util/diesel: Remove obsolete Conn trait

Author: Turbo87

src/util/diesel.rs

@@ -1,11 +1,5 @@
-use diesel::connection::LoadConnection;
-use diesel::pg::Pg;
 use diesel::result::Error;
 
-pub trait Conn: LoadConnection<Backend = Pg> {}
-
-impl<T> Conn for T where T: LoadConnection<Backend = Pg> {}
-
 pub fn is_read_only_error(error: &Error) -> bool {
     matches!(error, Error::DatabaseError(_, info) if info.message().ends_with("read-only transaction"))
 }