Wrap logic of the insert! macro in a transaction

plume-models/src/lib.rs

@@ -261,13 +261,16 @@ macro_rules! insert {
 
         #[allow(dead_code)]
         pub fn insert(conn: &crate::Connection, new: $from) -> Result<Self> {
-            diesel::insert_into($table::table)
-                .values(new)
-                .execute(conn)?;
-            #[allow(unused_mut)]
-            let mut $val = Self::last(conn)?;
-            let $conn = conn;
-            $( $after )+
+            use diesel::connection::Connection as _;
+            conn.transaction::<_, Error, _>(|| {
+                diesel::insert_into($table::table)
+                    .values(new)
+                    .execute(conn)?;
+                #[allow(unused_mut)]
+                let mut $val = Self::last(conn)?;
+                let $conn = conn;
+                $( $after )+
+            })
         }
     };
 }