feat: manage canvases with custom name and icon

Make designs (canvases) fully user-manageable: create with a chosen name
and icon, rename, change icon, and delete. Replaces the hardcoded
"New Electrical Design" button with a generic "New Canvas" flow.

- Add Design.icon column + migration that backfills legacy rows
  (electrical -> zap, others -> dashboard)
- DesignModal: name input + curated lucide icon picker (create + edit)
- Sidebar switcher gains per-canvas edit/delete; delete guards the last
  canvas and confirms
- designStore: addDesign/updateDesign/removeDesign with active reassignment
- Fix data loss on design switch: abort load when the save fails and keep
  unsaved edits; skip the save-old step when the previous canvas was deleted
- designsApi create/update carry icon; design_type kept for back-compat

Tests: backend design CRUD (icon + cascade + last-canvas guard), designStore
actions, designIcons resolver, DesignModal create/edit/validation.

ha-relevant: yes

backend/app/api/routes/canvas.py

@@ -1,13 +1,14 @@
+import uuid
 from datetime import datetime, timezone
 from typing import Any
 
-from fastapi import APIRouter, Depends
+from fastapi import APIRouter, Depends, Query
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.api.deps import get_current_user
 from app.db.database import get_db
-from app.db.models import CanvasState, Edge, Node
+from app.db.models import CanvasState, Design, Edge, Node
 from app.schemas.canvas import CanvasSaveRequest, CanvasStateResponse
 from app.schemas.edges import EdgeResponse
 from app.schemas.nodes import NodeResponse
@@ -16,10 +17,20 @@ router = APIRouter()
 
 
 @router.get("", response_model=CanvasStateResponse)
-async def load_canvas(db: AsyncSession = Depends(get_db), _: str = Depends(get_current_user)) -> CanvasStateResponse:
+async def load_canvas(
-    nodes = (await db.execute(select(Node))).scalars().all()
+    design_id: str | None = Query(None, description="Design ID to load; uses first design if omitted"),
-    edges = (await db.execute(select(Edge))).scalars().all()
+    db: AsyncSession = Depends(get_db),
-    state = await db.get(CanvasState, 1)
+    _: str = Depends(get_current_user),
+) -> CanvasStateResponse:
+    if design_id is None:
+        first = (await db.execute(select(Design).order_by(Design.created_at).limit(1))).scalar()
+        design_id = first.id if first else None
+    if design_id is None:
+        return CanvasStateResponse(nodes=[], edges=[], viewport={"x": 0, "y": 0, "zoom": 1}, custom_style=None)
+
+    nodes = (await db.execute(select(Node).where(Node.design_id == design_id))).scalars().all()
+    edges = (await db.execute(select(Edge).where(Edge.design_id == design_id))).scalars().all()
+    state = await db.get(CanvasState, design_id)
     viewport: dict[str, Any] = state.viewport if state else {"x": 0, "y": 0, "zoom": 1}
     return CanvasStateResponse(
         nodes=[NodeResponse.model_validate(n) for n in nodes],
@@ -32,18 +43,28 @@ async def load_canvas(db: AsyncSession = Depends(get_db), _: str = Depends(get_c
 @router.post("/save")
 async def save_canvas(
     body: CanvasSaveRequest, db: AsyncSession = Depends(get_db), _: str = Depends(get_current_user)
-) -> dict[str, bool]:
+) -> dict[str, bool | str]:
+    design_id = body.design_id
+    if design_id is None:
+        first = (await db.execute(select(Design).order_by(Design.created_at).limit(1))).scalar()
+        design_id = first.id if first else None
+    if design_id is None:
+        new_design = Design(id=str(uuid.uuid4()), name="Network Topology", design_type="network")
+        db.add(new_design)
+        await db.flush()
+        design_id = new_design.id
+
     incoming_node_ids = {n.id for n in body.nodes}
     incoming_edge_ids = {e.id for e in body.edges}
 
-    # Delete nodes removed from canvas
+    # Delete nodes removed from canvas (only within this design)
-    existing_nodes = (await db.execute(select(Node))).scalars().all()
+    existing_nodes = (await db.execute(select(Node).where(Node.design_id == design_id))).scalars().all()
     for node in existing_nodes:
         if node.id not in incoming_node_ids:
             await db.delete(node)
 
-    # Delete edges removed from canvas
+    # Delete edges removed from canvas (only within this design)
-    existing_edges = (await db.execute(select(Edge))).scalars().all()
+    existing_edges = (await db.execute(select(Edge).where(Edge.design_id == design_id))).scalars().all()
     for edge in existing_edges:
         if edge.id not in incoming_edge_ids:
             await db.delete(edge)
@@ -53,29 +74,33 @@ async def save_canvas(
     # Upsert nodes
     for node_data in body.nodes:
         db_node = await db.get(Node, node_data.id)
+        payload = node_data.model_dump()
+        payload["design_id"] = design_id
         if db_node:
-            for field, value in node_data.model_dump().items():
+            for field, value in payload.items():
                 setattr(db_node, field, value)
         else:
-            db.add(Node(**node_data.model_dump()))
+            db.add(Node(**payload))
 
     # Upsert edges
     for edge_data in body.edges:
         db_edge = await db.get(Edge, edge_data.id)
+        payload = edge_data.model_dump()
+        payload["design_id"] = design_id
         if db_edge:
-            for field, value in edge_data.model_dump().items():
+            for field, value in payload.items():
                 setattr(db_edge, field, value)
         else:
-            db.add(Edge(**edge_data.model_dump()))
+            db.add(Edge(**payload))
 
