core: type streaming session timestamps

crates/crank-registry/src/model.rs

@@ -10,6 +10,7 @@ use crank_mapping::MappingSet;
 use crank_schema::Schema;
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
+use time::OffsetDateTime;
 
 macro_rules! define_registry_id {
     ($name:ident) => {
@@ -464,9 +465,9 @@ pub struct UpdateStreamSessionStateRequest<'a> {
     pub next_status: StreamStatus,
     pub cursor: Option<&'a Value>,
     pub state: &'a Value,
-    pub expires_at: Option<&'a str>,
-    pub last_poll_at: Option<&'a str>,
-    pub closed_at: Option<&'a str>,
+    pub expires_at: Option<&'a OffsetDateTime>,
+    pub last_poll_at: Option<&'a OffsetDateTime>,
+    pub closed_at: Option<&'a OffsetDateTime>,
 }
 
 #[derive(Clone, Debug, PartialEq, Eq)]
@@ -492,9 +493,9 @@ pub struct UpdateAsyncJobStatusRequest<'a> {
     pub progress: &'a Value,
     pub result: Option<&'a Value>,
     pub error: Option<&'a Value>,
-    pub expires_at: Option<&'a str>,
-    pub updated_at: &'a str,
-    pub finished_at: Option<&'a str>,
+    pub expires_at: Option<&'a OffsetDateTime>,
+    pub updated_at: &'a OffsetDateTime,
+    pub finished_at: Option<&'a OffsetDateTime>,
 }
 
 #[derive(Clone, Debug, PartialEq, Eq)]