diff --git a/backend/app/routers/analytics.py b/backend/app/routers/analytics.py
index 87175e6..4997888 100644
--- a/backend/app/routers/analytics.py
+++ b/backend/app/routers/analytics.py
@@ -8,7 +8,7 @@ from fastapi import APIRouter, Depends, Query
 from sqlalchemy.orm import Session
 
 from app.database import get_db
-from app.dependencies.auth import get_current_user, require_any_role
+from app.dependencies.auth import get_current_user, require_role
 from app.models.user import User
 from app.services import analytics_service
 
@@ -49,7 +49,7 @@ def analytics_trends(
 @router.get("/operators")
 def analytics_operators(
     db: Session = Depends(get_db),
-    user: User = Depends(require_any_role("red_lead", "blue_lead")),
+    user: User = Depends(require_role("admin")),
 ):
     """Per-operator metrics — for workload management dashboards."""
     return analytics_service.get_operators_analytics(db)
diff --git a/backend/tests/test_analytics_advanced_metrics.py b/backend/tests/test_analytics_advanced_metrics.py
new file mode 100644
index 0000000..e0a7c6a
--- /dev/null
+++ b/backend/tests/test_analytics_advanced_metrics.py
@@ -0,0 +1,87 @@
+"""Analytics and advanced metrics API tests (FASE-2.5, 2.6)."""
+
+import uuid
+
+from app.models.technique import Technique
+from app.models.test import Test
+from app.models.enums import TestState
+
+
+def test_analytics_coverage_flat_json(client, auth_headers, db):
+    t = Technique(mitre_id="T1001", name="Test Tech", tactic="discovery")
+    db.add(t)
+    db.commit()
+
+    r = client.get("/api/v1/analytics/coverage", headers=auth_headers)
+    assert r.status_code == 200
+    data = r.json()
+    assert isinstance(data, list)
+    assert any(row["mitre_id"] == "T1001" for row in data)
+    assert "tactic" in data[0]
+    assert "status" in data[0]
+
+
+def test_analytics_tests_date_filter(client, auth_headers, db, admin_user):
+    technique = Technique(mitre_id="T1002", name="Filter Tech", tactic="impact")
+    db.add(technique)
+    db.flush()
+    db.add(
+        Test(
+            name="dated test",
+            technique_id=technique.id,
+            state=TestState.draft,
+            created_by=admin_user.id,
+        ),
+    )
+    db.commit()
+
+    r = client.get(
+        "/api/v1/analytics/tests",
+        params={"date_from": "2020-01-01"},
+        headers=auth_headers,
+    )
+    assert r.status_code == 200
+    assert isinstance(r.json(), list)
+
+
+def test_analytics_operators_requires_admin(client, auth_headers, red_tech_headers):
+    client.cookies.clear()
+    denied = client.get("/api/v1/analytics/operators", headers=red_tech_headers)
+    assert denied.status_code == 403
+
+    client.cookies.clear()
+    ok = client.get("/api/v1/analytics/operators", headers=auth_headers)
+    assert ok.status_code == 200
+    assert isinstance(ok.json(), list)
+
+
+def test_coverage_by_tactic(client, auth_headers, db):
+    db.add(Technique(mitre_id="T2001", name="A", tactic="initial-access"))
+    db.add(Technique(mitre_id="T2002", name="B", tactic="initial-access"))
+    db.commit()
+
+    r = client.get("/api/v1/metrics/advanced/coverage-by-tactic", headers=auth_headers)
+    assert r.status_code == 200
+    rows = r.json()
+    assert isinstance(rows, list)
+    ia = next((x for x in rows if x["tactic"] == "initial-access"), None)
+    assert ia is not None
+    assert ia["total"] >= 2
+    assert "coverage_pct" in ia
+
+
+def test_never_tested_lists_untested_technique(client, auth_headers, db):
+    db.add(Technique(mitre_id="T9999", name="Never Run", tactic="collection"))
+    db.commit()
+
+    r = client.get("/api/v1/metrics/advanced/never-tested", headers=auth_headers)
+    assert r.status_code == 200
+    keys = {row["mitre_id"] for row in r.json()}
+    assert "T9999" in keys
+
+
+def test_avg_validation_time_empty(client, auth_headers):
+    r = client.get("/api/v1/metrics/advanced/avg-validation-time", headers=auth_headers)
+    assert r.status_code == 200
+    body = r.json()
+    assert body["total_validated"] == 0