core: type observability timestamps

crates/crank-registry/src/model.rs

@@ -130,7 +130,8 @@ pub struct UsageRollupRecord {
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct UsageTimelinePoint {
-    pub bucket_start: String,
+    #[serde(with = "time::serde::rfc3339")]
+    pub bucket_start: OffsetDateTime,
     pub calls_ok: u64,
     pub calls_error: u64,
 }

crates/crank-registry/src/postgres/mod.rs

@@ -2496,7 +2496,7 @@ mod tests {
             error_kind: None,
             request_preview: json!({"input":"value"}),
             response_preview: json!({"ok":true}),
-            created_at: created_at.to_owned(),
+            created_at: timestamp(created_at),
         }
     }
 

crates/crank-registry/src/postgres/observability.rs

@@ -47,7 +47,7 @@ impl PostgresRegistry {
         .bind(&request.log.error_kind)
         .bind(Json(request.log.request_preview.clone()))
         .bind(Json(request.log.response_preview.clone()))
-        .bind(&request.log.created_at)
+        .bind(request.log.created_at)
         .execute(&self.pool)
         .await?;
 
@@ -75,7 +75,7 @@ impl PostgresRegistry {
                 l.error_kind,
                 l.request_preview_json,
                 l.response_preview_json,
-                to_char(l.created_at at time zone 'UTC', 'YYYY-MM-DD\"T\"HH24:MI:SS.MS\"Z\"') as created_at,
+                l.created_at as created_at,
                 o.name as operation_name,
                 o.display_name as operation_display_name,
                 a.slug as agent_slug,
@@ -147,7 +147,7 @@ impl PostgresRegistry {
                 l.error_kind,
                 l.request_preview_json,
                 l.response_preview_json,
-                to_char(l.created_at at time zone 'UTC', 'YYYY-MM-DD\"T\"HH24:MI:SS.MS\"Z\"') as created_at,
+                l.created_at as created_at,
                 o.name as operation_name,
                 o.display_name as operation_display_name,
                 a.slug as agent_slug,
@@ -229,7 +229,7 @@ impl PostgresRegistry {
         let bucket = usage_bucket_sql(query.bucket);
         let sql = format!(
             "select
-                to_char(date_trunc('{bucket}', created_at at time zone 'UTC'), 'YYYY-MM-DD\"T\"HH24:MI:SS\"Z\"') as bucket_start,
+                (date_trunc('{bucket}', created_at at time zone 'UTC') at time zone 'UTC') as bucket_start,
                 count(*) filter (where status = 'ok')::bigint as calls_ok,
                 count(*) filter (where status = 'error')::bigint as calls_error
              from invocation_logs