fix(evaluations): correct fallback rounds + friendlier error messages

- Fallback names now use hyphens matching live API (carbanak-fin7, wizard-spider-sandworm)
- Add APT3 (R1) and Enterprise 2025/er7 (R7) to fallback - verified from live API
- Remove OilRig (R6) from fallback - CrowdStrike did not participate in Round 6
- Orange fallback banner only shows when NO rounds are available at all
- Soft gray note when rounds are loaded but API had transient error
- Check-new and import errors: detect 502/Cloudflare messages and show user-friendly text
  instead of raw Cloudflare HTML error messages

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/services/attck_evaluations_service.py

@@ -64,10 +64,20 @@ _HEADERS = {
 
 # ---------------------------------------------------------------------------
 # Fallback: hardcoded public CrowdStrike ENTERPRISE rounds
-# Used when evals.mitre.org API is unreachable (Cloudflare, outage, etc.)
-# These are well-known, publicly documented rounds — safe to hardcode.
+# Used when evals.mitre.org API is unreachable (Cloudflare 502, outage, etc.)
+#
+# Names use the EXACT slugs the live API returns (hyphens, not underscores).
+# Verified from live API response on 2025-06-05.
+# CrowdStrike did NOT participate in Round 6 (OilRig) — not included.
 # ---------------------------------------------------------------------------
 _FALLBACK_ROUNDS: list[dict[str, Any]] = [
+    {
+        "name": "apt3",
+        "display_name": "APT3",
+        "eval_round": 1,
+        "domain": "ENTERPRISE",
+        "status": "PUBLIC",
+    },
     {
         "name": "apt29",
         "display_name": "APT29",
@@ -76,14 +86,14 @@ _FALLBACK_ROUNDS: list[dict[str, Any]] = [
         "status": "PUBLIC",
     },
     {
-        "name": "carbanak_fin7",
+        "name": "carbanak-fin7",
         "display_name": "Carbanak+FIN7",
         "eval_round": 3,
         "domain": "ENTERPRISE",
         "status": "PUBLIC",
     },
     {
-        "name": "wizard_spider_sandworm",
+        "name": "wizard-spider-sandworm",
         "display_name": "Wizard Spider + Sandworm",
         "eval_round": 4,
         "domain": "ENTERPRISE",
@@ -97,9 +107,9 @@ _FALLBACK_ROUNDS: list[dict[str, Any]] = [
         "status": "PUBLIC",
     },
     {
-        "name": "oilrig",
-        "display_name": "OilRig",
-        "eval_round": 6,
+        "name": "er7",
+        "display_name": "Enterprise 2025",
+        "eval_round": 7,
         "domain": "ENTERPRISE",
         "status": "PUBLIC",
     },

frontend/src/pages/SystemPage.tsx

@@ -438,18 +438,24 @@ export default function SystemPage() {
           </div>
         </div>
 
-        {/* API fallback warning */}
-        {!evalApiReachable && evalApiError && (
+        {/* API fallback warning — only when no rounds loaded at all */}
+        {!evalApiReachable && evalApiError && (!evalRounds || evalRounds.length === 0) && (
           <div className="mb-4 flex items-start gap-3 rounded-lg border border-orange-500/30 bg-orange-900/10 p-3">
             <AlertCircle className="h-4 w-4 text-orange-400 flex-shrink-0 mt-0.5" />
             <div className="text-xs text-orange-300">
-              <span className="font-medium">Live API unavailable</span>
-              {" — "}showing known public rounds (hardcoded). Importing will attempt to fetch
-              live results and may also fail if the API remains unreachable.
+              <span className="font-medium">MITRE Evaluations API temporarily unavailable</span>
+              {" — "}could not load round list. The server may be overloaded. Try again later.
               <span className="block mt-1 text-orange-400/70 font-mono truncate">{evalApiError}</span>
             </div>
           </div>
         )}
+        {/* Soft note when using fallback data but rounds are still visible */}
+        {!evalApiReachable && evalRounds && evalRounds.length > 0 && (
+          <div className="mb-4 flex items-center gap-2 rounded-lg border border-gray-700 bg-gray-800/40 px-3 py-2 text-xs text-gray-400">
+            <AlertCircle className="h-3.5 w-3.5 text-gray-500 flex-shrink-0" />
+            Showing cached round list — live API had a transient error. Import may still work; retry if it fails.
+          </div>
+        )}
 
         {/* New round check result */}
         {evalCheckResult && (
@@ -461,9 +467,15 @@ export default function SystemPage() {
               : "border-gray-700 bg-gray-800/50"
           }`}>
             {evalCheckResult.error ? (
-              <div className="flex items-center gap-2 text-sm text-red-400">
-                <XCircle className="h-4 w-4 flex-shrink-0" />
-                <span>Check failed: {evalCheckResult.error}</span>
+              <div className="flex items-start gap-2 text-sm">
+                <XCircle className="h-4 w-4 flex-shrink-0 text-red-400 mt-0.5" />
+                <div>
+                  <span className="text-red-400">
+                    {evalCheckResult.error.includes("502") || evalCheckResult.error.includes("Cloudflare") || evalCheckResult.error.includes("origin")
+                      ? "MITRE Evaluations API temporarily unavailable (server overload). Try again in a few minutes."
+                      : `Check failed: ${evalCheckResult.error}`}
+                  </span>
+                </div>
               </div>
             ) : evalCheckResult.new_round_available ? (
               <div className="flex items-center gap-2 text-sm">
@@ -514,12 +526,25 @@ export default function SystemPage() {
         {/* Import error */}
         {(importLatestMutation.isError || importRoundMutation.isError) && (
           <div className="mb-4 rounded-lg border border-red-500/30 bg-red-900/20 p-3">
-            <div className="flex items-center gap-2 text-sm text-red-400">
-              <XCircle className="h-4 w-4 flex-shrink-0" />
-              <span>
-                {((importLatestMutation.error || importRoundMutation.error) as Error)?.message ??
-                  "Import failed. This round may already be imported."}
+            <div className="flex items-start gap-2 text-sm">
+              <XCircle className="h-4 w-4 flex-shrink-0 text-red-400 mt-0.5" />
+              <div>
+                {(() => {
+                  const msg = ((importLatestMutation.error || importRoundMutation.error) as Error)?.message ?? "";
+                  if (msg.includes("502") || msg.includes("Cloudflare") || msg.includes("origin") || msg.includes("Connection")) {
+                    return (
+                      <span className="text-red-400">
+                        MITRE Evaluations API is temporarily unavailable (server overload or maintenance).
+                        The import fetches live results from evals.mitre.org — please try again in a few minutes.
                       </span>
+                    );
+                  }
+                  if (msg.includes("already imported") || msg.includes("409")) {
+                    return <span className="text-yellow-400">This round has already been imported.</span>;
+                  }
+                  return <span className="text-red-400">{msg || "Import failed. This round may already be imported."}</span>;
+                })()}
+              </div>
             </div>
           </div>
         )}