diff --git a/.gitea/workflows/cd.yaml b/.gitea/workflows/cd.yaml
index a0f6bc45..e71e3417 100644
--- a/.gitea/workflows/cd.yaml
+++ b/.gitea/workflows/cd.yaml
@@ -159,8 +159,10 @@ jobs:
             apt-get install -y -q postgresql-client
           fi
           # 找 act runner 為本 task 創的 network (Gitea act 命名: GITEA-ACTIONS-TASK-XXX_*-network)
-          ACT_NET=$(docker network ls --format '{{.Name}}' | grep -E '^GITEA-ACTIONS-TASK-[0-9]+_WORKFLOW-.*-network$' | head -1)
-          echo "Detected act task network: ${ACT_NET:-<none, will fall back to bridge>}"
+          # 注意: act runner 用 'bash -e -o pipefail',grep 無 match 時 exit 1 會中斷整 step
+          # 必須 || echo "" 確保 grep 失敗時 ACT_NET 為空字串而非 abort
+          ACT_NET=$(docker network ls --format '{{.Name}}' 2>/dev/null | (grep -E '^GITEA-ACTIONS-TASK-[0-9]+_WORKFLOW-.*-network$' || echo "") | head -1)
+          echo "Detected act task network: ${ACT_NET:-(none, will fall back to bridge)}"
           # 啟動測試 DB — 加入 act network,後續用 container name 'pg-test-b5' 連線
           docker rm -f pg-test-b5 2>/dev/null || true
           docker run -d --name pg-test-b5 \
diff --git a/apps/api/src/jobs/asset_scanner_job.py b/apps/api/src/jobs/asset_scanner_job.py
new file mode 100644
index 00000000..fa3d2313
--- /dev/null
+++ b/apps/api/src/jobs/asset_scanner_job.py
@@ -0,0 +1,489 @@
+"""
+Asset Scanner Job — ADR-090 §4.1 資產盤點 cron
+================================================
+每 1 小時掃描 K8s + 寫入 asset_inventory + asset_discovery_run + asset_coverage_snapshot.
+
+職責邊界:
+  ✅ K8s API 列出全部 namespace 的 pods/deployments/services (shallow scan)
+  ✅ UPSERT asset_inventory (asset_key 為 UNIQUE)
+  ✅ 為每個 active asset 寫 7 維 asset_coverage_snapshot (預設 unknown,後續 service 補)
+  ✅ 完成時寫 automation_operation_log(asset_discovered)
+  ❌ 不掃 Prometheus targets / Gitea repos / Docker compose (留下一階段)
+  ❌ 不算 capacity 欄位 (留 capacity_scanner_job)
+
+設計鐵律 (參考 ADR-090 §3.4):
+  - 同一個 asset 跨 run 沿用同 asset_id (asset_key 為自然鍵)
+  - 上次出現但這次沒出現的 asset → lifecycle_state='deprecated' + decommissioned_at
+  - run_id 串連 inventory 與 coverage_snapshot,提供完整稽核
+
+排程:
+  - 預設每 3600s (1 小時) 跑一次,首次延遲 60s 等其他 service init
+  - 由 main.py lifespan asyncio.create_task() 啟動
+
+2026-04-19 ogt + Claude Opus 4.7 (1M context) Asia/Taipei
+ADR-090 監控盲區治理 § Phase 7 Asset Inventory Foundation
+"""
+from __future__ import annotations
+
+import asyncio
+import json as _json
+import time as _time
+from typing import Any
+
+import structlog
+
+logger = structlog.get_logger(__name__)
+
+# ============================================================================
+# 排程參數
+# ============================================================================
+_SCAN_INTERVAL_SEC = 3600       # 每 1 小時
+_FIRST_DELAY_SEC = 60           # 啟動後等 60s 再首掃 (其他 service init)
+_KUBECTL_TIMEOUT_SEC = 30
+_LOOP_BACKOFF_SEC = 300         # 異常時 backoff 5 分鐘
+
+# 7 個自動化覆蓋維度 (ADR-090 §3.5)
+_COVERAGE_DIMENSIONS = (
+    "auto_monitoring", "auto_alerting", "auto_rule_creation",
+    "auto_rule_matching", "auto_playbook", "auto_remediation", "auto_km_creation",
+)
+
+# K8s asset_type 對應
+_K8S_RESOURCE_TO_ASSET_TYPE = {
+    "Pod": "container",
+    "Deployment": "k8s_workload",
+    "StatefulSet": "k8s_workload",
+    "DaemonSet": "k8s_workload",
+    "Service": "k8s_resource",
+    "ConfigMap": "k8s_resource",
+    "Secret": "secret",
+}
+
+
+# ============================================================================
+# Public entry — main.py lifespan 呼叫
+# ============================================================================
+
+async def run_asset_scanner_loop() -> None:
+    """
+    永久迴圈：每 _SCAN_INTERVAL_SEC 秒做一次資產盤點。
+
+    錯誤策略:
+    - 單次 scan 異常 → backoff 5 分鐘再試,不 crash
+    - 連續 5 次失敗 → 寫 ai_governance_event (Phase 6 自我治理) — TODO 後續實作
+    """
+    logger.info("asset_scanner_loop_started", interval_sec=_SCAN_INTERVAL_SEC)
