diff --git a/iam-persistence/src/main/resources/db/migration/h2/V96__add_foreign_keys.sql b/iam-persistence/src/main/resources/db/migration/h2/V96__add_foreign_keys.sql
index 81aa1006e..d05a177a4 100644
--- a/iam-persistence/src/main/resources/db/migration/h2/V96__add_foreign_keys.sql
+++ b/iam-persistence/src/main/resources/db/migration/h2/V96__add_foreign_keys.sql
@@ -3,50 +3,50 @@
 DELETE from token_scope where owner_id not in (select id from access_token);
 ALTER TABLE token_scope ALTER COLUMN owner_id SET NOT NULL;
 ALTER TABLE token_scope ALTER COLUMN scope SET NOT NULL;
-ALTER TABLE token_scope ADD FOREIGN KEY (owner_id) REFERENCES access_token (id) ON DELETE CASCADE;
+ALTER TABLE token_scope ADD CONSTRAINT FK_token_scope_owner_id FOREIGN KEY (owner_id) REFERENCES access_token (id) ON DELETE CASCADE;
 
 -- CLIENT_DETAILS related TABLES
 
 DELETE FROM client_request_uri WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_request_uri ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_request_uri ADD CONSTRAINT FK_client_request_uri_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 DELETE FROM client_post_logout_redirect_uri WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_post_logout_redirect_uri ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_post_logout_redirect_uri ADD CONSTRAINT FK_client_post_logout_redirect_uri_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 DELETE FROM client_default_acr_value WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_default_acr_value ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_default_acr_value ADD CONSTRAINT FK_client_default_acr_value_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 DELETE FROM client_contact WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_contact ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_contact ADD CONSTRAINT FK_client_contact_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 DELETE FROM client_redirect_uri WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_redirect_uri ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_redirect_uri ADD CONSTRAINT FK_client_redirect_uri_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 DELETE FROM client_claims_redirect_uri WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_claims_redirect_uri ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_claims_redirect_uri ADD CONSTRAINT FK_client_claims_redirect_uri_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 DELETE FROM client_scope WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_scope ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_scope ADD CONSTRAINT FK_client_scope_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 -- AUTHENTICATION HOLDER and related
 
 DELETE FROM authentication_holder_scope WHERE owner_id NOT IN (SELECT id FROM authentication_holder);
-ALTER TABLE authentication_holder_scope ADD FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder_scope ADD CONSTRAINT FK_authentication_holder_scope_owner_id FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
 
 DELETE FROM authentication_holder_response_type WHERE owner_id NOT IN (SELECT id FROM authentication_holder);
-ALTER TABLE authentication_holder_response_type ADD FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder_response_type ADD CONSTRAINT FK_authentication_holder_response_type_owner_id FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
 
 DELETE FROM authentication_holder_resource_id WHERE owner_id NOT IN (SELECT id FROM authentication_holder);
-ALTER TABLE authentication_holder_resource_id ADD FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder_resource_id ADD CONSTRAINT FK_authentication_holder_resource_id_owner_id FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
 
 DELETE FROM authentication_holder_request_parameter WHERE owner_id NOT IN (SELECT id FROM authentication_holder);
-ALTER TABLE authentication_holder_request_parameter ADD FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder_request_parameter ADD CONSTRAINT FK_authentication_holder_request_parameter_owner_id FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
 
 DELETE FROM authentication_holder_extension WHERE owner_id NOT IN (SELECT id FROM authentication_holder);
-ALTER TABLE authentication_holder_extension ADD FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder_extension ADD CONSTRAINT FK_authentication_holder_extension_owner_id FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
 
 DELETE FROM authentication_holder_authority WHERE owner_id NOT IN (SELECT id FROM authentication_holder);
-ALTER TABLE authentication_holder_authority ADD FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder_authority ADD CONSTRAINT FK_authentication_holder_authority_owner_id FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
 
 DELETE FROM authentication_holder
 WHERE id NOT IN (SELECT auth_holder_id FROM access_token)
@@ -54,9 +54,9 @@ AND id NOT IN (SELECT auth_holder_id FROM refresh_token)
 AND id NOT IN (SELECT auth_holder_id FROM authorization_code);
 
