[codex] Lazy proxy traffic refresh

[acking-you]

Summary

• Stop eagerly computing proxy traffic when opening /admin/llm-gateway.
• Add a persisted llm_proxy_config_traffic_snapshots Postgres table and return the last snapshot with proxy configs.
• Add a per-proxy POST /admin/llm-gateway/proxy-configs/:proxy_id/traffic-refresh endpoint that computes a retained-window snapshot and saves it.
• Update the admin UI to show the last cached traffic snapshot plus refresh time, with an explicit per-proxy refresh button.

Why

The settings page was doing an expensive all-proxy traffic calculation during normal page reloads/tab entry. That made /admin/llm-gateway slower and could amplify usage-worker load. The new behavior makes the expensive calculation opt-in per proxy while preserving the last calculated value for display.

Validation

• CARGO_TARGET_DIR=/mnt/wsl/data4tb/static-flow-data/cargo-target/static_flow cargo test -p static-flow-frontend proxy_traffic_snapshot_helpers_show_uncalculated_and_persisted_badge_state --jobs 4
• CARGO_TARGET_DIR=/mnt/wsl/data4tb/static-flow-data/cargo-target/static_flow cargo test -p static-flow-frontend proxy_traffic_window_label_matches_retained_analytics_window --jobs 4
• CARGO_TARGET_DIR=/mnt/wsl/data4tb/static-flow-data/cargo-target/static_flow cargo test -p llm-access-core -p llm-access-migrations -p llm-access-store -p llm-access traffic --jobs 4
• CARGO_TARGET_DIR=/mnt/wsl/data4tb/static-flow-data/cargo-target/static_flow cargo clippy -p llm-access-core -p llm-access-store -p llm-access-migrations -p llm-access -p static-flow-frontend --jobs 4 -- -D warnings
• git diff --check

Rollout Note

Run the new Postgres migration before relying on proxy config listing in production, because traffic_snapshot is loaded from the new snapshot table.

[gemini-code-assist]

Code Review

This pull request introduces the ability to manually refresh and persist traffic snapshots for LLM gateway proxy configurations, spanning frontend UI components, database migrations, and backend API endpoints. The review feedback highlights several performance improvements, such as returning early on empty lists, removing redundant database queries, and reusing a shared reqwest::Client to prevent socket exhaustion. Additionally, the feedback recommends translating several Chinese UI strings, feedback messages, and test assertions to English to maintain UI consistency.

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[gemini-code-assist]

To prevent redundant database round-trips, we should return early if the input proxies list is empty. This avoids executing the list_proxy_traffic_snapshots query when there are no proxies to update.

    async fn apply_proxy_traffic_snapshots_to_configs(
        &self,
        proxies: &mut [AdminProxyConfig],
    ) -> anyhow::Result<()> {
        if proxies.is_empty() {
            return Ok(());
        }
        let snapshots = self.list_proxy_traffic_snapshots().await?;
        for proxy in proxies {
            proxy.traffic_snapshot = snapshots.get(&proxy.id).cloned();
        }
        Ok(())
    }

References

1. For functions performing database queries or cache invalidations based on a list of IDs, return early if the input list is empty to prevent redundant database round-trips and cache operations.

[gemini-code-assist]

The existence check get_admin_proxy_config is redundant here because the subsequent function record_admin_proxy_traffic_snapshot already performs the same existence check internally and returns None if the proxy config is not found. Removing this pre-check avoids an unnecessary database query.

References

1. Avoid redundant database queries by ensuring that a subsequent function (such as a patch or update function) does not already perform the same existence check internally before calling it.

[gemini-code-assist]

Instantiating a new reqwest::Client on every request prevents connection pooling and can lead to socket exhaustion under high load. Consider reusing a shared reqwest::Client (e.g., by storing it in HttpState or using a thread-safe shared client) to improve performance and efficiency.

[gemini-code-assist]

The string "流量未计算" is in Chinese, which is inconsistent with the rest of the English UI strings in this file (such as "traffic refreshed" and "traffic not calculated"). We should translate it to English to maintain UI consistency.

        None => "traffic not calculated".to_string(),

[gemini-code-assist]

The feedback and flash messages are in Chinese, which is inconsistent with the rest of the English admin UI. We should translate them to English to maintain UI consistency.

                        feedback.set(Some("Traffic refreshed".to_string()));
                        on_flash.emit(("Refreshed proxy traffic".to_string(), false));
                    },
                    Err(err) => {
                        feedback.set(Some(err.clone()));
                        on_flash.emit((format!("Failed to refresh proxy traffic\n{err}"), true));

[gemini-code-assist]

The button text is in Chinese, which is inconsistent with the rest of the English admin UI. We should translate it to English to maintain UI consistency.

                    { if *refreshing_traffic { "Calculating..." } else { "Refresh Traffic" } }

[gemini-code-assist]

Update the test assertion to match the English translation of the badge state.

        assert_eq!(proxy_traffic_snapshot_badge(None), "traffic not calculated");
        assert_eq!(proxy_traffic_snapshot_meta(None), "traffic not calculated");