diff --git a/apps/api/pyproject.toml b/apps/api/pyproject.toml
index 11ea5dc7..2c6c4d00 100644
--- a/apps/api/pyproject.toml
+++ b/apps/api/pyproject.toml
@@ -39,6 +39,10 @@ dependencies = [
     "claude-agent-sdk>=0.1.50",
     # Sprint 5.1 2026-04-08 Claude Sonnet 4.6: Service Registry YAML 讀取
     "pyyaml>=6.0.0",
+    # Phase 4 ADR-084: 動態異常偵測 (2026-04-15 ogt: 補齊缺失依賴)
+    "statsmodels>=0.14.0",
+    "drain3>=0.9.11",
+    "sse-starlette>=1.8.0",
 ]
 
 # [tool.uv.sources]
diff --git a/apps/api/src/main.py b/apps/api/src/main.py
index 4325fd9e..5a86089a 100644
--- a/apps/api/src/main.py
+++ b/apps/api/src/main.py
@@ -259,25 +259,29 @@ async def lifespan(_app: FastAPI) -> AsyncGenerator[None, None]:
 
         restored = 0
         for record in records:
-            from src.models.incident import Incident
-            incident = Incident(
-                incident_id=record.incident_id,
-                status=record.status,
-                severity=record.severity,
-                signals=record.signals or [],
-                affected_services=record.affected_services or [],
-                decision_chain=record.decision_chain,
-                proposal_ids=record.proposal_ids or [],
-                outcome=record.outcome,
-                created_at=record.created_at,
-                updated_at=record.updated_at,
-                resolved_at=record.resolved_at,
-                closed_at=record.closed_at,
-                ttl_days=record.ttl_days,
-                vectorized=record.vectorized,
-            )
-            if await incident_service.save_to_working_memory(incident):
-                restored += 1
+            try:
+                from src.models.incident import Incident
+                incident = Incident(
+                    incident_id=record.incident_id,
+                    status=record.status,
+                    severity=record.severity,
+                    signals=record.signals or [],
+                    affected_services=record.affected_services or [],
+                    decision_chain=record.decision_chain,
+                    proposal_ids=record.proposal_ids or [],
+                    outcome=record.outcome,
+                    created_at=record.created_at,
+                    updated_at=record.updated_at,
+                    resolved_at=record.resolved_at,
+                    closed_at=record.closed_at,
+                    ttl_days=record.ttl_days,
+                    vectorized=record.vectorized,
+                )
+                if await incident_service.save_to_working_memory(incident):
+                    restored += 1
+            except Exception:
+                # 舊資料 source 值不合法（node-exporter 等）→ 跳過
+                pass
 
         logger.info("working_memory_warmed_up", restored=restored, total=len(records))
     except Exception as e: