diff --git a/src/entity/gateway/postgres/postgres.rs b/src/entity/gateway/postgres/postgres.rs
index 1239f1d..45aee91 100644
--- a/src/entity/gateway/postgres/postgres.rs
+++ b/src/entity/gateway/postgres/postgres.rs
@@ -407,6 +407,15 @@ impl EntityGateway for PostgresGateway {
             .execute(&self.pool).await?;
         Ok(())
     }
+
+    async fn add_weapon_modifier(&mut self, item_id: &ItemEntityId, modifier: weapon::WeaponModifier) -> Result<(), GatewayError> {
+        sqlx::query("insert into weapon_modifier (weapon, modifier) values ($1, $2);")
+            .bind(item_id.0)
+            .bind(sqlx::types::Json(modifier))
+            .execute(&self.pool).await?;
+        Ok(())
+    }
+
 /*
     async fn get_items_by_character(&self, char_id: &CharacterEntityId) -> Result<Vec<ItemEntity>, GatewayError> {
         let q = r#"select * from (