Defer canvas edge deletes to Save and cascade orphan Fabric on NE detach.

Queue fabric edge deletes until Save with undo-safe pending state; hard-delete topology/LLDP placeholders from the canvas; purge fully orphaned fabric nodes after inventory detach, with a periodic reconcile GC.

Co-authored-by: Cursor <cursoragent@cursor.com>

netx_api/app_shutdown.py

@@ -38,6 +38,13 @@ def shutdown_runtime(*, reason: str = "lifespan") -> None:
     except Exception:  # noqa: BLE001
         _log.exception("stop_port_traffic_scheduler failed")
 
+    try:
+        from .fabric_reconcile_scheduler import stop_fabric_reconcile_scheduler
+
+        stop_fabric_reconcile_scheduler()
+    except Exception:  # noqa: BLE001
+        _log.exception("stop_fabric_reconcile_scheduler failed")
+
     try:
         import netx_api.ume_support as ume_support
 

netx_api/config.py

@@ -86,6 +86,10 @@ class Settings(BaseSettings):
     # Reclaim hung discover jobs (updated_at / created_at older than these).
     lldp_collect_stale_run_sec: int = 7200
     lldp_collect_pending_stale_sec: int = 300
+    # Fabric inventory lifecycle: detach dangling refs + purge fully orphaned nodes.
+    fabric_reconcile_scheduler_enabled: bool = True
+    # Default 6h — light full-table GC; deletes still purge orphans immediately on detach.
+    fabric_reconcile_interval_sec: int = 21600
     # Port traffic monitoring (CLI rate bit/s samples)
     port_traffic_scheduler_enabled: bool = True
     port_traffic_scheduler_tick_sec: int = 15
@@ -141,7 +145,7 @@ class Settings(BaseSettings):
     alembic_upgrade_on_start: bool = True
     # Optional dedicated SQLAlchemy URL for /v1/sql/* (read-only DB role recommended).
     sql_readonly_database_url: str = ""
-    # When true (default), API also runs config_sync / lldp / port_traffic schedulers.
+    # When true (default), API also runs config_sync / lldp / port_traffic / fabric_reconcile schedulers.
     # Production split: set false and run `python -m netx_api.worker` beside the API.
     run_inline_schedulers: bool = True
     # Worker→API heartbeat file (used when run_inline_schedulers=false).

netx_api/fabric_reconcile_scheduler.py

@@ -0,0 +1,99 @@
+"""Periodic Fabric inventory reconcile: dangling detach + fully-orphaned GC."""
+
+from __future__ import annotations
+
+import logging
+import threading
+import time
+from typing import Any
+
+from .config import settings
+from .db import SessionLocal
+
+_log = logging.getLogger("netx.fabric_reconcile.scheduler")
+_stop = threading.Event()
+_thread: threading.Thread | None = None
+_last_run_mono: float = 0.0
+_last_stats: dict[str, Any] | None = None
+
+
+def run_fabric_reconcile_once() -> dict[str, Any]:
+    """Detach dangling managed/UME refs and purge fully orphaned fabric nodes."""
+    global _last_run_mono, _last_stats
+    from .topology_inventory_lifecycle import reconcile_dangling_fabric_links
+
+    db = SessionLocal()
+    try:
+        stats = reconcile_dangling_fabric_links(db, sweep_orphans=True)
+        db.commit()
+        _last_run_mono = time.monotonic()
+        _last_stats = dict(stats)
+        purged = int(stats.get("purged_orphans") or 0)
+        dangling = int(stats.get("dangling_managed_refs") or 0) + int(
+            stats.get("dangling_ume_refs") or 0
+        )
+        if purged or dangling:
+            _log.info(
+                "fabric reconcile done dangling_m=%s dangling_u=%s purged_orphans=%s edges_deleted=%s",
+                stats.get("dangling_managed_refs"),
+                stats.get("dangling_ume_refs"),
+                purged,
+                stats.get("edges_deleted"),
+            )
+        else:
+            _log.debug("fabric reconcile idle")
+        return stats
+    except Exception:
+        db.rollback()
+        raise
+    finally:
+        db.close()
+
+
+def _loop() -> None:
+    interval = max(300, int(getattr(settings, "fabric_reconcile_interval_sec", 21600) or 21600))
+    # Short first delay so API/worker boot is not blocked by a full-table scan.
+    startup_delay = min(120, interval)
+    _log.info(
+        "fabric reconcile scheduler started interval=%ss startup_delay=%ss",
+        interval,
+        startup_delay,
+    )
+    _stop.wait(startup_delay)
+    while not _stop.is_set():
+        try:
+            if bool(getattr(settings, "fabric_reconcile_scheduler_enabled", True)):
+                run_fabric_reconcile_once()
+        except Exception:
+            _log.exception("fabric reconcile tick failed")
+        _stop.wait(interval)
+    _log.info("fabric reconcile scheduler stopped")
+
+
+def start_fabric_reconcile_scheduler() -> None:
+    global _thread
+    if not bool(getattr(settings, "fabric_reconcile_scheduler_enabled", True)):
+        _log.info("fabric reconcile scheduler disabled by settings")
+        return
+    if _thread and _thread.is_alive():
+        return
+    _stop.clear()
+    _thread = threading.Thread(target=_loop, name="fabric-reconcile-scheduler", daemon=True)
+    _thread.start()
+
+
+def stop_fabric_reconcile_scheduler() -> None:
+    _stop.set()
+
+
+def fabric_reconcile_scheduler_status() -> dict[str, Any]:
+    now = time.monotonic()
+    return {
+        "running": bool(_thread is not None and _thread.is_alive()),
+        "last_run_age_sec": (now - _last_run_mono) if _last_run_mono else None,
+        "last_stats": dict(_last_stats) if _last_stats else None,
+        "interval_sec": max(
+            300, int(getattr(settings, "fabric_reconcile_interval_sec", 21600) or 21600)
+        ),
+        "enabled": bool(getattr(settings, "fabric_reconcile_scheduler_enabled", True)),
+    }

netx_api/metrics_router.py

@@ -110,12 +110,19 @@ def _prom_lines(metrics: dict[str, Any]) -> str:
         ("config_sync", "netx_config_sync_scheduler_running"),
         ("lldp_collect", "netx_lldp_collect_scheduler_running"),
         ("port_traffic", "netx_port_traffic_scheduler_running"),
+        ("fabric_reconcile", "netx_fabric_reconcile_scheduler_running"),
     ):
         block = sched.get(name) or metrics.get(name) or {}
         if "running" in block:
             lines.append(f'{key} {1 if block.get("running") else 0}')
-        if block.get("last_tick_age_sec") is not None:
+        age_key = "last_run_age_sec" if name == "fabric_reconcile" else "last_tick_age_sec"
-            lines.append(f"netx_{name}_tick_age_seconds {block['last_tick_age_sec']}")
+        if block.get(age_key) is not None:
+            metric_age = (
+                "netx_fabric_reconcile_run_age_seconds"
+                if name == "fabric_reconcile"
+                else f"netx_{name}_tick_age_seconds"
+            )
+            lines.append(f"{metric_age} {block[age_key]}")
     pt = metrics.get("port_traffic") or {}
     if pt.get("last_purge_age_sec") is not None:
         lines.append(f'netx_port_traffic_purge_age_seconds {pt["last_purge_age_sec"]}')

netx_api/scheduler_heartbeat.py

@@ -61,6 +61,12 @@ def local_device_scheduler_status(*, role: str = "unknown") -> dict[str, Any]:
         out["port_traffic"] = port_traffic_scheduler_status()
     except Exception:  # noqa: BLE001
         out["port_traffic"] = {"running": False, "error": "unavailable"}
+    try:
+        from .fabric_reconcile_scheduler import fabric_reconcile_scheduler_status
+
+        out["fabric_reconcile"] = fabric_reconcile_scheduler_status()
+    except Exception:  # noqa: BLE001
+        out["fabric_reconcile"] = {"running": False, "error": "unavailable"}
     return out
 
