diff --git a/.jules/bolt.md b/.jules/bolt.md
new file mode 100644
index 00000000..40a34110
--- /dev/null
+++ b/.jules/bolt.md
@@ -0,0 +1,4 @@
+## 2025-02-20 - [Performance] Optimize independent backend sequential queries
+
+**Learning:** When retrieving data from Astro DB/Drizzle ORM using multiple `await db.select().from(Table)` queries in an API endpoint, doing so sequentially creates unnecessary sequential I/O bottleneck wait time.
+**Action:** Identify independent queries in data retrieval endpoints and group them using `await Promise.all([db.select()..., db.select()...])` to execute them concurrently, reducing total wait time to the longest single query without sacrificing code readability.
diff --git a/src/pages/api/agent-budget.ts b/src/pages/api/agent-budget.ts
index a135f158..3f66b5a8 100644
--- a/src/pages/api/agent-budget.ts
+++ b/src/pages/api/agent-budget.ts
@@ -17,9 +17,12 @@ export async function GET({ url }: { url: URL }) {
     const agentId = url.searchParams.get('agentId');
 
     // Récupérer tous les budgets (avec infos agents)
-    const budgets = await db.select().from(AgentBudget);
-    const allEvents = await db.select().from(CostEvent);
-    const instructions = await db.select().from(AgentInstruction);
+    // ⚡ Bolt: Concurrent query execution to avoid sequential I/O bottlenecks
+    const [budgets, allEvents, instructions] = await Promise.all([
+      db.select().from(AgentBudget),
+      db.select().from(CostEvent),
+      db.select().from(AgentInstruction),
+    ]);
 
     // Map agentId → model name
     const agentModels: Record<string, string> = {};