diff --git a/persmgr_derive/src/lib.rs b/persmgr_derive/src/lib.rs
index d46b726..985c51f 100644
--- a/persmgr_derive/src/lib.rs
+++ b/persmgr_derive/src/lib.rs
@@ -86,10 +86,7 @@ pub fn derive_table_meta(input: TokenStream) -> TokenStream {
         impl TableMeta for #ident {
             type PrimaryKey = #key_t;
             const TABLE: &'static str = #table_name;
-        }
-
-        impl #ident {
-            pub async fn update(&mut self, pool: &crate::db::CurrPool) -> anyhow::Result<Self> {
+            async fn update(&mut self, pool: &crate::db::CurrPool) -> anyhow::Result<Self> {
                 #modified_at
                 let session = sqlx::query_as!(
                     #ident,
diff --git a/src/db/tables/mod.rs b/src/db/tables/mod.rs
index b049f84..939ded9 100644
--- a/src/db/tables/mod.rs
+++ b/src/db/tables/mod.rs
@@ -16,6 +16,7 @@ pub mod user;
 pub trait TableMeta: for<'r> sqlx::FromRow<'r, PgRow> {
     type PrimaryKey: Type<super::CurrDb> + Clone;
     const TABLE: &'static str;
+    async fn update(&mut self, pool: &crate::db::CurrPool) -> anyhow::Result<Self>;
 }
 
 #[derive(Debug, Clone, Default)]