 

netx_api/topology_inventory_lifecycle.py

@@ -115,39 +115,105 @@ def _strip_membership_ids(
 
 
 def detach_fabric_from_managed(db: Session, managed_ne_ids: list[str]) -> dict[str, int]:
-    """Clear fabric.managed_ne_id for deleted ManagedNEs; keep nodes/placements/edges."""
+    """Clear fabric.managed_ne_id for deleted ManagedNEs; purge nodes that become fully orphaned."""
     ids = _norm_ids(managed_ne_ids)
     if not ids:
-        return {"detached_nodes": 0, "membership_views": 0}
+        return {
+            "detached_nodes": 0,
+            "membership_views": 0,
+            "purged_orphans": 0,
+            "edges_deleted": 0,
+            "placements_deleted": 0,
+        }
     now = _utcnow()
     rows = (
         db.query(TopoFabricNode)
         .filter(TopoFabricNode.managed_ne_id.in_(ids))
         .all()
     )
+    fabric_ids = [str(r.id) for r in rows]
     for row in rows:
         row.managed_ne_id = None
         row.updated_at = now
     views = _strip_membership_ids(db, managed_ne_ids=set(ids))
-    return {"detached_nodes": len(rows), "membership_views": views}
+    db.flush()
+    purged = purge_fully_orphaned_fabric_nodes(db, fabric_ids)
+    return {
+        "detached_nodes": len(rows),
+        "membership_views": views,
+        "purged_orphans": int(purged.get("deleted") or 0),
+        "edges_deleted": int(purged.get("edges_deleted") or 0),
+        "placements_deleted": int(purged.get("placements_deleted") or 0),
+    }
 
 
 def detach_fabric_from_ume(db: Session, ume_ne_ids: list[str]) -> dict[str, int]:
-    """Clear fabric.ume_ne_id for deleted UME inventory rows; keep topology traces."""
+    """Clear fabric.ume_ne_id for deleted UME inventory rows; purge nodes that become fully orphaned."""
     ids = _norm_ids(ume_ne_ids)
     if not ids:
-        return {"detached_nodes": 0, "membership_views": 0}
+        return {
+            "detached_nodes": 0,
+            "membership_views": 0,
+            "purged_orphans": 0,
+            "edges_deleted": 0,
+            "placements_deleted": 0,
+        }
     now = _utcnow()
     rows = db.query(TopoFabricNode).filter(TopoFabricNode.ume_ne_id.in_(ids)).all()
+    fabric_ids = [str(r.id) for r in rows]
     for row in rows:
         row.ume_ne_id = None
         row.updated_at = now
     views = _strip_membership_ids(db, ume_ne_ids=set(ids))
-    return {"detached_nodes": len(rows), "membership_views": views}
+    db.flush()
+    purged = purge_fully_orphaned_fabric_nodes(db, fabric_ids)
+    return {
+        "detached_nodes": len(rows),
+        "membership_views": views,
+        "purged_orphans": int(purged.get("deleted") or 0),
+        "edges_deleted": int(purged.get("edges_deleted") or 0),
+        "placements_deleted": int(purged.get("placements_deleted") or 0),
+    }
 
 
-def reconcile_dangling_fabric_links(db: Session) -> dict[str, int]:
+def purge_fully_orphaned_fabric_nodes(
-    """Unbind fabric ids that no longer exist in managed_ne / ume_inventory_ne."""
+    db: Session,
+    fabric_node_ids: list[str] | None = None,
+) -> dict[str, int]:
+    """Hard-delete fabric nodes with no managed_ne_id and no ume_ne_id (cascades edges/placements).
+
+    When ``fabric_node_ids`` is None, sweeps the whole fabric table (GC).
+    Caller commits.
+    """
+    if fabric_node_ids is None:
+        rows = [
+            n
+            for n in db.query(TopoFabricNode).all()
+            if not str(n.managed_ne_id or "").strip() and not str(n.ume_ne_id or "").strip()
+        ]
+    else:
+        ids = _norm_ids(fabric_node_ids)
+        if not ids:
+            return {"deleted": 0, "edges_deleted": 0, "placements_deleted": 0}
+        candidates = db.query(TopoFabricNode).filter(TopoFabricNode.id.in_(ids)).all()
+        rows = [
+            n
+            for n in candidates
+            if not str(n.managed_ne_id or "").strip() and not str(n.ume_ne_id or "").strip()
+        ]
+    return _delete_fabric_node_rows(db, rows)
+
+
+def reconcile_dangling_fabric_links(
+    db: Session,
+    *,
+    sweep_orphans: bool = True,
+) -> dict[str, int]:
+    """Unbind fabric ids that no longer exist in managed_ne / ume_inventory_ne.
+
+    Detach paths purge nodes that become fully orphaned. When ``sweep_orphans`` is True
+    (default), also GC any remaining fully orphaned fabric nodes.
+    """
     managed_alive = {str(x[0]) for x in db.query(ManagedNE.id).all() if str(x[0] or "").strip()}
     ume_alive = {
         str(x[0]) for x in db.query(UmeInventoryNE.ne_id).all() if str(x[0] or "").strip()
@@ -163,6 +229,21 @@ def reconcile_dangling_fabric_links(db: Session) -> dict[str, int]:
             dangling_u.append(uid)
     m_stats = detach_fabric_from_managed(db, dangling_m)
     u_stats = detach_fabric_from_ume(db, dangling_u)
+    gc = (
+        purge_fully_orphaned_fabric_nodes(db, None)
+        if sweep_orphans
+        else {"deleted": 0, "edges_deleted": 0, "placements_deleted": 0}
+    )
+    purged = (
+        int(m_stats.get("purged_orphans") or 0)
+        + int(u_stats.get("purged_orphans") or 0)
+        + int(gc.get("deleted") or 0)
+    )
+    edges_deleted = (
+        int(m_stats.get("edges_deleted") or 0)
+        + int(u_stats.get("edges_deleted") or 0)
+        + int(gc.get("edges_deleted") or 0)
+    )
     return {
         "dangling_managed_refs": len(set(dangling_m)),
         "dangling_ume_refs": len(set(dangling_u)),
@@ -170,6 +251,9 @@ def reconcile_dangling_fabric_links(db: Session) -> dict[str, int]:
         "detached_ume_nodes": int(u_stats.get("detached_nodes") or 0),
         "membership_views": int(m_stats.get("membership_views") or 0)
         + int(u_stats.get("membership_views") or 0),
+        "purged_orphans": purged,
+        "edges_deleted": edges_deleted,
+        "gc_orphans": int(gc.get("deleted") or 0),
     }
 
 
@@ -218,23 +302,11 @@ def _strip_fabric_ids_from_membership(db: Session, fabric_ids: set[str]) -> int:
     return touched
 
