fix: pipeline typo and add features diagnostic script

- Fix NameError in insights.py pipeline endpoint (access -> access_calls)
- Add check_features.py diagnostic script for debugging

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

backend/check_features.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+"""Quick diagnostic script to check features table."""
+
+from db import get_db, get_cursor
+
+with get_db() as conn:
+    cur = get_cursor(conn)
+
+    print("\n=== FEATURES TABLE ===")
+    cur.execute("SELECT id, name, active, limit_type, reset_period FROM features ORDER BY id")
+    features = cur.fetchall()
+
+    if not features:
+        print("❌ NO FEATURES FOUND! Migration failed!")
+    else:
+        for r in features:
+            print(f"  {r['id']:30} {r['name']:40} active={r['active']} type={r['limit_type']:8} reset={r['reset_period']}")
+
+    print(f"\nTotal features: {len(features)}")
+
+    print("\n=== USER_FEATURE_USAGE (recent) ===")
+    cur.execute("""
+        SELECT profile_id, feature_id, usage_count, reset_at
+        FROM user_feature_usage
+        ORDER BY updated DESC
+        LIMIT 10
+    """)
+    usages = cur.fetchall()
+
+    if not usages:
+        print("  (no usage records yet)")
+    else:
+        for r in usages:
+            print(f"  {r['profile_id'][:8]}... -> {r['feature_id']:30} used={r['usage_count']} reset_at={r['reset_at']}")
+
+    print(f"\nTotal usage records: {len(usages)}")

backend/routers/insights.py

@@ -348,7 +348,7 @@ async def analyze_pipeline(x_profile_id: Optional[str]=Header(default=None), ses
     if not access_calls['allowed']:
         logger.warning(
             f"[FEATURE-LIMIT] User {pid} would be blocked: "
-            f"ai_calls {access_calls['reason']} (used: {access_calls['used']}, limit: {access['limit']})"
+            f"ai_calls {access_calls['reason']} (used: {access_calls['used']}, limit: {access_calls['limit']})"
         )
 
     # Old check (keep for now)