.WebsiteTitle}}"
-                    src="{{.BASEURL}}{{.Logo}}"
+                    src="{{.Logo}}"
                     style="
                       outline: none;
                       border: none;