From 8d9bc1c422c528bc94e742de28f522dc39782d83 Mon Sep 17 00:00:00 2001
From: Ben Vincent <ben@unkin.net>
Date: Sat, 27 Jun 2026 22:18:02 +1000
Subject: [PATCH] feat: add bandwidth saved stat to dashboard (#65)

Shows total bytes served from cache (instead of upstream) over the last 30 days. Queries `SUM(size_bytes) WHERE cache_hit = TRUE` from access_log.

Reviewed-on: https://git.unkin.net/unkin/artifactapi/pulls/65
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>
---
 internal/database/stats.go | 9 +++++++++
 ui/src/pages/Dashboard.tsx | 5 +++++
 2 files changed, 14 insertions(+)

diff --git a/internal/database/stats.go b/internal/database/stats.go
index d21cb68..75af387 100644
--- a/internal/database/stats.go
+++ b/internal/database/stats.go
@@ -30,6 +30,15 @@ func (db *DB) GetOverviewStats(ctx context.Context) (*models.OverviewStats, erro
 		return nil, err
 	}
 
+	err = db.Pool.QueryRow(ctx, `
+		SELECT COALESCE(SUM(size_bytes), 0)
+		FROM access_log
+		WHERE cache_hit = TRUE AND created_at > NOW() - INTERVAL '30 days'
+	`).Scan(&stats.BandwidthSaved30d)
+	if err != nil {
+		return nil, err
+	}
+
 	return &stats, nil
 }
 
diff --git a/ui/src/pages/Dashboard.tsx b/ui/src/pages/Dashboard.tsx
index 1565157..b0a5792 100644
--- a/ui/src/pages/Dashboard.tsx
+++ b/ui/src/pages/Dashboard.tsx
@@ -50,6 +50,11 @@ export function Dashboard() {
           value={formatNumber(stats.total_blobs_deduped)}
           sub="shared blobs"
         />
+        <StatsCard
+          label="Bandwidth Saved"
+          value={formatBytes(stats.bandwidth_saved_30d)}
+          sub="last 30 days"
+        />
       </div>
 
       {health && (