 DELETE FROM authentication_holder WHERE user_auth_id NOT IN (SELECT id FROM saved_user_auth);
-ALTER TABLE authentication_holder ADD FOREIGN KEY (user_auth_id) REFERENCES saved_user_auth (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder ADD CONSTRAINT FK_authentication_holder_user_auth_id FOREIGN KEY (user_auth_id) REFERENCES saved_user_auth (id) ON DELETE CASCADE;
 DELETE FROM authentication_holder WHERE client_id NOT IN (SELECT client_id FROM client_details);
-ALTER TABLE authentication_holder ADD FOREIGN KEY (client_id) REFERENCES client_details (client_id) ON UPDATE CASCADE ON DELETE CASCADE;
+ALTER TABLE authentication_holder ADD CONSTRAINT FK_authentication_holder_client_id FOREIGN KEY (client_id) REFERENCES client_details (client_id) ON UPDATE CASCADE ON DELETE CASCADE;
 
 -- ACCESS TOKEN TABLE and related
 
@@ -64,26 +64,26 @@ DELETE FROM access_token_permissions WHERE access_token_id NOT IN (SELECT id FRO
 DELETE FROM access_token_permissions WHERE permission_id NOT IN (SELECT id FROM permission);
 
 ALTER TABLE access_token_permissions ADD PRIMARY KEY (access_token_id, permission_id);
-ALTER TABLE access_token_permissions ADD FOREIGN KEY (access_token_id) REFERENCES access_token (id) ON DELETE CASCADE;
-ALTER TABLE access_token_permissions ADD FOREIGN KEY (permission_id) REFERENCES permission (id) ON DELETE CASCADE;
+ALTER TABLE access_token_permissions ADD CONSTRAINT FK_access_token_permissions_access_token_id FOREIGN KEY (access_token_id) REFERENCES access_token (id) ON DELETE CASCADE;
+ALTER TABLE access_token_permissions ADD CONSTRAINT FK_access_token_permissions_permission_id FOREIGN KEY (permission_id) REFERENCES permission (id) ON DELETE CASCADE;
 
 DELETE FROM access_token WHERE refresh_token_id NOT IN (SELECT id FROM refresh_token);
 DELETE FROM access_token WHERE client_id NOT IN (SELECT id FROM client_details);
 DELETE FROM access_token WHERE auth_holder_id NOT IN (SELECT id FROM authentication_holder);
 
-ALTER TABLE access_token ADD FOREIGN KEY (refresh_token_id) REFERENCES refresh_token (id) ON DELETE SET NULL;
-ALTER TABLE access_token ADD FOREIGN KEY (client_id) REFERENCES client_details (id) ON DELETE SET NULL;
-ALTER TABLE access_token ADD FOREIGN KEY (auth_holder_id) REFERENCES authentication_holder (id) ON DELETE SET NULL;
+ALTER TABLE access_token ADD CONSTRAINT FK_access_token_refresh_token_id FOREIGN KEY (refresh_token_id) REFERENCES refresh_token (id) ON DELETE SET NULL;
+ALTER TABLE access_token ADD CONSTRAINT FK_access_token_client_id FOREIGN KEY (client_id) REFERENCES client_details (id) ON DELETE SET NULL;
+ALTER TABLE access_token ADD CONSTRAINT FK_access_token_auth_holder_id FOREIGN KEY (auth_holder_id) REFERENCES authentication_holder (id) ON DELETE SET NULL;
 
 -- REFRESH TOKEN
 
 DELETE FROM refresh_token WHERE client_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE refresh_token ADD FOREIGN KEY (client_id) REFERENCES client_details (id) ON DELETE SET NULL;
+ALTER TABLE refresh_token ADD CONSTRAINT FK_refresh_token_client_id FOREIGN KEY (client_id) REFERENCES client_details (id) ON DELETE SET NULL;
 
 -- APPROVED SITE
 
 DELETE FROM approved_site WHERE client_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE approved_site ADD FOREIGN KEY (client_id) REFERENCES client_details (client_id) ON UPDATE CASCADE ON DELETE SET NULL;
+ALTER TABLE approved_site ADD CONSTRAINT FK_approved_site_client_id FOREIGN KEY (client_id) REFERENCES client_details (client_id) ON UPDATE CASCADE ON DELETE SET NULL;
 