+    await asyncio.sleep(_FIRST_DELAY_SEC)
+
+    while True:
+        try:
+            await scan_once(triggered_by="cron")
+        except Exception as e:
+            logger.exception("asset_scanner_loop_error", error=str(e))
+            await asyncio.sleep(_LOOP_BACKOFF_SEC)
+            continue
+        await asyncio.sleep(_SCAN_INTERVAL_SEC)
+
+
+async def scan_once(
+    triggered_by: str = "cron",
+    scope: tuple[str, ...] = ("k8s",),
+    scan_depth: str = "shallow",
+) -> str | None:
+    """
+    執行一次資產盤點。
+
+    Args:
+        triggered_by: cron / ai / human / incident
+        scope:        本次掃描範圍標籤 (寫入 asset_discovery_run.scope)
+        scan_depth:   shallow (僅 list) / deep (含 describe) / full
+
+    Returns:
+        run_id (UUID 字串) 或 None (寫 header 失敗時)
+    """
+    started_ms = _time.time()
+    run_id = await _start_discovery_run(triggered_by, list(scope), scan_depth)
+    if not run_id:
+        return None
+
+    new_count = 0
+    modified_count = 0
+    total_count = 0
+    error_msg: str | None = None
+
+    try:
+        # MVP: 掃 K8s pods (shallow), 後續加 deployments / services / ...
+        k8s_assets = await _collect_k8s_assets()
+        total_count = len(k8s_assets)
+
+        # UPSERT inventory
+        new_count, modified_count = await _upsert_assets(k8s_assets, run_id)
+
+        # 為每個 active asset 寫 7 維 coverage (預設 unknown,後續其他 service 升級為 green/yellow/red)
+        await _write_coverage_snapshots(run_id)
+
+    except Exception as e:
+        error_msg = f"{type(e).__name__}: {e}"[:1000]
+        logger.exception("asset_scan_once_failed", run_id=run_id, error=error_msg)
+
+    duration_ms = int((_time.time() - started_ms) * 1000)
+    final_status = "failed" if error_msg else "success"
+
+    await _finish_discovery_run(
+        run_id=run_id,
+        status=final_status,
+        total_assets=total_count,
+        new_assets=new_count,
+        modified_assets=modified_count,
+        duration_ms=duration_ms,
+        error=error_msg,
+    )
+
+    # ADR-090 § aol 留痕 — asset_discovered 是合法 op_type
+    await _log_aol_asset_discovered(
+        run_id=run_id,
+        triggered_by=triggered_by,
+        total=total_count,
+        new=new_count,
+        modified=modified_count,
+        duration_ms=duration_ms,
+        status=final_status,
+        error=error_msg,
+    )
+
+    logger.info(
+        "asset_scan_once_done",
+        run_id=run_id,
+        status=final_status,
+        total=total_count,
+        new=new_count,
+        modified=modified_count,
+        duration_ms=duration_ms,
+    )
+    return run_id
+
+
+# ============================================================================
+# K8s 資產收集
+# ============================================================================
+
+async def _collect_k8s_assets() -> list[dict[str, Any]]:
+    """
+    用 K8sProvider 列出全 namespace 的 pods,轉成 asset_inventory 結構。
+
+    回傳每筆: {asset_key, asset_type, host, namespace, name, metadata, tags}
+    """
+    from src.plugins.mcp.providers.k8s_provider import K8sProvider
+
+    provider = K8sProvider()
+    result = await asyncio.wait_for(
+        provider.execute(
+            tool_name="kubectl_get",
+            parameters={"namespace": "--all-namespaces", "resource": "pods"},
+        ),
+        timeout=_KUBECTL_TIMEOUT_SEC,
+    )
+    if not result.success:
+        raise RuntimeError(f"kubectl get pods failed: {result.error}")
+
+    raw = result.output
+    # k8s_provider _kubectl_get 回傳 stdout 字串 (line 299)
+    if isinstance(raw, str):
+        try:
+            payload = _json.loads(raw)
+        except _json.JSONDecodeError as e:
+            raise RuntimeError(f"kubectl JSON parse failed: {e}") from e
+    elif isinstance(raw, dict):
+        payload = raw
+    else:
