⚡ Bolt: [performance improvement] Parallelize admin stats queries

.jules/bolt.md

@@ -1,3 +1,6 @@
 ## 2024-03-24 - Database Roundtrip Optimization in Serverless Environments
 **Learning:** In Cloudflare D1 and similar serverless SQL databases, sequential `db.prepare(...).first()` calls create a severe N+1 latency bottleneck because each statement requires a discrete HTTP request over the network.
 **Action:** Always combine sequential, unrelated scalar queries into a single `db.batch()` request. For aggregate stats, use conditional aggregation (`SUM(CASE WHEN...)`) to gather multiple metrics in a single table scan inside that batch.
+## 2024-07-24 - Admin Stats Concurrent DB Queries
+**Learning:** Sequential, independent database queries inside Cloudflare D1 edge functions (like `db.prepare().first()`) can cause unnecessary N+1 network latency delays on dashboard routes.
+**Action:** When multiple independent stats or metrics need to be fetched, group them into a single `Promise.all([db.prepare().first().catch(...)])` block to execute concurrently, ensuring to maintain individual `.catch` handlers so one failure doesn't crash the entire batch.

src/app/api/admin/[[...slug]]/route.ts

@@ -201,56 +201,55 @@ export async function GET(request: Request, context: { params: Promise<{ slug?:
       let forwardCount = 0;
 
       if (db) {
-        try {
-          const fileStats: any = await db.prepare(`
+        // Bolt: Execute queries concurrently to eliminate N+1 network latency
+        await Promise.all([
+          db.prepare(`
             SELECT COUNT(*) as total_files, COALESCE(SUM(file_size), 0) as total_bytes
             FROM vault_files
-          `).first();
-          if (fileStats) {
-            fileCount = Number(fileStats.total_files || 0);
-            totalCapacity = Number(fileStats.total_bytes || 0);
-          }
-        } catch (e: any) {
-          logger.error("ADMIN_STATS: Failed to query vault_files.", e.message);
-        }
-
-        try {
-          const emailStats: any = await db.prepare(`
+          `).first()
+            .then((fileStats: any) => {
+              if (fileStats) {
+                fileCount = Number(fileStats.total_files || 0);
+                totalCapacity = Number(fileStats.total_bytes || 0);
+              }
+            })
+            .catch((e: any) => logger.error("ADMIN_STATS: Failed to query vault_files.", e.message)),
+
+          db.prepare(`
             SELECT COUNT(*) as total_aliases, COALESCE(SUM(forward_count), 0) as total_forwards
             FROM relay_aliases
-          `).first();
-          if (emailStats) {
-            aliasCount = Number(emailStats.total_aliases || 0);
-            forwardCount = Number(emailStats.total_forwards || 0);
-          }
-        } catch (e: any) {
-          logger.error("ADMIN_STATS: Failed to query relay_aliases.", e.message);
-        }
-
-        try {
-          const userStats: any = await db.prepare(`
+          `).first()
+            .then((emailStats: any) => {
+              if (emailStats) {
+                aliasCount = Number(emailStats.total_aliases || 0);
+                forwardCount = Number(emailStats.total_forwards || 0);
+              }
+            })
+            .catch((e: any) => logger.error("ADMIN_STATS: Failed to query relay_aliases.", e.message)),
+
+          db.prepare(`
             SELECT COUNT(DISTINCT user_id) as total_users 
             FROM vault_users
-          `).first();
-          if (userStats) {
-            userCount = Number(userStats.total_users || 0);
-          }
-        } catch (e: any) {
-          logger.error("ADMIN_STATS: Failed to query vault_users.", e.message);
-        }
-
-        try {
-          const secretStats: any = await db.prepare(`
+          `).first()
+            .then((userStats: any) => {
+              if (userStats) {
+                userCount = Number(userStats.total_users || 0);
+              }
+            })
+            .catch((e: any) => logger.error("ADMIN_STATS: Failed to query vault_users.", e.message)),
+
+          db.prepare(`
             SELECT COUNT(*) as active_secrets 
             FROM stealth_secrets 
             WHERE is_viewed = 0 AND expires_at > datetime('now')
-          `).first();
-          if (secretStats) {
-            secretCount = Number(secretStats.active_secrets || 0);
-          }
-        } catch (e: any) {
-          logger.error("ADMIN_STATS: Failed to query stealth_secrets.", e.message);
-        }
+          `).first()
+            .then((secretStats: any) => {
+              if (secretStats) {
+                secretCount = Number(secretStats.active_secrets || 0);
+              }
+            })
+            .catch((e: any) => logger.error("ADMIN_STATS: Failed to query stealth_secrets.", e.message))
+        ]);
       }
 
       return NextResponse.json({