 DELETE FROM approved_site_scope WHERE owner_id NOT IN (SELECT id FROM approved_site);
-ALTER TABLE approved_site_scope ADD FOREIGN KEY (owner_id) REFERENCES approved_site (id) ON DELETE CASCADE;
+ALTER TABLE approved_site_scope ADD CONSTRAINT FK_approved_site_scope_owner_id FOREIGN KEY (owner_id) REFERENCES approved_site (id) ON DELETE CASCADE;
diff --git a/iam-persistence/src/main/resources/db/migration/mysql/V96__add_foreign_keys.sql b/iam-persistence/src/main/resources/db/migration/mysql/V96__add_foreign_keys.sql
index 9cc387506..386d20565 100644
--- a/iam-persistence/src/main/resources/db/migration/mysql/V96__add_foreign_keys.sql
+++ b/iam-persistence/src/main/resources/db/migration/mysql/V96__add_foreign_keys.sql
@@ -3,50 +3,50 @@
 DELETE from token_scope where owner_id not in (select id from access_token);
 ALTER TABLE token_scope MODIFY COLUMN owner_id bigint(20) NOT NULL;
 ALTER TABLE token_scope MODIFY COLUMN scope varchar(2048) NOT NULL;
-ALTER TABLE token_scope ADD FOREIGN KEY (owner_id) REFERENCES access_token (id) ON DELETE CASCADE;
+ALTER TABLE token_scope ADD CONSTRAINT FK_token_scope_owner_id FOREIGN KEY (owner_id) REFERENCES access_token (id) ON DELETE CASCADE;
 
 -- CLIENT_DETAILS related TABLES
 
 DELETE FROM client_request_uri WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_request_uri ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_request_uri ADD CONSTRAINT FK_client_request_uri_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 DELETE FROM client_post_logout_redirect_uri WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_post_logout_redirect_uri ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_post_logout_redirect_uri ADD CONSTRAINT FK_client_post_logout_redirect_uri_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 DELETE FROM client_default_acr_value WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_default_acr_value ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_default_acr_value ADD CONSTRAINT FK_client_default_acr_value_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 DELETE FROM client_contact WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_contact ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_contact ADD CONSTRAINT FK_client_contact_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 DELETE FROM client_redirect_uri WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_redirect_uri ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_redirect_uri ADD CONSTRAINT FK_client_redirect_uri_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 DELETE FROM client_claims_redirect_uri WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_claims_redirect_uri ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_claims_redirect_uri ADD CONSTRAINT FK_client_claims_redirect_uri_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 DELETE FROM client_scope WHERE owner_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE client_scope ADD FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
+ALTER TABLE client_scope ADD CONSTRAINT FK_client_scope_owner_id FOREIGN KEY (owner_id) REFERENCES client_details (id) ON DELETE CASCADE;
 
 -- AUTHENTICATION HOLDER and related
 
 DELETE FROM authentication_holder_scope WHERE owner_id NOT IN (SELECT id FROM authentication_holder);
-ALTER TABLE authentication_holder_scope ADD FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder_scope ADD CONSTRAINT FK_authentication_holder_scope_owner_id FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
 
 DELETE FROM authentication_holder_response_type WHERE owner_id NOT IN (SELECT id FROM authentication_holder);
-ALTER TABLE authentication_holder_response_type ADD FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder_response_type ADD CONSTRAINT FK_authentication_holder_response_type_owner_id FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
 
 DELETE FROM authentication_holder_resource_id WHERE owner_id NOT IN (SELECT id FROM authentication_holder);
-ALTER TABLE authentication_holder_resource_id ADD FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder_resource_id ADD CONSTRAINT FK_authentication_holder_resource_id_owner_id FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
 
 DELETE FROM authentication_holder_request_parameter WHERE owner_id NOT IN (SELECT id FROM authentication_holder);
-ALTER TABLE authentication_holder_request_parameter ADD FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder_request_parameter ADD CONSTRAINT FK_authentication_holder_request_parameter_owner_id FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
 
 DELETE FROM authentication_holder_extension WHERE owner_id NOT IN (SELECT id FROM authentication_holder);
-ALTER TABLE authentication_holder_extension ADD FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder_extension ADD CONSTRAINT FK_authentication_holder_extension_owner_id FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
 
 DELETE FROM authentication_holder_authority WHERE owner_id NOT IN (SELECT id FROM authentication_holder);
-ALTER TABLE authentication_holder_authority ADD FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder_authority ADD CONSTRAINT FK_authentication_holder_authority_owner_id FOREIGN KEY (owner_id) REFERENCES authentication_holder (id) ON DELETE CASCADE;
 
 DELETE FROM authentication_holder
 WHERE id NOT IN (SELECT auth_holder_id FROM access_token)
@@ -54,9 +54,9 @@ AND id NOT IN (SELECT auth_holder_id FROM refresh_token)
 AND id NOT IN (SELECT auth_holder_id FROM authorization_code);
 