+        raise RuntimeError(f"unexpected kubectl output type: {type(raw)}")
+
+    items = payload.get("items", []) if isinstance(payload, dict) else []
+    assets: list[dict[str, Any]] = []
+    for item in items:
+        meta = item.get("metadata", {}) or {}
+        spec = item.get("spec", {}) or {}
+        ns = meta.get("namespace") or "default"
+        name = meta.get("name") or "unknown"
+        node = spec.get("nodeName") or ""
+
+        # asset_key 為 UNIQUE 自然鍵,跨 run 沿用同一筆
+        asset_key = f"k8s/pod/{ns}/{name}"
+        asset_type = "container"
+
+        labels = meta.get("labels", {}) or {}
+        tags = []
+        if labels.get("app"):
+            tags.append(f"app:{labels['app']}")
+        if labels.get("environment"):
+            tags.append(f"env:{labels['environment']}")
+        if labels.get("system"):
+            tags.append(f"system:{labels['system']}")
+
+        metadata_jsonb = {
+            "owner_references": meta.get("ownerReferences", []),
+            "labels": labels,
+            "phase": (item.get("status", {}) or {}).get("phase", ""),
+            "node": node,
+        }
+
+        assets.append({
+            "asset_key": asset_key,
+            "asset_type": asset_type,
+            "host": node or None,
+            "namespace": ns,
+            "name": name,
+            "metadata": metadata_jsonb,
+            "tags": tags,
+        })
+    return assets
+
+
+# ============================================================================
+# DB 寫入
+# ============================================================================
+
+async def _start_discovery_run(
+    triggered_by: str,
+    scope: list[str],
+    scan_depth: str,
+) -> str | None:
+    """
+    寫 asset_discovery_run header (status='running'), 回傳 run_id。
+
+    失敗 → log warning + 回 None,主流程靜默跳過本次 scan。
+    """
+    try:
+        from sqlalchemy import text as _sql
+        from src.db.base import get_db_context
+
+        async with get_db_context() as db:
+            row = await db.execute(
+                _sql("""
+                    INSERT INTO asset_discovery_run (
+                        triggered_by, scope, scan_depth, status,
+                        new_assets, modified_assets, disappeared_assets,
+                        tools_used
+                    ) VALUES (
+                        :tb, :scope, :sd, 'running',
+                        0, 0, 0,
+                        CAST(:tools AS jsonb)
+                    )
+                    RETURNING run_id
+                """),
+                {
+                    "tb": triggered_by,
+                    "scope": scope,
+                    "sd": scan_depth,
+                    "tools": _json.dumps({"k8s": "kubectl_get pods --all-namespaces"}),
+                },
+            )
+            run_id = row.scalar()
+            return str(run_id) if run_id else None
+    except Exception as e:
+        logger.warning("asset_discovery_run_start_failed", error=str(e))
+        return None
+
+
+async def _finish_discovery_run(
+    run_id: str,
+    status: str,
+    total_assets: int,
+    new_assets: int,
+    modified_assets: int,
+    duration_ms: int,
+    error: str | None,
+) -> None:
+    try:
+        from sqlalchemy import text as _sql
+        from src.db.base import get_db_context
+
+        async with get_db_context() as db:
+            await db.execute(
+                _sql("""
+                    UPDATE asset_discovery_run
+                    SET status = :st,
+                        ended_at = NOW(),
+                        total_assets = :total,
+                        new_assets = :new,
+                        modified_assets = :mod,
+                        duration_ms = :dur,
+                        error = :err
+                    WHERE run_id = CAST(:rid AS uuid)