 
-def delete_fabric_nodes(db: Session, fabric_node_ids: list[str]) -> dict[str, int]:
+def _delete_fabric_node_rows(db: Session, rows: list[TopoFabricNode]) -> dict[str, int]:
-    """Hard-delete fabric nodes (placements + edges). Does not touch managed/UME inventory."""
+    """Delete fabric rows + incident edges + placements. Caller commits."""
-    ids = _norm_ids(fabric_node_ids)
+    ids = [str(r.id) for r in rows]
     if not ids:
-        raise HTTPException(status_code=400, detail="fabric_node_ids_required")
+        return {"deleted": 0, "edges_deleted": 0, "placements_deleted": 0}
-    rows = db.query(TopoFabricNode).filter(TopoFabricNode.id.in_(ids)).all()
-    found = {str(r.id): r for r in rows}
-    missing = [i for i in ids if i not in found]
-    if missing:
-        raise HTTPException(status_code=404, detail=f"fabric_node_not_found:{missing[0]}")
-    blocked = [i for i, r in found.items() if not fabric_node_is_deletable(db, r)]
-    if blocked:
-        raise HTTPException(
-            status_code=400,
-            detail=f"fabric_node_not_deletable:{blocked[0]}",
-        )
-
     edge_ids = [
         str(e.id)
         for e in db.query(TopoFabricEdge)
@@ -258,6 +330,84 @@ def delete_fabric_nodes(db: Session, fabric_node_ids: list[str]) -> dict[str, in
     _strip_fabric_ids_from_membership(db, set(ids))
     for r in rows:
         db.delete(r)
+    return {
+        "deleted": len(rows),
+        "edges_deleted": len(edge_ids),
+        "placements_deleted": int(placements or 0),
+    }
+
+
+def delete_fabric_nodes(db: Session, fabric_node_ids: list[str]) -> dict[str, int]:
+    """Hard-delete fabric nodes (placements + edges). Does not touch managed/UME inventory."""
+    ids = _norm_ids(fabric_node_ids)
+    if not ids:
+        raise HTTPException(status_code=400, detail="fabric_node_ids_required")
+    rows = db.query(TopoFabricNode).filter(TopoFabricNode.id.in_(ids)).all()
+    found = {str(r.id): r for r in rows}
+    missing = [i for i in ids if i not in found]
+    if missing:
+        raise HTTPException(status_code=404, detail=f"fabric_node_not_found:{missing[0]}")
+    blocked = [i for i, r in found.items() if not fabric_node_is_deletable(db, r)]
+    if blocked:
+        raise HTTPException(
+            status_code=400,
+            detail=f"fabric_node_not_deletable:{blocked[0]}",
+        )
+
+    out = _delete_fabric_node_rows(db, rows)
+    db.commit()
+    try:
+        from .topology_service import refresh_fabric_stats
+
+        refresh_fabric_stats(db)
+    except Exception:  # noqa: BLE001
+        pass
+    return out
+
+
+def purge_placeholder_fabric_nodes(db: Session, fabric_node_ids: list[str]) -> dict[str, int]:
+    """Hard-delete LLDP/topology placeholders: ManagedNE + fabric node + edges + placements.
+
+    Rejects real inventory (manual / ume_sync), WebCRT sessions, and UME-only fabric rows.
+    """
+    ids = _norm_ids(fabric_node_ids)
+    if not ids:
+        raise HTTPException(status_code=400, detail="fabric_node_ids_required")
+    rows = db.query(TopoFabricNode).filter(TopoFabricNode.id.in_(ids)).all()
+    found = {str(r.id): r for r in rows}
+    missing = [i for i in ids if i not in found]
+    if missing:
+        raise HTTPException(status_code=404, detail=f"fabric_node_not_found:{missing[0]}")
+
+    managed_rows: list[ManagedNE] = []
+    managed_ids: set[str] = set()
+    for fid, fab in found.items():
+        mid = str(fab.managed_ne_id or "").strip()
+        uid = str(fab.ume_ne_id or "").strip()
+        if not mid:
+            if uid:
+                raise HTTPException(
+                    status_code=400,
+                    detail=f"fabric_node_not_placeholder:{fid}",
+                )
+            # Orphan fabric — allow purge (same as fabric delete).
+            continue
+        mrow = db.get(ManagedNE, mid)
+        if mrow is None:
+            continue
+        if not is_placeholder_ne_source(mrow.source):
+            raise HTTPException(
+                status_code=400,
+                detail=f"fabric_node_not_placeholder:{fid}",
+            )
+        if mid not in managed_ids:
+            managed_ids.add(mid)
+            managed_rows.append(mrow)
+
+    out = _delete_fabric_node_rows(db, rows)
+    for mrow in managed_rows:
+        db.delete(mrow)
+    membership_views = _strip_membership_ids(db, managed_ne_ids=managed_ids)
     db.commit()
     try:
         from .topology_service import refresh_fabric_stats
@@ -266,9 +416,9 @@ def delete_fabric_nodes(db: Session, fabric_node_ids: list[str]) -> dict[str, in
     except Exception:  # noqa: BLE001
         pass
     return {
-        "deleted": len(rows),
+        **out,
-        "edges_deleted": len(edge_ids),
+        "managed_deleted": len(managed_rows),
-        "placements_deleted": int(placements or 0),
+        "membership_views": membership_views,
     }
 
 

netx_api/topology_router.py

@@ -205,20 +205,30 @@ def api_fabric_discover(
 @router.post("/fabric/cleanup-duplicates")
 def api_fabric_cleanup_duplicates(db: Session = Depends(get_db)) -> dict[str, Any]:
     """Merge duplicate fabric nodes (same managed/ume/name/ip) and retarget edges."""
-    from .topology_inventory_lifecycle import reconcile_dangling_fabric_links
+    from .topology_inventory_lifecycle import (
+        purge_fully_orphaned_fabric_nodes,
+        reconcile_dangling_fabric_links,
+    )
 
-    link_stats = reconcile_dangling_fabric_links(db)
+    # Detach dangling first but defer full orphan GC until after absorb/merge.
+    link_stats = reconcile_dangling_fabric_links(db, sweep_orphans=False)
     result = merge_duplicate_fabric_nodes(db)
+    gc = purge_fully_orphaned_fabric_nodes(db, None)
     db.commit()
-    return {"ok": True, **result, "reconcile_links": link_stats}
+    return {
+        "ok": True,
+        **result,
+        "reconcile_links": link_stats,
+        "purged_orphans": gc,
+    }
 
 
 @router.post("/fabric/reconcile-links")
 def api_fabric_reconcile_links(db: Session = Depends(get_db)) -> dict[str, Any]:
-    """Detach fabric refs whose managed/UME inventory rows no longer exist."""
+    """Detach fabric refs whose managed/UME inventory rows no longer exist; GC full orphans."""
     from .topology_inventory_lifecycle import reconcile_dangling_fabric_links
 
-    stats = reconcile_dangling_fabric_links(db)
+    stats = reconcile_dangling_fabric_links(db, sweep_orphans=True)
     db.commit()
     return {"ok": True, **stats}
 
@@ -467,6 +477,17 @@ def api_delete_fabric_nodes(
     return delete_fabric_nodes(db, body.fabric_node_ids)
 
 
+@router.post("/fabric/nodes/purge-placeholders")
+def api_purge_placeholder_fabric_nodes(
+    body: FabricNodesDeleteRequest,
+    db: Session = Depends(get_db),
+) -> dict[str, Any]:
+    """Hard-delete topology/LLDP placeholder ManagedNE + fabric node + incident edges."""
+    from .topology_inventory_lifecycle import purge_placeholder_fabric_nodes
+
+    return purge_placeholder_fabric_nodes(db, body.fabric_node_ids)
+
+
 @router.post("/slices/generate")
 def api_generate_slices(
     body: SliceGenerateRequest,

netx_api/topology_schemas.py

@@ -522,6 +522,14 @@ class FabricNodesDeleteOut(BaseModel):
     placements_deleted: int = 0
 
 
+class FabricPlaceholderPurgeOut(BaseModel):
+    deleted: int = 0
+    edges_deleted: int = 0
+    placements_deleted: int = 0
+    managed_deleted: int = 0
+    membership_views: int = 0
+
+
 class SliceGenerateRequest(BaseModel):
     folder_id: str
     template: str = Field(description="core_only | core_agg | agg_access")

netx_api/ume_runtime.py

@@ -49,6 +49,7 @@ _schedule_log = logging.getLogger("netx.ume.schedule")
 def start_device_schedulers() -> None:
     """Start device-facing periodic collectors (safe to call once per process)."""
     from .config_sync_scheduler import start_config_sync_scheduler
+    from .fabric_reconcile_scheduler import start_fabric_reconcile_scheduler
     from .lldp_collect_scheduler import start_lldp_collect_scheduler
     from .port_traffic_scheduler import start_port_traffic_scheduler
     from .scheduler_heartbeat import start_scheduler_heartbeat_publisher
@@ -56,6 +57,7 @@ def start_device_schedulers() -> None:
     start_config_sync_scheduler()
     start_lldp_collect_scheduler()
     start_port_traffic_scheduler()
+    start_fabric_reconcile_scheduler()
     # Publish status so API /metrics can see collectors when run in a split worker.
     role = "api_inline" if bool(getattr(settings, "run_inline_schedulers", True)) else "worker"
     start_scheduler_heartbeat_publisher(role=role)

netx_api/worker.py

@@ -4,7 +4,7 @@ Optional when ``NETX_RUN_INLINE_SCHEDULERS=false`` (API does not start collector
 
     python -m netx_api.worker
 
-Starts: config_sync, lldp_collect, port_traffic tick loops.
+Starts: config_sync, lldp_collect, port_traffic, fabric_reconcile tick loops.
 UME WS / keepalive remain in the API process (token + alarm coordination).
 By default the API runs collectors inline — no separate worker needed.
 """
@@ -45,7 +45,9 @@ def main() -> None:
         log_runtime_budget(role="worker")
     except Exception:
         _log.exception("worker runtime budget log failed")
-    _log.info("netx worker schedulers started (config_sync, lldp_collect, port_traffic)")
+    _log.info(
+        "netx worker schedulers started (config_sync, lldp_collect, port_traffic, fabric_reconcile)"
+    )
 
     while not stop.is_set():
         time.sleep(1.0)

tests/test_topology.py

@@ -1524,7 +1524,8 @@ Management Addresses:
         self.db.delete(ne_b)
         self.db.commit()
 