 DELETE FROM authentication_holder WHERE user_auth_id NOT IN (SELECT id FROM saved_user_auth);
-ALTER TABLE authentication_holder ADD FOREIGN KEY (user_auth_id) REFERENCES saved_user_auth (id) ON DELETE CASCADE;
+ALTER TABLE authentication_holder ADD CONSTRAINT FK_authentication_holder_user_auth_id FOREIGN KEY (user_auth_id) REFERENCES saved_user_auth (id) ON DELETE CASCADE;
 DELETE FROM authentication_holder WHERE client_id NOT IN (SELECT client_id FROM client_details);
-ALTER TABLE authentication_holder ADD FOREIGN KEY (client_id) REFERENCES client_details (client_id) ON UPDATE CASCADE ON DELETE CASCADE;
+ALTER TABLE authentication_holder ADD CONSTRAINT FK_authentication_holder_client_id FOREIGN KEY (client_id) REFERENCES client_details (client_id) ON UPDATE CASCADE ON DELETE CASCADE;
 
 -- ACCESS TOKEN TABLE and related
 
@@ -64,26 +64,26 @@ DELETE FROM access_token_permissions WHERE access_token_id NOT IN (SELECT id FRO
 DELETE FROM access_token_permissions WHERE permission_id NOT IN (SELECT id FROM permission);
 
 ALTER TABLE access_token_permissions ADD PRIMARY KEY (access_token_id, permission_id);
-ALTER TABLE access_token_permissions ADD FOREIGN KEY (access_token_id) REFERENCES access_token (id) ON DELETE CASCADE;
-ALTER TABLE access_token_permissions ADD FOREIGN KEY (permission_id) REFERENCES permission (id) ON DELETE CASCADE;
+ALTER TABLE access_token_permissions ADD CONSTRAINT FK_access_token_permissions_access_token_id FOREIGN KEY (access_token_id) REFERENCES access_token (id) ON DELETE CASCADE;
+ALTER TABLE access_token_permissions ADD CONSTRAINT FK_access_token_permissions_permission_id FOREIGN KEY (permission_id) REFERENCES permission (id) ON DELETE CASCADE;
 
 DELETE FROM access_token WHERE refresh_token_id NOT IN (SELECT id FROM refresh_token);
 DELETE FROM access_token WHERE client_id NOT IN (SELECT id FROM client_details);
 DELETE FROM access_token WHERE auth_holder_id NOT IN (SELECT id FROM authentication_holder);
 
-ALTER TABLE access_token ADD FOREIGN KEY (refresh_token_id) REFERENCES refresh_token (id) ON DELETE SET NULL;
-ALTER TABLE access_token ADD FOREIGN KEY (client_id) REFERENCES client_details (id) ON DELETE SET NULL;
-ALTER TABLE access_token ADD FOREIGN KEY (auth_holder_id) REFERENCES authentication_holder (id) ON DELETE SET NULL;
+ALTER TABLE access_token ADD CONSTRAINT FK_access_token_refresh_token_id FOREIGN KEY (refresh_token_id) REFERENCES refresh_token (id) ON DELETE SET NULL;
+ALTER TABLE access_token ADD CONSTRAINT FK_access_token_client_id FOREIGN KEY (client_id) REFERENCES client_details (id) ON DELETE SET NULL;
+ALTER TABLE access_token ADD CONSTRAINT FK_access_token_auth_holder_id FOREIGN KEY (auth_holder_id) REFERENCES authentication_holder (id) ON DELETE SET NULL;
 
 -- REFRESH TOKEN
 
 DELETE FROM refresh_token WHERE client_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE refresh_token ADD FOREIGN KEY (client_id) REFERENCES client_details (id) ON DELETE SET NULL;
+ALTER TABLE refresh_token ADD CONSTRAINT FK_refresh_token_client_id FOREIGN KEY (client_id) REFERENCES client_details (id) ON DELETE SET NULL;
 
 -- APPROVED SITE
 
 DELETE FROM approved_site WHERE client_id NOT IN (SELECT id FROM client_details);
-ALTER TABLE approved_site ADD FOREIGN KEY (client_id) REFERENCES client_details (client_id) ON UPDATE CASCADE ON DELETE SET NULL;
+ALTER TABLE approved_site ADD CONSTRAINT FK_approved_site_client_id FOREIGN KEY (client_id) REFERENCES client_details (client_id) ON UPDATE CASCADE ON DELETE SET NULL;
 
 DELETE FROM approved_site_scope WHERE owner_id NOT IN (SELECT id FROM approved_site);
-ALTER TABLE approved_site_scope ADD FOREIGN KEY (owner_id) REFERENCES approved_site (id) ON DELETE CASCADE;
+ALTER TABLE approved_site_scope ADD CONSTRAINT FK_approved_site_scope_owner_id FOREIGN KEY (owner_id) REFERENCES approved_site (id) ON DELETE CASCADE;