diff --git a/src/app/api/diag/route.ts b/src/app/api/diag/route.ts
index ac86a4f..1fa34be 100644
--- a/src/app/api/diag/route.ts
+++ b/src/app/api/diag/route.ts
@@ -4,62 +4,81 @@ import { sql } from "drizzle-orm";
 
 const FF_API_BASE = process.env.FF_API_BASE_URL ?? "https://api.ffnancy.fr";
 
-export async function GET(req: NextRequest) {
-    const { searchParams } = new URL(req.url);
-    const target = searchParams.get("target") ?? "all";
-
-    const result: Record<string, unknown> = {
-        timestamp: new Date().toISOString(),
-        env: {
-            FF_API_BASE_URL: process.env.FF_API_BASE_URL ?? "(not set — using default)",
-            FF_API_BASE_resolved: FF_API_BASE,
-            NODE_ENV: process.env.NODE_ENV,
-        },
-    };
-
-    // ── Test FF Nancy API ────────────────────────────────────────────────────
-    if (target === "all" || target === "ff") {
-        const ffTests: Record<string, unknown> = {};
-
-        // Test fournisseurs
-        try {
-            const url = `${FF_API_BASE}/api/fournisseurs?limit=5`;
-            const res = await fetch(url, { cache: "no-store" });
-            const text = await res.text();
-            let parsed: unknown = null;
-            try { parsed = JSON.parse(text); } catch { parsed = text.slice(0, 500); }
-            ffTests.fournisseurs = { status: res.status, url, raw: parsed };
-        } catch (e) {
-            ffTests.fournisseurs = { error: String(e) };
-        }
-
-        // Test articles (avec un code fournisseur de test)
-        const codefou = searchParams.get("codefou");
-        if (codefou) {
-            try {
-                const url = `${FF_API_BASE}/api/articles?codefou=${codefou}&limit=3`;
-                const res = await fetch(url, { cache: "no-store" });
-                const text = await res.text();
-                let parsed: unknown = null;
-                try { parsed = JSON.parse(text); } catch { parsed = text.slice(0, 500); }
-                ffTests.articles = { status: res.status, url, raw: parsed };
-            } catch (e) {
-                ffTests.articles = { error: String(e) };
+async function probe(url: string) {
+    try {
+        const res = await fetch(url, { cache: "no-store" });
+        const text = await res.text();
+        let parsed: unknown = null;
+        try { parsed = JSON.parse(text); } catch { parsed = text.slice(0, 800); }
+        // Résumé: nb items si tableau, ou clés si objet
+        let summary: unknown = parsed;
+        if (Array.isArray(parsed)) {
+            summary = { count: parsed.length, firstKeys: parsed[0] ? Object.keys(parsed[0]) : [], sample: parsed.slice(0, 2) };
+        } else if (parsed && typeof parsed === "object") {
+            const keys = Object.keys(parsed as object);
+            const firstArrayKey = keys.find(k => Array.isArray((parsed as Record<string, unknown>)[k]));
+            if (firstArrayKey) {
+                const arr = (parsed as Record<string, unknown[]>)[firstArrayKey];
+                summary = { wrapper: firstArrayKey, count: arr.length, firstKeys: arr[0] ? Object.keys(arr[0] as object) : [], sample: arr.slice(0, 2) };
             }
         }
-
-        result.ffNancyApi = ffTests;
+        return { status: res.status, url, summary };
+    } catch (e) {
+        return { error: String(e), url };
     }
+}
 
-    // ── Test PostgreSQL ──────────────────────────────────────────────────────
-    if (target === "all" || target === "db") {
-        try {
-            const countResult = await db.execute(sql`SELECT COUNT(*) as count FROM session_snapshots`);
-            result.postgresql = { ok: true, snapshots: Number(countResult.rows[0]?.count ?? 0) };
-        } catch (e) {
-            result.postgresql = { ok: false, error: String(e) };
-        }
+export async function GET(req: NextRequest) {
+    const { searchParams } = new URL(req.url);
+    const codefou = searchParams.get("codefou") ?? "AUXENCE";
+
+    // Date range: 12 derniers mois
+    const now = new Date();
+    const dateFin = new Date(now.getFullYear(), now.getMonth(), 0).toISOString().slice(0, 10);
+    const dateDebut = new Date(now.getFullYear(), now.getMonth() - 12, 1).toISOString().slice(0, 10);
+
+    const [
+        fournisseurs,
+        articles,
+        // Tester plusieurs variantes de noms de paramètres pour les mouvements
+        mvt_datedeb,
+        mvt_dateDebut,
+        mvt_from,
+        mvt_nodate,
+    ] = await Promise.all([
+        probe(`${FF_API_BASE}/api/fournisseurs?limit=3`),
+        probe(`${FF_API_BASE}/api/articles?codefou=${codefou}&limit=3`),
+        probe(`${FF_API_BASE}/api/mouvements/articles?codefou=${codefou}&datedeb=${dateDebut}&datefin=${dateFin}&limit=3`),
+        probe(`${FF_API_BASE}/api/mouvements/articles?codefou=${codefou}&dateDebut=${dateDebut}&dateFin=${dateFin}&limit=3`),
+        probe(`${FF_API_BASE}/api/mouvements/articles?codefou=${codefou}&from=${dateDebut}&to=${dateFin}&limit=3`),
+        probe(`${FF_API_BASE}/api/mouvements/articles?codefou=${codefou}&limit=3`),
+    ]);
+
+    // Test PostgreSQL
+    let postgresql: unknown;
+    try {
+        const r = await db.execute(sql`SELECT COUNT(*) as count FROM session_snapshots`);
+        postgresql = { ok: true, snapshots: Number(r.rows[0]?.count ?? 0) };
+    } catch (e) {
+        postgresql = { ok: false, error: String(e) };
     }
 
-    return NextResponse.json(result, { status: 200 });
+    return NextResponse.json({
+        timestamp: new Date().toISOString(),
+        env: {
+            FF_API_BASE_URL: process.env.FF_API_BASE_URL ?? "(not set — default used)",
+            FF_API_BASE_resolved: FF_API_BASE,
+        },
+        dateRange: { dateDebut, dateFin },
+        codefouTested: codefou,
+        fournisseurs,
+        articles,
+        mouvements: {
+            "datedeb/datefin": mvt_datedeb,
+            "dateDebut/dateFin": mvt_dateDebut,
+            "from/to": mvt_from,
+            "no_date": mvt_nodate,
+        },
+        postgresql,
+    });
 }