just add data loader here

data_loader/src/traits.rs

@@ -0,0 +1,23 @@
+use std::collections::HashMap;
+
+use sqlx::{Postgres, Transaction};
+
+
+
+pub trait SeptaJson {}
+
+pub trait FromSeptaJson<T: SeptaJson> {
+    fn from_septa_json(septa_json: T) -> ::anyhow::Result<Box<Self>>;  
+}
+
+pub trait FromSeptaJsonAndStations<T: SeptaJson> {
+    fn from_septa_json(septa_json: T, stop_map: &HashMap<String, i64>) -> ::anyhow::Result<Box<Self>>;  
+}
+
+pub trait DbObj<T> {
+    fn create_table(tx: &mut Transaction<'_, Postgres>) -> impl std::future::Future< Output = ::anyhow::Result<()>> + Send;
+    fn insert(&self, tx: &mut Transaction<'_, Postgres>) -> impl std::future::Future< Output =  ::anyhow::Result<()>> + Send; 
+    fn insert_many(s: Vec<T>, tx: &mut Transaction<'_, Postgres>) -> impl std::future::Future< Output =  ::anyhow::Result<()>> + Send; 
+}
+
+pub trait Fetchable<T: SeptaJson> {}