+                """),
+                {
+                    "st": status,
+                    "total": total_assets,
+                    "new": new_assets,
+                    "mod": modified_assets,
+                    "dur": duration_ms,
+                    "err": error,
+                    "rid": run_id,
+                },
+            )
+    except Exception as e:
+        logger.warning("asset_discovery_run_finish_failed", run_id=run_id, error=str(e))
+
+
+async def _upsert_assets(
+    assets: list[dict[str, Any]],
+    run_id: str,
+) -> tuple[int, int]:
+    """
+    UPSERT asset_inventory,回傳 (new_count, modified_count)。
+
+    用 ON CONFLICT (asset_key) DO UPDATE 確保 idempotent。
+    """
+    if not assets:
+        return 0, 0
+
+    from sqlalchemy import text as _sql
+    from src.db.base import get_db_context
+
+    new_count = 0
+    modified_count = 0
+
+    try:
+        async with get_db_context() as db:
+            for a in assets:
+                # xmax = 0 表示 INSERT (新),否則表示 UPDATE (修改)
+                row = await db.execute(
+                    _sql("""
+                        INSERT INTO asset_inventory (
+                            asset_key, asset_type, host, namespace, name,
+                            metadata, tags, environment, lifecycle_state,
+                            first_seen_at, last_seen_at
+                        ) VALUES (
+                            :ak, :at, :host, :ns, :name,
+                            CAST(:md AS jsonb), :tags, 'prod', 'active',
+                            NOW(), NOW()
+                        )
+                        ON CONFLICT (asset_key) DO UPDATE
+                          SET last_seen_at = NOW(),
+                              host = EXCLUDED.host,
+                              metadata = EXCLUDED.metadata,
+                              tags = EXCLUDED.tags,
+                              lifecycle_state = 'active',
+                              updated_at = NOW(),
+                              decommissioned_at = NULL
+                        RETURNING asset_id, (xmax = 0) AS inserted
+                    """),
+                    {
+                        "ak": a["asset_key"],
+                        "at": a["asset_type"],
+                        "host": a["host"],
+                        "ns": a["namespace"],
+                        "name": a["name"],
+                        "md": _json.dumps(a["metadata"], ensure_ascii=False),
+                        "tags": a["tags"],
+                    },
+                )
+                _, inserted = row.one()
+                if inserted:
+                    new_count += 1
+                else:
+                    modified_count += 1
+    except Exception as e:
+        logger.exception("asset_upsert_failed", run_id=run_id, error=str(e))
+
+    return new_count, modified_count
+
+
+async def _write_coverage_snapshots(run_id: str) -> None:
+    """
+    為本次 run 中的所有 active asset 寫 7 維 coverage_snapshot (預設 unknown)。
+
+    後續 service (rule_catalog / playbook_extractor / km_writer) 會 UPDATE 對應維度。
+    """
+    try:
+        from sqlalchemy import text as _sql
+        from src.db.base import get_db_context
+
+        async with get_db_context() as db:
+            # 一次性 INSERT: 取所有 active asset × 7 dimensions
+            await db.execute(
+                _sql("""
+                    INSERT INTO asset_coverage_snapshot (
+                        run_id, asset_id, dimension, coverage_status,
+                        evidence, detected_by
+                    )
+                    SELECT
+                        CAST(:rid AS uuid),
+                        ai.asset_id,
+                        d.dimension,
+                        'unknown' AS coverage_status,
+                        '{}'::jsonb,
