Revert "Merge remote-tracking branch 'origin/pr/592'"

This reverts commit 3504875922, reversing
changes made to 5c3a1aecbe.

apps/aether-gateway/src/handlers/public/support/user_me_usage.rs

@@ -4,7 +4,6 @@ use aether_ai_serving::UPSTREAM_IS_STREAM_KEY;
 use aether_billing::{
     normalize_input_tokens_for_billing, normalize_total_input_context_for_cache_hit_rate,
 };
-use aether_contracts::USAGE_SERVER_NOW_UNIX_MS_HEADER;
 use aether_data_contracts::repository::usage::{
     StoredRequestUsageAudit, StoredUsageBreakdownSummaryRow, StoredUsageDailySummary,
     UsageAuditKeywordSearchQuery, UsageAuditListQuery, UsageBreakdownGroupBy,
@@ -30,21 +29,6 @@ use super::{
 
 const USERS_ME_USAGE_DATA_UNAVAILABLE_DETAIL: &str = "用户用量数据暂不可用";
 
-fn users_me_usage_server_now_unix_ms() -> u64 {
-    u64::try_from(Utc::now().timestamp_millis()).unwrap_or_default()
-}
-
-fn attach_users_me_usage_server_now_header(mut response: Response<Body>) -> Response<Body> {
-    if let Ok(value) = http::HeaderValue::from_str(&users_me_usage_server_now_unix_ms().to_string())
-    {
-        response.headers_mut().insert(
-            http::HeaderName::from_static(USAGE_SERVER_NOW_UNIX_MS_HEADER),
-            value,
-        );
-    }
-    response
-}
-
 fn build_users_me_usage_reader_unavailable_response() -> Response<Body> {
     build_auth_error_response(
         http::StatusCode::SERVICE_UNAVAILABLE,
@@ -1110,7 +1094,7 @@ pub(super) async fn handle_users_me_usage_get(
             &summary_by_provider
         ));
     }
-    attach_users_me_usage_server_now_header(Json(payload).into_response())
+    Json(payload).into_response()
 }
 
 pub(super) async fn handle_users_me_usage_active_get(
@@ -1185,15 +1169,13 @@ pub(super) async fn handle_users_me_usage_active_get(
             .collect::<Vec<_>>()
     };
 
-    attach_users_me_usage_server_now_header(
-        Json(json!({
-            "requests": items
-                .iter()
-                .map(build_users_me_usage_active_payload)
-                .collect::<Vec<_>>(),
-        }))
-        .into_response(),
-    )
+    Json(json!({
+        "requests": items
+            .iter()
+            .map(build_users_me_usage_active_payload)
+            .collect::<Vec<_>>(),
+    }))
+    .into_response()
 }
 
 pub(super) async fn handle_users_me_usage_interval_timeline_get(
@@ -1382,20 +1364,12 @@ async fn build_usage_heatmap_summaries(
 mod tests {
     use std::collections::BTreeMap;
 
-    use aether_contracts::USAGE_SERVER_NOW_UNIX_MS_HEADER;
     use aether_data_contracts::repository::usage::StoredRequestUsageAudit;
-    use axum::{
-        body::Body,
-        response::{IntoResponse, Response},
-        Json,
-    };
-    use chrono::Utc;
     use serde_json::json;
 
     use super::{
-        attach_users_me_usage_server_now_header, build_users_me_usage_active_payload,
-        build_users_me_usage_record_payload, users_me_usage_client_is_stream,
-        users_me_usage_is_failed, users_me_usage_server_now_unix_ms,
+        build_users_me_usage_active_payload, build_users_me_usage_record_payload,
+        users_me_usage_client_is_stream, users_me_usage_is_failed,
         users_me_usage_upstream_is_stream,
     };
 
@@ -1441,39 +1415,6 @@ mod tests {
         .expect("usage should build")
     }
 
-    #[test]
-    fn users_me_usage_server_now_unix_ms_uses_epoch_millis() {
-        let before = u64::try_from(Utc::now().timestamp_millis()).unwrap_or_default();
-        let value = users_me_usage_server_now_unix_ms();
-        let after = u64::try_from(Utc::now().timestamp_millis()).unwrap_or_default();
-
-        assert!(value >= before);
-        assert!(value <= after);
-        assert!(value > 1_000_000_000_000);
-    }
-
-    fn assert_users_me_usage_server_now_header(response: &Response<Body>) {
-        let value = response
-            .headers()
-            .get(USAGE_SERVER_NOW_UNIX_MS_HEADER)
-            .expect("user usage response should include server now header")
-            .to_str()
-            .expect("server now header should be valid ASCII")
-            .parse::<u64>()
-            .expect("server now header should be epoch millis");
-
-        assert!(value > 1_000_000_000_000);
-    }
-
-    #[test]
-    fn users_me_usage_server_now_header_is_added_to_response() {
-        let response = attach_users_me_usage_server_now_header(
-            Json(json!({ "requests": [] })).into_response(),
-        );
-
-        assert_users_me_usage_server_now_header(&response);
-    }
-
     #[test]
     fn user_usage_record_payload_rehydrates_cache_creation_total_from_classified_fields() {
         let item = StoredRequestUsageAudit {