diff --git a/acrate-core/migrations/2024-11-14-031744_meta/up.sql b/acrate-core/migrations/2024-11-14-031744_meta/up.sql
index c0f6c46..8387ac9 100644
--- a/acrate-core/migrations/2024-11-14-031744_meta/up.sql
+++ b/acrate-core/migrations/2024-11-14-031744_meta/up.sql
@@ -2,7 +2,7 @@ CREATE TABLE IF NOT EXISTS meta_subjects (
 	id UUID DEFAULT gen_random_uuid(),
 	document BPCHAR NOT NULL,
 	pattern BPCHAR NOT NULL,
-	redirect BPCHAR NOT NULL,
+	redirect BPCHAR,
 
 	PRIMARY KEY (id)
 );
diff --git a/acrate-core/src/meta.rs b/acrate-core/src/meta.rs
index aca144c..4fe0343 100644
--- a/acrate-core/src/meta.rs
+++ b/acrate-core/src/meta.rs
@@ -1,4 +1,4 @@
-use diesel::{Associations, Identifiable, Insertable, QueryResult, Queryable, QueryableByName, Selectable};
+use diesel::{Associations, Identifiable, Insertable, QueryResult, Queryable, QueryableByName, Selectable, pg::Pg};
 use diesel_async::AsyncPgConnection;
 use uuid::Uuid;
 use super::schema;
@@ -6,6 +6,7 @@ use super::schema;
 
 #[derive(Debug, Queryable, QueryableByName, Identifiable, Selectable, Insertable)]
 #[diesel(table_name = schema::meta_subjects)]
+#[diesel(check_for_backend(Pg))]
 pub struct MetaSubject {
 	pub id: Uuid,
 	pub document: String,
@@ -15,6 +16,7 @@ pub struct MetaSubject {
 
 #[derive(Debug, Queryable, QueryableByName, Identifiable, Selectable, Insertable)]
 #[diesel(table_name = schema::meta_aliases)]
+#[diesel(check_for_backend(Pg))]
 pub struct MetaAlias {
 	pub id: Uuid,
 	pub document: String,
@@ -24,6 +26,7 @@ pub struct MetaAlias {
 
 #[derive(Debug, Queryable, QueryableByName, Identifiable, Selectable, Insertable)]
 #[diesel(table_name = schema::meta_links)]
+#[diesel(check_for_backend(Pg))]
 pub struct MetaLink {
 	pub id: Uuid,
 	pub document: String,
@@ -37,6 +40,7 @@ pub struct MetaLink {
 #[derive(Debug, Queryable, QueryableByName, Identifiable, Selectable, Insertable, Associations)]
 #[diesel(belongs_to(MetaLink))]
 #[diesel(table_name = schema::meta_link_properties)]
+#[diesel(check_for_backend(Pg))]
 pub struct MetaLinkProperty {
 	pub id: Uuid,
 	pub meta_link_id: Uuid,
@@ -47,6 +51,7 @@ pub struct MetaLinkProperty {
 #[derive(Debug, Queryable, QueryableByName, Identifiable, Selectable, Insertable, Associations)]
 #[diesel(belongs_to(MetaLink))]
 #[diesel(table_name = schema::meta_link_titles)]
+#[diesel(check_for_backend(Pg))]
 pub struct MetaLinkTitle {
 	pub id: Uuid,
 	pub meta_link_id: Uuid,
@@ -56,6 +61,7 @@ pub struct MetaLinkTitle {
 
 #[derive(Debug, Queryable, QueryableByName, Identifiable, Selectable, Insertable)]
 #[diesel(table_name = schema::meta_properties)]
+#[diesel(check_for_backend(Pg))]
 pub struct MetaProperty {
 	pub id: Uuid,
 	pub document: String,
@@ -65,7 +71,7 @@ pub struct MetaProperty {
 }
 
 impl MetaSubject {
-	pub async fn query_matching(conn: &mut AsyncPgConnection, doc: &str, subject: &str) -> QueryResult<Vec<MetaSubject>> {
+	pub async fn query_matching(conn: &mut AsyncPgConnection, doc: &str, subject: &str) -> QueryResult<Vec<Self>> {
 		use diesel::prelude::*;
 		use diesel_async::RunQueryDsl;
 		use schema::meta_subjects::dsl::*;
@@ -83,7 +89,7 @@ impl MetaSubject {
 }
 
 impl MetaAlias {
-	pub async fn query_matching(conn: &mut AsyncPgConnection, doc: &str, subject: &str) -> QueryResult<Vec<MetaAlias>> {
+	pub async fn query_matching(conn: &mut AsyncPgConnection, doc: &str, subject: &str) -> QueryResult<Vec<Self>> {
 		use diesel::prelude::*;
 		use diesel_async::RunQueryDsl;
 		use schema::meta_aliases::dsl::*;
@@ -101,7 +107,7 @@ impl MetaAlias {
 }
 
 impl MetaLink {
-	pub async fn query_matching(conn: &mut AsyncPgConnection, doc: &str, subject: &str) -> QueryResult<Vec<MetaLink>> {
+	pub async fn query_matching(conn: &mut AsyncPgConnection, doc: &str, subject: &str) -> QueryResult<Vec<Self>> {
 		use diesel::prelude::*;
 		use diesel_async::RunQueryDsl;
 		use schema::meta_links::dsl::*;
@@ -119,7 +125,7 @@ impl MetaLink {
 }
 
 impl MetaLinkProperty {
-	pub async fn query_by_link(conn: &mut AsyncPgConnection, links: &[MetaLink]) -> QueryResult<Vec<MetaLinkProperty>> {
+	pub async fn query_by_link(conn: &mut AsyncPgConnection, links: &[MetaLink]) -> QueryResult<Vec<Self>> {
 		use diesel::prelude::*;
 		use diesel_async::RunQueryDsl;
 		
@@ -130,7 +136,7 @@ impl MetaLinkProperty {
 }
 
 impl MetaLinkTitle {
-	pub async fn query_by_link(conn: &mut AsyncPgConnection, links: &[MetaLink]) -> QueryResult<Vec<MetaLinkTitle>> {
+	pub async fn query_by_link(conn: &mut AsyncPgConnection, links: &[MetaLink]) -> QueryResult<Vec<Self>> {
 		use diesel::prelude::*;
 		use diesel_async::RunQueryDsl;
 		
@@ -141,7 +147,7 @@ impl MetaLinkTitle {
 }
 
 impl MetaProperty {
-	pub async fn query_matching(conn: &mut AsyncPgConnection, doc: &str, subject: &str) -> QueryResult<Vec<MetaProperty>>	{
+	pub async fn query_matching(conn: &mut AsyncPgConnection, doc: &str, subject: &str) -> QueryResult<Vec<Self>>	{
 		use diesel::prelude::*;
 		use diesel_async::RunQueryDsl;
 		use schema::meta_properties::dsl::*;
diff --git a/acrate-core/src/schema.rs b/acrate-core/src/schema.rs
index 4e9855d..94b2aa7 100644
--- a/acrate-core/src/schema.rs
+++ b/acrate-core/src/schema.rs
@@ -55,7 +55,7 @@ diesel::table! {
         id -> Uuid,
         document -> Bpchar,
         pattern -> Bpchar,
-        redirect -> Bpchar,
+        redirect -> Nullable<Bpchar>,
     }
 }