-    def test_delete_managed_detaches_fabric_keeps_topology(self) -> None:
+    def test_delete_managed_purges_orphan_fabric_and_edges(self) -> None:
+        """Managed-only delete → detach then purge fabric node + incident edges."""
         from netx_api import ne_service
         from netx_api.topology_inventory_lifecycle import reconcile_dangling_fabric_links
 
@@ -1551,6 +1552,7 @@ Management Addresses:
             id=f"peer-{suffix}",
             name=f"PEER-{suffix}",
             ip=f"10.66.{(int(suffix[:2], 16) % 200) + 1}.2",
+            ume_ne_id=f"ume-peer-{suffix}",
         )
         self.db.add(peer)
         self.db.commit()
@@ -1563,28 +1565,23 @@ Management Addresses:
             source="lldp",
         )
         self.db.commit()
+        edge_id = str(edge.id)
 
         ne_service.delete_managed_ne(self.db, ne.id)
+        self.db.expire_all()
 
-        fab = self.db.get(TopoFabricNode, fid)
+        self.assertIsNone(self.db.get(TopoFabricNode, fid))
-        self.assertIsNotNone(fab)
+        self.assertIsNone(self.db.get(TopoFabricEdge, edge_id))
-        assert fab is not None
-        self.assertFalse(str(fab.managed_ne_id or "").strip())
         self.assertEqual(
             self.db.query(TopoViewNode)
             .filter(TopoViewNode.view_id == view.id, TopoViewNode.fabric_node_id == fid)
             .count(),
-            1,
+            0,
         )
-        self.assertIsNotNone(self.db.get(TopoFabricEdge, edge.id))
+        # Peer still UME-linked — not purged.
+        self.assertIsNotNone(self.db.get(TopoFabricNode, peer.id))
 
-        orphaned = svc.list_fabric_nodes(self.db, link_status="orphaned", page_size=500)
+        # Historical dangling ref → detach then purge (fully orphaned).
-        self.assertTrue(any(x["id"] == fid for x in orphaned["items"]))
-        hit = next(x for x in orphaned["items"] if x["id"] == fid)
-        self.assertEqual(hit["link_status"], "orphaned")
-        self.assertFalse(hit["managed_alive"])
-
-        # Historical dangling ref (pre-lifecycle) is cleared by reconcile.
         ghost_id = f"ghost-{suffix}"
         dangling = TopoFabricNode(
             id=f"dang-{suffix}",
@@ -1596,9 +1593,122 @@ Management Addresses:
         self.db.commit()
         stats = reconcile_dangling_fabric_links(self.db)
         self.db.commit()
+        self.db.expire_all()
         self.assertGreaterEqual(int(stats["detached_managed_nodes"]), 1)
-        self.db.refresh(dangling)
+        self.assertGreaterEqual(int(stats["purged_orphans"]), 1)
-        self.assertFalse(str(dangling.managed_ne_id or "").strip())
+        self.assertIsNone(self.db.get(TopoFabricNode, dangling.id))
+
+    def test_both_bound_keeps_fabric_until_fully_orphaned(self) -> None:
+        from netx_api import ne_service
+        from netx_api.topology_inventory_lifecycle import detach_fabric_from_ume
+
+        suffix = uuid4().hex[:8]
+        ne = ManagedNE(
+            id=f"both-m-{suffix}",
+            name=f"BOTH-{suffix}",
+            vendor="Cisco",
+            device_type="cisco_ios",
+            ip_address=f"10.67.{(int(suffix[:2], 16) % 200) + 1}.1",
+        )
+        self.db.add(ne)
+        self.db.commit()
+        fab = svc.ensure_fabric_node_for_managed(self.db, ne)
+        fab.ume_ne_id = f"ume-both-{suffix}"
+        self.db.commit()
+        peer = TopoFabricNode(
+            id=f"both-peer-{suffix}",
+            name=f"BP-{suffix}",
+            ip=f"10.67.{(int(suffix[:2], 16) % 200) + 1}.2",
+            ume_ne_id=f"ume-bp-{suffix}",
+        )
+        self.db.add(peer)
+        self.db.commit()
+        edge, _ = svc.upsert_fabric_edge(
+            self.db,
+            a_node_id=fab.id,
+            b_node_id=peer.id,
+            a_port="Gi1/0",
+            b_port="Gi1/1",
+            source="lldp",
+        )
+        self.db.commit()
+        edge_id = str(edge.id)
+        fab_id = str(fab.id)
+        ume_id = str(fab.ume_ne_id)
+
+        ne_service.delete_managed_ne(self.db, ne.id)
+        self.db.expire_all()
+        kept = self.db.get(TopoFabricNode, fab_id)
+        self.assertIsNotNone(kept)
+        assert kept is not None
+        self.assertFalse(str(kept.managed_ne_id or "").strip())
+        self.assertEqual(str(kept.ume_ne_id or "").strip(), ume_id)
+        self.assertIsNotNone(self.db.get(TopoFabricEdge, edge_id))
+
+        detach_fabric_from_ume(self.db, [ume_id])
+        self.db.commit()
+        self.db.expire_all()
+        self.assertIsNone(self.db.get(TopoFabricNode, fab_id))
+        self.assertIsNone(self.db.get(TopoFabricEdge, edge_id))
+
+    def test_ume_only_detach_purges_orphan(self) -> None:
+        from netx_api.topology_inventory_lifecycle import detach_fabric_from_ume
+
+        suffix = uuid4().hex[:8]
+        ume_id = f"ume-only-{suffix}"
+        fab = TopoFabricNode(
+            id=f"uo-{suffix}",
+            name=f"UO-{suffix}",
+            ip="10.68.0.1",
+            ume_ne_id=ume_id,
+        )
+        peer = TopoFabricNode(
+            id=f"uo-peer-{suffix}",
+            name=f"UOP-{suffix}",
+            ip="10.68.0.2",
+            ume_ne_id=f"ume-uop-{suffix}",
+        )
+        self.db.add(fab)
+        self.db.add(peer)
+        self.db.commit()
+        edge, _ = svc.upsert_fabric_edge(
+            self.db,
+            a_node_id=fab.id,
+            b_node_id=peer.id,
+            a_port="Eth1",
+            b_port="Eth2",
+            source="lldp",
+        )
+        self.db.commit()
+        edge_id = str(edge.id)
+        fab_id = str(fab.id)
+
+        out = detach_fabric_from_ume(self.db, [ume_id])
+        self.db.commit()
+        self.db.expire_all()
+        self.assertEqual(out["purged_orphans"], 1)
+        self.assertGreaterEqual(out["edges_deleted"], 1)
+        self.assertIsNone(self.db.get(TopoFabricNode, fab_id))
+        self.assertIsNone(self.db.get(TopoFabricEdge, edge_id))
+        self.assertIsNotNone(self.db.get(TopoFabricNode, peer.id))
+
+    def test_fabric_reconcile_scheduler_once_sweeps_orphans(self) -> None:
+        from netx_api.fabric_reconcile_scheduler import run_fabric_reconcile_once
+
+        suffix = uuid4().hex[:8]
+        orphan_id = f"gc-{suffix}"
+        orphan = TopoFabricNode(
+            id=orphan_id,
+            name=f"GC-{suffix}",
+            ip="10.69.0.1",
+        )
+        self.db.add(orphan)
+        self.db.commit()
+
+        stats = run_fabric_reconcile_once()
+        self.assertGreaterEqual(int(stats.get("purged_orphans") or 0), 1)
+        self.db.expire_all()
+        self.assertIsNone(self.db.get(TopoFabricNode, orphan_id))
 
     def test_delete_fabric_node_only_orphans_and_placeholders(self) -> None:
         from fastapi import HTTPException
@@ -1659,6 +1769,59 @@ Management Addresses:
         self.assertIsNotNone(self.db.get(ManagedNE, real.id))
         self.assertIsNotNone(self.db.get(ManagedNE, ph.id))
 