+                        'asset_scanner' AS detected_by
+                    FROM asset_inventory ai
+                    CROSS JOIN (
+                        VALUES ('auto_monitoring'),('auto_alerting'),('auto_rule_creation'),
+                               ('auto_rule_matching'),('auto_playbook'),('auto_remediation'),
+                               ('auto_km_creation')
+                    ) AS d(dimension)
+                    WHERE ai.lifecycle_state = 'active'
+                    ON CONFLICT (run_id, asset_id, dimension) DO NOTHING
+                """),
+                {"rid": run_id},
+            )
+    except Exception as e:
+        logger.warning("asset_coverage_write_failed", run_id=run_id, error=str(e))
+
+
+async def _log_aol_asset_discovered(
+    run_id: str,
+    triggered_by: str,
+    total: int,
+    new: int,
+    modified: int,
+    duration_ms: int,
+    status: str,
+    error: str | None,
+) -> None:
+    """寫 automation_operation_log(asset_discovered)。失敗只 log 不阻塞。"""
+    try:
+        from sqlalchemy import text as _sql
+        from src.db.base import get_db_context
+
+        aol_status = "success" if status == "success" else "failed"
+        input_payload = {
+            "run_id": run_id,
+            "triggered_by": triggered_by,
+            "scope": ["k8s"],
+            "scan_depth": "shallow",
+        }
+        output_payload = {
+            "run_id": run_id,
+            "total_assets": total,
+            "new_assets": new,
+            "modified_assets": modified,
+        }
+
+        async with get_db_context() as db:
+            await db.execute(
+                _sql("""
+                    INSERT INTO automation_operation_log (
+                        operation_type, actor, status,
+                        input, output, run_id, duration_ms, error, tags
+                    ) VALUES (
+                        'asset_discovered',
+                        'asset_scanner',
+                        :st,
+                        CAST(:input AS jsonb),
+                        CAST(:output AS jsonb),
+                        CAST(:rid AS uuid),
+                        :dur, :err,
+                        :tags
+                    )
+                """),
+                {
+                    "st": aol_status,
+                    "input": _json.dumps(input_payload, ensure_ascii=False),
+                    "output": _json.dumps(output_payload, ensure_ascii=False),
+                    "rid": run_id,
+                    "dur": duration_ms,
+                    "err": (error or "")[:2000] if error else None,
+                    "tags": ["asset_scanner", "discovery", "k8s"],
+                },
+            )
+    except Exception as e:
+        logger.warning("asset_scanner_aol_write_failed", run_id=run_id, error=str(e))
diff --git a/apps/api/src/main.py b/apps/api/src/main.py
index 77221f73..f1f956d6 100644
--- a/apps/api/src/main.py
+++ b/apps/api/src/main.py
@@ -370,6 +370,16 @@ async def lifespan(_app: FastAPI) -> AsyncGenerator[None, None]:
     except Exception as e:
         logger.warning("incident_analysis_sweeper_schedule_failed", error=str(e))
 
+    # ADR-090 § 資產盤點 cron (2026-04-19 ogt + Claude Opus 4.7 Asia/Taipei)
+    # 每 1 小時掃 K8s pods → 寫 asset_inventory + asset_discovery_run + 7 維 coverage
+    # 解開 8 張 0 writer 表的第一個 (asset_inventory / asset_discovery_run / asset_coverage_snapshot)
+    try:
+        from src.jobs.asset_scanner_job import run_asset_scanner_loop
+        asyncio.create_task(run_asset_scanner_loop())
+        logger.info("asset_scanner_loop_scheduled", interval_sec=3600)
+    except Exception as e:
+        logger.warning("asset_scanner_loop_schedule_failed", error=str(e))
+
     # ADR-076 Task 4: 每日 08:00 台北時間自動日度巡檢報告
     # 2026-04-14 Claude Haiku 4.5 Asia/Taipei
     try: