registry: type metadata and yaml import timestamps

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

@@ -920,7 +920,7 @@ fn build_sample_metadata(
     storage_ref: String,
     content_type: String,
     file_name: Option<String>,
-    created_at: String,
+    created_at: OffsetDateTime,
 ) -> Result<OperationSampleMetadata, RegistryError> {
     Ok(OperationSampleMetadata {
         id: crank_core::SampleId::new(id),
@@ -943,7 +943,7 @@ fn build_descriptor_metadata(
     storage_ref: String,
     source_name: Option<String>,
     package_index: Option<Value>,
-    created_at: String,
+    created_at: OffsetDateTime,
 ) -> Result<DescriptorMetadata, RegistryError> {
     Ok(DescriptorMetadata {
         id: crank_core::DescriptorId::new(id),
@@ -1335,7 +1335,7 @@ mod tests {
             storage_ref: "file:///tmp/input.json".to_owned(),
             content_type: "application/json".to_owned(),
             file_name: Some("input.json".to_owned()),
-            created_at: "2026-03-25T12:01:00Z".to_owned(),
+            created_at: timestamp("2026-03-25T12:01:00Z"),
         };
         let descriptor = DescriptorMetadata {
             id: "descriptor_01".into(),
@@ -1345,7 +1345,7 @@ mod tests {
             storage_ref: "file:///tmp/schema.desc".to_owned(),
             source_name: Some("schema.desc".to_owned()),
             package_index: Some(json!({ "crm.v1": ["LeadService"] })),
-            created_at: "2026-03-25T12:02:00Z".to_owned(),
+            created_at: timestamp("2026-03-25T12:02:00Z"),
         };
 
         registry
@@ -1436,7 +1436,7 @@ mod tests {
                 source_sample_id: None,
                 format_version: "v1",
                 mode: ExportMode::Portable,
-                created_at: "2026-03-25T12:00:00Z",
+                created_at: &timestamp("2026-03-25T12:00:00Z"),
             })
             .await
             .unwrap();
@@ -1449,7 +1449,7 @@ mod tests {
                     result_operation_id: Some(operation.id.clone()),
                     result_version: Some(2),
                     error_text: None,
-                    finished_at: "2026-03-25T12:05:00Z".to_owned(),
+                    finished_at: timestamp("2026-03-25T12:05:00Z"),
                 },
             )
             .await

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

@@ -854,7 +854,7 @@ impl PostgresRegistry {
         .bind(&request.sample.storage_ref)
         .bind(&request.sample.content_type)
         .bind(request.sample.file_name.as_deref())
-        .bind(&request.sample.created_at)
+        .bind(request.sample.created_at)
         .execute(&self.pool)
         .await?;
 
@@ -875,7 +875,7 @@ impl PostgresRegistry {
                 storage_ref,
                 content_type,
                 file_name,
-                to_char(created_at at time zone 'UTC', 'YYYY-MM-DD\"T\"HH24:MI:SS\"Z\"') as \"created_at!\"
+                created_at as \"created_at!: time::OffsetDateTime\"
              from operation_samples
              where operation_id = $1 and version = $2
              order by created_at asc",
@@ -941,7 +941,7 @@ impl PostgresRegistry {
         .bind(&request.descriptor.storage_ref)
         .bind(request.descriptor.source_name.as_deref())
         .bind(serialize_option_json_value(&request.descriptor.package_index)?.map(Json))
-        .bind(&request.descriptor.created_at)
+        .bind(request.descriptor.created_at)
         .execute(&self.pool)
         .await?;
 
@@ -962,7 +962,7 @@ impl PostgresRegistry {
                 storage_ref,
                 source_name,
                 package_index_json,
-                to_char(created_at at time zone 'UTC', 'YYYY-MM-DD\"T\"HH24:MI:SS\"Z\"') as \"created_at!\"
+                created_at as \"created_at!: time::OffsetDateTime\"
              from descriptors
              where operation_id = $1 and version = $2
              order by created_at asc",

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

@@ -60,7 +60,7 @@ impl PostgresRegistry {
         )
         .bind(completion.result_version.map(to_db_version))
         .bind(completion.error_text.as_deref())
-        .bind(&completion.finished_at)
+        .bind(completion.finished_at)
         .execute(&self.pool)
         .await?;
 
@@ -87,8 +87,8 @@ impl PostgresRegistry {
                 result_operation_id,
                 result_version,
                 error_text,
-                to_char(created_at at time zone 'UTC', 'YYYY-MM-DD\"T\"HH24:MI:SS\"Z\"') as created_at,
-                to_char(finished_at at time zone 'UTC', 'YYYY-MM-DD\"T\"HH24:MI:SS\"Z\"') as finished_at
+                created_at,
+                finished_at
              from yaml_import_jobs
              where id = $1",
         )