+    def test_purge_placeholder_deletes_managed_and_edges(self) -> None:
+        from fastapi import HTTPException
+
+        from netx_api.topology_inventory_lifecycle import purge_placeholder_fabric_nodes
+
+        suffix = uuid4().hex[:8]
+        topo_ph = ManagedNE(
+            id=f"topo-{suffix}",
+            name=f"TOPO-{suffix}",
+            vendor="Other",
+            device_type="generic",
+            ip_address="",
+            source=TOPOLOGY_NE_SOURCE,
+        )
+        real = ManagedNE(
+            id=f"real2-{suffix}",
+            name=f"REAL2-{suffix}",
+            vendor="Cisco",
+            device_type="cisco_ios",
+            ip_address=f"10.78.{(int(suffix[:2], 16) % 200) + 1}.1",
+            source="",
+        )
+        self.db.add(topo_ph)
+        self.db.add(real)
+        self.db.commit()
+        fab_ph = svc.ensure_fabric_node_for_managed(self.db, topo_ph)
+        fab_real = svc.ensure_fabric_node_for_managed(self.db, real)
+        edge, _ = svc.upsert_fabric_edge(
+            self.db,
+            a_node_id=fab_ph.id,
+            b_node_id=fab_real.id,
+            a_port="Gi0/1",
+            b_port="Gi0/2",
+            source="manual",
+        )
+        self.db.commit()
+        edge_id = str(edge.id)
+
+        with self.assertRaises(HTTPException) as ctx:
+            purge_placeholder_fabric_nodes(self.db, [fab_real.id])
+        self.assertEqual(ctx.exception.status_code, 400)
+
+        out = purge_placeholder_fabric_nodes(self.db, [fab_ph.id])
+        self.assertEqual(out["deleted"], 1)
+        self.assertEqual(out["managed_deleted"], 1)
+        self.assertGreaterEqual(out["edges_deleted"], 1)
+        self.db.expire_all()
+        self.assertIsNone(self.db.get(TopoFabricNode, fab_ph.id))
+        self.assertIsNone(self.db.get(ManagedNE, topo_ph.id))
+        self.assertIsNone(self.db.get(TopoFabricEdge, edge_id))
+        self.assertIsNotNone(self.db.get(TopoFabricNode, fab_real.id))
+        self.assertIsNotNone(self.db.get(ManagedNE, real.id))
+
     def test_filter_bulk_add_layout_and_remove(self) -> None:
         from netx_api.topology_schemas import ViewMutationOut, ViewNodesRemove
 

web/WEB.md

@@ -126,7 +126,8 @@ src/
 ## 拓扑管理（Fabric + 站点目录，对齐厂商）
 
 - 三层库存：**运维** `managed_ne`（凭据/采集/WebCRT）· **EMS** `ume_inventory_ne` · **拓扑投影** `topo_fabric_node`（上图/LLDP/分类）。Fabric 由 ensure 按需创建，与运维表不是同一张表。
-- 删除运维网元：解绑 `fabric.managed_ne_id`（及 view membership），**不删**上图点/边；UME 库存 reconcile 对称解绑 `ume_ne_id`。历史悬空引用：`POST /fabric/reconcile-links`（亦并入 `cleanup-duplicates`）。
+- 删除运维网元（手工 / WebCRT / `ume_sync` ManagedNE 同一路径）：先解绑 `fabric.managed_ne_id`（及 view membership）。若该 Fabric 节点同时仍绑 UME → 变为 UME-only，**保留**节点与直连边；若解绑后已无 managed 且无 UME（完全孤儿）→ **硬删** Fabric 节点并级联直连边 / placements。UME 库存 reconcile 对称解绑 `ume_ne_id`，同样在完全孤儿时 purge。历史悬空引用与孤儿 GC：`POST /fabric/reconcile-links`（`cleanup-duplicates` 先 merge/absorb 再扫孤儿）；后台默认每 6h 跑一次（`fabric_reconcile_scheduler_*`，可关）。
+- 画布：移出本图仅影响 placement（保存落库）；删边本地排队、**保存**才删 Fabric（Undo 仅保存前有效）；topology/lldp 占位可右键硬删（ManagedNE+Fabric+边）。未匹配且未建占位的对端不上 Fabric 边。
 - 事实库：`topo_fabric_node` / `topo_fabric_edge`（按 5 万网元 / 100 万链路设计；物理层仅 LLDP）
 - 站点树：`topo_folder`（系统隐藏 `root`；用户新建站点/区域，无默认「未分区」）
 - 拓扑图：`topo_view.kind=physical|custom`（同站点下平级；建区域后需手工/MCP 建画布）+ `topo_view_node`

web/src/i18n/en.ts

@@ -718,10 +718,12 @@ const en = {
     edit: "Edit",
     delete: "Delete",
     openTerminal: "Terminal",
-    confirmDelete: "Delete this network element?",
+    confirmDelete:
+      "Delete this network element? If its Fabric node is managed-only (no UME binding), that node and its direct links will also be removed.",
     batchDelete: "Batch delete",
     batchDeleting: "Deleting…",
-    batchDeleteConfirm: "Delete {{n}} selected network element(s)? This cannot be undone.",
+    batchDeleteConfirm:
+      "Delete {{n}} selected network element(s)? Cannot be undone. Managed-only Fabric nodes cascade (node + direct links); nodes still bound to UME keep topology.",
     batchDeleteDone: "Deleted {{n}} network element(s)",
     batchDeleteSelectRequired: "Select network elements to delete",
     keywordPh: "name / IP / user / tags",
@@ -784,7 +786,8 @@ const en = {
       syncing: "Syncing…",
       delete: "Delete UME NEs",
       deleting: "Deleting…",
-      deleteConfirm: "Delete all managed NEs created from UME sync? This cannot be undone.",
+      deleteConfirm:
+        "Delete all managed NEs created from UME sync? Cannot be undone. Fabric nodes that become fully orphaned (no UME left) are removed with their direct links.",
       done: "UME sync done: {{inserted}} inserted, {{updated}} updated, {{deleted}} deleted, {{total}} inventory total",
       deletedDone: "Deleted {{n}} UME-synced NEs",
     },
@@ -1409,8 +1412,8 @@ const en = {
     projectedNeighbors: "Projected {{count}} neighbor(s) onto the map",
     localBrowserOnly: "this browser only",
     deleteEdgeConfirm:
-      "Delete selected link(s)? This removes them from Fabric globally; LLDP may recreate them on the next collect.",
+      "Remove selected link(s) from the canvas? They are deleted from Fabric only when you Save. LLDP may recreate them on the next collect.",
-    edgeDeleted: "Deleted {{count}} link(s)",
+    edgeDeleted: "Queued {{count}} link delete(s) — Save to apply",
     discoverCancelled: "Discovery cancelled",
     truncatedMembership: "Membership cap reached; some neighbors were not placed. Use classify/slices or a new map.",
     truncatedFrozen: "This map membership is frozen; neighbors cannot be projected. Unfreeze in classify/slices or create a new map.",
@@ -1418,8 +1421,8 @@ const en = {
     truncatedEdges: "Too many edges; display truncated. Filter status or create another map.",
     truncatedGeneric: "Graph data truncated. Narrow scope or create another map.",
     deleteSelectionConfirm:
-      "Remove {{nodes}} NE(s) from this map and delete {{edges}} Fabric link(s)?",
+      "Remove {{nodes}} NE(s) from this map and {{edges}} link(s)? Link deletes apply on Save; NE remove from map applies on Save.",
-    selectionDeleted: "Removed {{nodes}} NE(s) and deleted {{edges}} link(s)",
+    selectionDeleted: "Queued: remove {{nodes}} NE(s), delete {{edges}} link(s) — Save to apply",
     newMap: "New",
     newMapName: "New topology",
     rename: "Rename",
@@ -1498,6 +1501,10 @@ const en = {
     openWebcrt: "Open terminal",
     openNe: "NE details",
     removeNode: "Remove from canvas",
+    deletePlaceholder: "Delete placeholder",
+    deletePlaceholderConfirm:
+      "Permanently delete this placeholder NE (inventory + Fabric links)? This cannot be undone with canvas Undo.",
+    deletePlaceholderDone: "Placeholder deleted",
     removeEdge: "Delete edge",
     nodeMenu: "Node",
     paneMenu: "Canvas",
@@ -1610,8 +1617,9 @@ const en = {
     locateOnCanvas: "Click to locate on canvas",
     openPortTraffic: "Open port traffic",
     removeStale: "Clear missing ({{count}})",
-    removeStaleHint: "Manually delete red missing edges; scheduled collect also purges after 4 consecutive misses",
+    removeStaleHint:
-    staleRemoved: "Removed {{count}} missing edge(s)",
+      "Queue delete of red missing edges (applies on Save); scheduled collect also purges after 4 consecutive misses",
+    staleRemoved: "Queued {{count}} missing edge delete(s) — Save to apply",
     connectHint: "Connect mode: click source node, then target (Esc or Select to exit)",
   },
   topoClassify: {

