update to support user expire, timeout, and disconnect

crates/chattyness-db/src/queries/channel_members.rs

@@ -273,3 +273,27 @@ pub async fn set_afk<'e>(
 
     Ok(())
 }
+
+/// Update the last_moved_at timestamp to keep the member alive.
+///
+/// Called when a ping is received from the client to prevent
+/// the member from being reaped by the stale member cleanup.
+pub async fn touch_member<'e>(
+    executor: impl PgExecutor<'e>,
+    channel_id: Uuid,
+    user_id: Uuid,
+) -> Result<(), AppError> {
+    sqlx::query(
+        r#"
+        UPDATE scene.instance_members
+        SET last_moved_at = now()
+        WHERE instance_id = $1 AND user_id = $2
+        "#,
+    )
+    .bind(channel_id)
+    .bind(user_id)
+    .execute(executor)
+    .await?;
+
+    Ok(())
+}