Factor out ioc finder to db crate

dbpg/src/err.rs

@@ -1,20 +1,7 @@
 use err::thiserror;
 use err::ThisError;
 
-#[derive(Debug)]
-pub struct Msg(pub String);
-
 #[derive(Debug, ThisError)]
 pub enum Error {
     Postgres(#[from] tokio_postgres::Error),
-    Msg(Msg),
-}
-
-impl Error {
-    pub fn from_msg<T>(msg: T) -> Self
-    where
-        T: Into<String>,
-    {
-        Self::Msg(Msg(msg.into()))
-    }
 }