web/src/i18n/zh.ts

@@ -712,10 +712,12 @@ const zh = {
     edit: "编辑",
     delete: "删除",
     openTerminal: "终端",
-    confirmDelete: "确定删除该网元？",
+    confirmDelete:
+      "确定删除该网元？若拓扑中仅绑定此运维网元（无 UME），将同时删除对应 Fabric 节点及其直连链路。",
     batchDelete: "批量删除",
     batchDeleting: "删除中…",
-    batchDeleteConfirm: "确定删除选中的 {{n}} 台网元？此操作不可恢复。",
+    batchDeleteConfirm:
+      "确定删除选中的 {{n}} 台网元？不可恢复。仅绑定运维侧的节点会级联清除 Fabric 节点与直连链路；仍绑 UME 的会保留拓扑。",
     batchDeleteDone: "已删除 {{n}} 台网元",
     batchDeleteSelectRequired: "请先勾选要删除的网元",
     keywordPh: "名称 / IP / 用户名 / 标签",
@@ -777,7 +779,8 @@ const zh = {
       syncing: "同步中…",
       delete: "删除 UME 网元",
       deleting: "删除中…",
-      deleteConfirm: "确定删除所有通过 UME 同步到网元管理中的网元？此操作不可恢复。",
+      deleteConfirm:
+        "确定删除所有通过 UME 同步到网元管理中的网元？不可恢复。仅绑定这些 ManagedNE、且无 UME 投影的 Fabric 节点会连同直连链路一并清除。",
       done: "UME 同步完成：新增 {{inserted}}，更新 {{updated}}，删除 {{deleted}}，UME 清单共 {{total}} 台",
       deletedDone: "已删除 {{n}} 台 UME 同步网元",
     },
@@ -1400,16 +1403,17 @@ const zh = {
     projectNeighbors: "投影邻居上图",
     projectedNeighbors: "已投影 {{count}} 个邻居上图",
     localBrowserOnly: "仅本浏览器",
-    deleteEdgeConfirm: "删除选中链路？将从 Fabric 全局移除；LLDP 下次采集若仍存在可能再次出现。",
+    deleteEdgeConfirm: "从画布移除选中链路？仅在点击「保存」后才会从 Fabric 删除；LLDP 下次采集若仍存在可能再次出现。",
-    edgeDeleted: "已删除 {{count}} 条链路",
+    edgeDeleted: "已标记删除 {{count}} 条链路（保存后生效）",
     discoverCancelled: "发现已取消",
     truncatedMembership: "视图已达成员上限，部分邻居未上图。可去分类/切片或新建视图。",
     truncatedFrozen: "当前视图已冻结成员，无法投影邻居。请在分类/切片中解冻或新建视图。",
     truncatedNodes: "画布节点过多已截断显示。建议新建视图或收紧成员范围。",
     truncatedEdges: "画布链路过多已截断显示。建议筛选状态或新建视图。",
     truncatedGeneric: "图数据已截断显示。建议收紧范围或新建视图。",
-    deleteSelectionConfirm: "删除选中的 {{nodes}} 个网元（移出画布）和 {{edges}} 条链路（从 Fabric 删除）？",
+    deleteSelectionConfirm:
-    selectionDeleted: "已移除 {{nodes}} 个网元、删除 {{edges}} 条链路",
+      "从本图移除 {{nodes}} 个网元、删除 {{edges}} 条链路？移出与链路删除均在点击「保存」后生效。",
+    selectionDeleted: "已标记：移除 {{nodes}} 个网元、删除 {{edges}} 条链路（保存后生效）",
     newMap: "新建",
     newMapName: "新拓扑图",
     rename: "重命名",
@@ -1488,6 +1492,9 @@ const zh = {
     openWebcrt: "打开终端",
     openNe: "网元详情",
     removeNode: "从画布移除",
+    deletePlaceholder: "删除占位网元",
+    deletePlaceholderConfirm: "永久删除此占位网元（含库存记录与 Fabric 直连链路）？画布撤销无法恢复。",
+    deletePlaceholderDone: "占位网元已删除",
     removeEdge: "删除链路",
     nodeMenu: "网元",
     paneMenu: "画布",
@@ -1598,8 +1605,8 @@ const zh = {
     locateOnCanvas: "点击定位到画布",
     openPortTraffic: "打开端口流量",
     removeStale: "清除未发现 ({{count}})",
-    removeStaleHint: "手动删除红色未发现链路；周期采集连续 4 次未发现也会自动清理",
+    removeStaleHint: "标记删除红色未发现链路（保存后生效）；周期采集连续 4 次未发现也会自动清理",
-    staleRemoved: "已删除 {{count}} 条未发现链路",
+    staleRemoved: "已标记删除 {{count}} 条未发现链路（保存后生效）",
     connectHint: "连线模式：依次点击源节点 → 目标节点（Esc 或切回选择退出）",
   },
   topoClassify: {

web/src/pages/TopologyPage.tsx

@@ -39,6 +39,7 @@ import {
   createTopologyPlaceholder,
   createTopologyView,
   deleteFabricEdges,
+  purgePlaceholderFabricNodes,
   deleteTopologyFolder,
   deleteTopologyMap,
   fetchLldpCollectDashboard,
@@ -278,7 +279,11 @@ type NeNodeData = {
   node_count?: number;
 };
 
-type HistorySnap = { nodes: Node<NeNodeData>[]; edges: Edge[] };
+type HistorySnap = {
+  nodes: Node<NeNodeData>[];
+  edges: Edge[];
+  pendingEdgeDeletes: string[];
+};
 
 type PaletteSource = "managed" | "ume";
 
