core: Add missing rel attribute to meta_properties

acrate-core/migrations/2024-11-14-031744_meta/up.sql

@@ -32,6 +32,7 @@ CREATE TABLE meta_properties (
 	id UUID DEFAULT gen_random_uuid(),
 	document BPCHAR NOT NULL,
 	pattern BPCHAR NOT NULL,
+	rel BPCHAR NOT NULL,
 	value BPCHAR,
 	
 	PRIMARY KEY (id)

acrate-core/src/meta.rs

@@ -40,6 +40,7 @@ pub struct MetaProperty {
 	pub id: Uuid,
 	pub document: String,
 	pub pattern: String,
+	pub rel: String,
 	pub value: Option<String>,
 }