@@ -921,6 +926,8 @@ export function TopologyPage() {
   const historyRef = useRef<HistorySnap[]>([]);
   const redoRef = useRef<HistorySnap[]>([]);
   const historyLockRef = useRef(false);
+  /** Fabric edge ids removed locally; flushed on Save (not when only removing nodes from view). */
+  const pendingEdgeDeletesRef = useRef<Set<string>>(new Set());
   const connectClickRef = useRef<string | null>(null);
   const canUndo = historyTick >= 0 && historyRef.current.length > 0;
   const canRedo = historyTick >= 0 && redoRef.current.length > 0;
@@ -1259,6 +1266,7 @@ export function TopologyPage() {
       appliedMapIdRef.current = mapId;
       historyRef.current = [];
       redoRef.current = [];
+      pendingEdgeDeletesRef.current = new Set();
       clearDirty();
       bumpHistory();
       needsInitialFitRef.current = true;
@@ -1299,6 +1307,7 @@ export function TopologyPage() {
       {
         nodes: nodes.map((n) => ({ ...n, position: { ...n.position }, data: { ...n.data } })),
         edges: edges.map((e) => ({ ...e })),
+        pendingEdgeDeletes: [...pendingEdgeDeletesRef.current],
       },
     ];
     redoRef.current = [];
@@ -1311,10 +1320,12 @@ export function TopologyPage() {
     redoRef.current.push({
       nodes: nodes.map((n) => ({ ...n, position: { ...n.position }, data: { ...n.data } })),
       edges: edges.map((e) => ({ ...e })),
+      pendingEdgeDeletes: [...pendingEdgeDeletesRef.current],
     });
     historyLockRef.current = true;
     setNodes(prev.nodes);
     setEdges(prev.edges);
+    pendingEdgeDeletesRef.current = new Set(prev.pendingEdgeDeletes);
     markDirty();
     bumpHistory();
     historyLockRef.current = false;
@@ -1326,10 +1337,12 @@ export function TopologyPage() {
     historyRef.current.push({
       nodes: nodes.map((n) => ({ ...n, position: { ...n.position }, data: { ...n.data } })),
       edges: edges.map((e) => ({ ...e })),
+      pendingEdgeDeletes: [...pendingEdgeDeletesRef.current],
     });
     historyLockRef.current = true;
     setNodes(next.nodes);
     setEdges(next.edges);
+    pendingEdgeDeletesRef.current = new Set(next.pendingEdgeDeletes);
     markDirty();
     bumpHistory();
     historyLockRef.current = false;
@@ -1353,7 +1366,9 @@ export function TopologyPage() {
       if (opts?.persist && mapId) {
         try {
           const graph = await patchTopologyPositions(mapId, flowToPositions(next));
+          if (pendingEdgeDeletesRef.current.size === 0) {
             clearDirty();
+          }
           queryClient.setQueryData(queryKeys.topologyGraph(mapId), graph);
         } catch (err) {
           showError(String(err));
@@ -1501,6 +1516,11 @@ export function TopologyPage() {
   const saveMut = useMutation({
     mutationFn: async () => {
       if (!mapId) throw new Error(t("topology.selectMap"));
+      const pendingEdges = [...pendingEdgeDeletesRef.current];
+      if (pendingEdges.length) {
+        await deleteFabricEdges(pendingEdges);
+        pendingEdgeDeletesRef.current.clear();
+      }
       // Positions patch only updates listed nodes; sync canvas removals first.
       const serverIds = (graphQuery.data?.nodes || [])
         .map((n) => n.fabric_node_id)
@@ -1553,6 +1573,19 @@ export function TopologyPage() {
       });
       try {
         if (dirtyRef.current) {
+          const pendingEdges = [...pendingEdgeDeletesRef.current];
+          if (pendingEdges.length) {
+            await deleteFabricEdges(pendingEdges);
+            pendingEdgeDeletesRef.current.clear();
+          }
+          const serverIds = (graphQuery.data?.nodes || [])
+            .map((n) => n.fabric_node_id)
+            .filter(Boolean);
+          const localIds = new Set(nodes.map((n) => n.id));
+          const toRemove = serverIds.filter((id) => !localIds.has(id));
+          if (toRemove.length) {
+            await removeTopologyViewNodes(mapId, toRemove);
+          }
           await patchTopologyPositions(mapId, flowToPositions(nodes));
           clearDirty();
         }
@@ -1697,7 +1730,7 @@ export function TopologyPage() {
         setDiscovering(false);
       }
     },
-    [mapId, discovering, nodes, queryClient, setNodes, setEdges, showOk, showError, t, autoLayoutAfterDiscover, discoverAutoAddUnmatched, discoverProjectNeighbors, edgeDefaults, clearDirty, markDirty, scheduleFitView],
+    [mapId, discovering, nodes, queryClient, setNodes, setEdges, showOk, showError, t, autoLayoutAfterDiscover, discoverAutoAddUnmatched, discoverProjectNeighbors, edgeDefaults, clearDirty, markDirty, scheduleFitView, graphQuery.data],
   );
 
   const cancelDiscover = useCallback(async () => {
@@ -1777,6 +1810,7 @@ export function TopologyPage() {
           historyLockRef.current = true;
           applyViewGraph(graph, edgeDefaults, setNodes, setEdges);
           historyLockRef.current = false;
+          pendingEdgeDeletesRef.current = new Set();
           clearDirty();
         } catch (err) {
           showError(String(err));
@@ -2029,41 +2063,31 @@ export function TopologyPage() {
     setEdges((es) => es.map((e) => ({ ...e, selected: false })));
   }, [setNodes, setEdges]);
 
-  const persistDeleteEdges = useCallback(
+  const queueDeleteEdges = useCallback(
-    async (
+    (
       edgeIds: string[],
       opts?: { confirmKey?: string; okKey?: string; skipConfirm?: boolean },
     ) => {
-      if (!mapId || !edgeIds.length) return false;
+      if (!edgeIds.length) return false;
       if (!opts?.skipConfirm) {
         const confirmMsg = t(opts?.confirmKey || "topology.deleteEdgeConfirm");
         if (!window.confirm(confirmMsg)) return false;
       }
       pushHistory();
-      try {
+      for (const id of edgeIds) pendingEdgeDeletesRef.current.add(id);
-        await deleteFabricEdges(edgeIds);
+      const idSet = new Set(edgeIds);
-        const graph = await fetchTopologyGraph(mapId);
+      setEdges((es) => es.filter((e) => !idSet.has(e.id)));
-        queryClient.setQueryData(queryKeys.topologyGraph(mapId), graph);
+      setSelectedEdgeId((cur) => (cur && idSet.has(cur) ? null : cur));
-        appliedMapIdRef.current = mapId;
+      markDirty();
-        const localPos = new Map(nodes.map((n) => [n.id, n.position]));
-        historyLockRef.current = true;
-        applyViewGraph(graph, edgeDefaults, setNodes, setEdges, localPos);
-        historyLockRef.current = false;
-        clearDirty();
-        setSelectedEdgeId((cur) => (cur && edgeIds.includes(cur) ? null : cur));
       showOk(
         t(opts?.okKey || "topology.edgeDeleted").replace("{{count}}", String(edgeIds.length)),
       );
       return true;
-      } catch (err) {
-        showError(String(err));
-        return false;
-      }
     },
-    [mapId, nodes, setNodes, setEdges, pushHistory, queryClient, edgeDefaults, clearDirty, showOk, showError, t],
+    [pushHistory, setEdges, markDirty, showOk, t],
   );
 
-  const removeSelected = useCallback(async () => {
+  const removeSelected = useCallback(() => {
     if (!mapId) return;
     const nodeIds = nodes.filter((n) => n.selected).map((n) => n.id);
     const selectedDisplay = displayEdges.filter((e) => e.selected);
@@ -2082,55 +2106,37 @@ export function TopologyPage() {
         .replace("{{edges}}", String(edgeIds.size));
       if (!window.confirm(msg)) return;
       pushHistory();
-      try {
+      const nodeSet = new Set(nodeIds);
-        if (dirtyRef.current) {
+      for (const id of edgeIds) pendingEdgeDeletesRef.current.add(id);
-          await patchTopologyPositions(mapId, flowToPositions(nodes));
+      setNodes((ns) => ns.filter((n) => !nodeSet.has(n.id)));
-          clearDirty();
+      setEdges((es) =>
-        }
+        es.filter(
-        await deleteFabricEdges([...edgeIds]);
+          (e) =>
-        const localPos = new Map(nodes.map((n) => [n.id, n.position]));
+            !edgeIds.has(e.id) && !nodeSet.has(e.source) && !nodeSet.has(e.target),
-        const graph = await removeTopologyViewNodes(mapId, nodeIds);
+        ),
-        queryClient.setQueryData(queryKeys.topologyGraph(mapId), graph);
+      );
-        appliedMapIdRef.current = mapId;
-        historyLockRef.current = true;
-        applyViewGraph(graph, edgeDefaults, setNodes, setEdges, localPos);
-        historyLockRef.current = false;
-        clearDirty();
       setSelectedEdgeId(null);
+      markDirty();
       showOk(
         t("topology.selectionDeleted")
           .replace("{{nodes}}", String(nodeIds.length))
           .replace("{{edges}}", String(edgeIds.size)),
       );
-      } catch (err) {
-        showError(String(err));
-      }
       return;
     }
 
     if (!nodeIds.length && edgeIds.size) {
-      await persistDeleteEdges([...edgeIds]);
+      queueDeleteEdges([...edgeIds]);
       return;
     }
 
     pushHistory();
-    try {
+    const nodeSet = new Set(nodeIds);
-      if (dirtyRef.current) {
+    setNodes((ns) => ns.filter((n) => !nodeSet.has(n.id)));
-        await patchTopologyPositions(mapId, flowToPositions(nodes));
+    // Drop incident edges from the canvas only — do not queue Fabric deletes.
-        clearDirty();
+    setEdges((es) => es.filter((e) => !nodeSet.has(e.source) && !nodeSet.has(e.target)));
-      }
-      const localPos = new Map(nodes.map((n) => [n.id, n.position]));
-      const graph = await removeTopologyViewNodes(mapId, nodeIds);
-      queryClient.setQueryData(queryKeys.topologyGraph(mapId), graph);
-      appliedMapIdRef.current = mapId;
-      historyLockRef.current = true;
-      applyViewGraph(graph, edgeDefaults, setNodes, setEdges, localPos);
-      historyLockRef.current = false;
-      clearDirty();
     setSelectedEdgeId(null);
-    } catch (err) {
+    markDirty();
-      showError(String(err));
-    }
   }, [
     mapId,
     nodes,
@@ -2139,12 +2145,9 @@ export function TopologyPage() {
     setNodes,
     setEdges,
     pushHistory,
-    queryClient,
+    markDirty,
-    edgeDefaults,
-    clearDirty,
-    showError,
     showOk,
-    persistDeleteEdges,
+    queueDeleteEdges,
     t,
   ]);
 
@@ -2152,7 +2155,7 @@ export function TopologyPage() {
     const display = displayEdges.find((e) => e.id === edgeId);
     const ids = physicalIdsForDisplayEdge(display, edges);
     const list = ids.length ? ids : [edgeId];
-    void persistDeleteEdges(list);
+    queueDeleteEdges(list);
     closeCtxMenu();
   };
 
@@ -2165,13 +2168,13 @@ export function TopologyPage() {
       .map((e) => e.id);
   }, [edges]);
 
-  const removeStaleEdges = useCallback(async () => {
+  const removeStaleEdges = useCallback(() => {
     if (!staleEdgeIds.length) return;
-    await persistDeleteEdges(staleEdgeIds, {
+    queueDeleteEdges(staleEdgeIds, {
       confirmKey: "topology.removeStaleHint",
       okKey: "topology.staleRemoved",
     });
-  }, [staleEdgeIds, persistDeleteEdges]);
+  }, [staleEdgeIds, queueDeleteEdges]);
 
   const projectOutsidePeers = useCallback(async () => {
     if (!mapId) return;
@@ -2281,27 +2284,80 @@ export function TopologyPage() {
     };
   }, [ctxMenu, closeCtxMenu]);
 
-  const removeNodeById = async (nodeId: string) => {
+  const removeNodeById = (nodeId: string) => {
     if (!mapId) return;
     pushHistory();
     closeCtxMenu();
+    setNodes((ns) => ns.filter((n) => n.id !== nodeId));
+    setEdges((es) => es.filter((e) => e.source !== nodeId && e.target !== nodeId));
+    markDirty();
+  };
+
+  const purgePlaceholderById = useCallback(
+    async (nodeId: string) => {
+      if (!mapId) return;
+      const node = nodes.find((n) => n.id === nodeId);
+      if (!node || !isPlaceholderSource(node.data.managed_source, node.data.ne_ip)) {
+        return;
+      }
+      if (!window.confirm(t("topology.deletePlaceholderConfirm"))) return;
+      closeCtxMenu();
       try {
         if (dirtyRef.current) {
-        await patchTopologyPositions(mapId, flowToPositions(nodes));
+          const pendingEdges = [...pendingEdgeDeletesRef.current];
-        clearDirty();
+          if (pendingEdges.length) {
+            await deleteFabricEdges(pendingEdges);
+            pendingEdgeDeletesRef.current.clear();
           }
-      const localPos = new Map(nodes.map((n) => [n.id, n.position]));
+          const serverIds = (graphQuery.data?.nodes || [])
-      const graph = await removeTopologyViewNodes(mapId, [nodeId]);
+            .map((n) => n.fabric_node_id)
+            .filter(Boolean);
+          const localIds = new Set(nodes.map((n) => n.id));
+          const toRemove = serverIds.filter((id) => !localIds.has(id) && id !== nodeId);
+          if (toRemove.length) {
+            await removeTopologyViewNodes(mapId, toRemove);
+          }
+          await patchTopologyPositions(
+            mapId,
+            flowToPositions(nodes.filter((n) => n.id !== nodeId)),
+          );
+        }
+        await purgePlaceholderFabricNodes([nodeId]);
+        const graph = await fetchTopologyGraph(mapId);
         queryClient.setQueryData(queryKeys.topologyGraph(mapId), graph);
         appliedMapIdRef.current = mapId;
+        const localPos = new Map(
+          nodes.filter((n) => n.id !== nodeId).map((n) => [n.id, n.position]),
+        );
         historyLockRef.current = true;
         applyViewGraph(graph, edgeDefaults, setNodes, setEdges, localPos);
         historyLockRef.current = false;
+        pendingEdgeDeletesRef.current = new Set();
+        historyRef.current = [];
+        redoRef.current = [];
+        bumpHistory();
         clearDirty();
+        showOk(t("topology.deletePlaceholderDone"));
       } catch (err) {
         showError(String(err));
       }
-  };
+    },
+    [
+      mapId,
+      nodes,
+      graphQuery.data,
+      closeCtxMenu,
+      queryClient,
+      edgeDefaults,
+      setNodes,
+      setEdges,
+      clearDirty,
+      bumpHistory,
+      showOk,
+      showError,
+      t,
+    ],
+  );
 
   const openNeInventory = (opts: {
     neId?: string;
@@ -4521,6 +4577,19 @@ export function TopologyPage() {
                 </button>
               </li>
               <li className="topo-ctx__sep" aria-hidden />
+              {selectedNode &&
+              isPlaceholderSource(selectedNode.data.managed_source, selectedNode.data.ne_ip) ? (
+                <li role="none">
+                  <button
+                    type="button"
+                    className="topo-ctx__item topo-ctx__item--danger"
+                    role="menuitem"
+                    onClick={() => void purgePlaceholderById(ctxMenu.id)}
+                  >
+                    {t("topology.deletePlaceholder")}
+                  </button>
+                </li>
+              ) : null}
               <li role="none">
                 <button
                   type="button"

web/src/services/api.ts

@@ -1176,6 +1176,18 @@ export const deleteFabricNodes = (fabricNodeIds: string[]) =>
     { fabric_node_ids: fabricNodeIds },
   );
 
+/** Hard-delete topology/LLDP placeholders (ManagedNE + fabric + edges). */
+export const purgePlaceholderFabricNodes = (fabricNodeIds: string[]) =>
+  apiPost<{
+    deleted: number;
+    edges_deleted: number;
+    placements_deleted: number;
+    managed_deleted: number;
+    membership_views: number;
+  }>("/v1/topology/fabric/nodes/purge-placeholders", {
+    fabric_node_ids: fabricNodeIds,
+  });
+
 export const generateTopologySlices = (body: {
   folder_id: string;
   template: "core_only" | "core_agg" | "agg_access";