     # Upsert viewport + custom style
-    state = await db.get(CanvasState, 1)
+    state = await db.get(CanvasState, design_id)
     if state:
         state.viewport = body.viewport
         state.custom_style = body.custom_style
         state.saved_at = datetime.now(timezone.utc)
     else:
-        db.add(CanvasState(id=1, viewport=body.viewport, custom_style=body.custom_style))
+        db.add(CanvasState(design_id=design_id, viewport=body.viewport, custom_style=body.custom_style))
 
     await db.commit()
     return {"saved": True}

backend/app/api/routes/designs.py

@@ -0,0 +1,81 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.api.deps import get_current_user
+from app.db.database import get_db
+from app.db.models import CanvasState, Design, Edge, Node
+from app.schemas.designs import DesignCreate, DesignResponse, DesignUpdate
+
+router = APIRouter()
+
+
+@router.get("", response_model=list[DesignResponse])
+async def list_designs(
+    db: AsyncSession = Depends(get_db),
+    _: str = Depends(get_current_user),
+) -> list[DesignResponse]:
+    designs = (await db.execute(select(Design).order_by(Design.created_at))).scalars().all()
+    return [DesignResponse.model_validate(d) for d in designs]
+
+
+@router.post("", response_model=DesignResponse, status_code=201)
+async def create_design(
+    body: DesignCreate,
+    db: AsyncSession = Depends(get_db),
+    _: str = Depends(get_current_user),
+) -> DesignResponse:
+    design = Design(name=body.name, design_type=body.design_type, icon=body.icon)
+    db.add(design)
+    await db.flush()
+    # Create empty canvas state for the new design
+    db.add(CanvasState(design_id=design.id))
+    await db.commit()
+    await db.refresh(design)
+    return DesignResponse.model_validate(design)
+
+
+@router.put("/{design_id}", response_model=DesignResponse)
+async def update_design(
+    design_id: str,
+    body: DesignUpdate,
+    db: AsyncSession = Depends(get_db),
+    _: str = Depends(get_current_user),
+) -> DesignResponse:
+    design = await db.get(Design, design_id)
+    if not design:
+        raise HTTPException(404, "Design not found")
+    if body.name is not None:
+        design.name = body.name
+    if body.icon is not None:
+        design.icon = body.icon
+    await db.commit()
+    await db.refresh(design)
+    return DesignResponse.model_validate(design)
+
+
+@router.delete("/{design_id}", status_code=204)
+async def delete_design(
+    design_id: str,
+    db: AsyncSession = Depends(get_db),
+    _: str = Depends(get_current_user),
+) -> None:
+    design = await db.get(Design, design_id)
+    if not design:
+        raise HTTPException(404, "Design not found")
+    # Count remaining designs — prevent deleting the last one
+    count = (await db.execute(select(Design))).scalars().all()
+    if len(count) <= 1:
+        raise HTTPException(400, "Cannot delete the only design")
+    # Delete associated canvas state, edges, nodes
+    cs = await db.get(CanvasState, design_id)
+    if cs:
+        await db.delete(cs)
+    edges = (await db.execute(select(Edge).where(Edge.design_id == design_id))).scalars().all()
+    for e in edges:
+        await db.delete(e)
+    nodes = (await db.execute(select(Node).where(Node.design_id == design_id))).scalars().all()
+    for n in nodes:
+        await db.delete(n)
+    await db.delete(design)
+    await db.commit()

backend/app/api/routes/liveview.py

@@ -7,7 +7,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.config import settings
 from app.db.database import get_db
-from app.db.models import CanvasState, Edge, Node
+from app.db.models import CanvasState, Design, Edge, Node
 from app.schemas.canvas import CanvasStateResponse
 from app.schemas.edges import EdgeResponse
 from app.schemas.nodes import NodeResponse
@@ -18,6 +18,7 @@ router = APIRouter()
 @router.get("", response_model=CanvasStateResponse)
 async def liveview_canvas(
     key: str | None = Query(default=None),
+    design_id: str | None = Query(default=None, description="Design to show; uses first if omitted"),
     db: AsyncSession = Depends(get_db),
 ) -> CanvasStateResponse:
     """Read-only public canvas endpoint.
@@ -30,9 +31,15 @@ async def liveview_canvas(
     if not key or not hmac.compare_digest(key, settings.liveview_key):
         raise HTTPException(status_code=403, detail="Invalid live view key")
 
-    nodes = (await db.execute(select(Node))).scalars().all()
+    if design_id is None:
-    edges = (await db.execute(select(Edge))).scalars().all()
+        first = (await db.execute(select(Design).order_by(Design.created_at).limit(1))).scalar()
-    state = await db.get(CanvasState, 1)
+        design_id = first.id if first else None
+    if design_id is None:
+        return CanvasStateResponse(nodes=[], edges=[], viewport={"x": 0, "y": 0, "zoom": 1}, custom_style=None)
+
+    nodes = (await db.execute(select(Node).where(Node.design_id == design_id))).scalars().all()
+    edges = (await db.execute(select(Edge).where(Edge.design_id == design_id))).scalars().all()
+    state = await db.get(CanvasState, design_id)
     viewport: dict[str, Any] = state.viewport if state else {"x": 0, "y": 0, "zoom": 1}
     custom_style: dict[str, Any] | None = state.custom_style if state else None
     return CanvasStateResponse(

backend/app/api/routes/scan.py

@@ -11,7 +11,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.api.deps import get_current_user
 from app.core.config import settings
 from app.db.database import AsyncSessionLocal, get_db
-from app.db.models import Edge, Node, PendingDevice, PendingDeviceLink, ScanRun
+from app.db.models import Design, Edge, Node, PendingDevice, PendingDeviceLink, ScanRun
 from app.schemas.nodes import NodeCreate
 from app.schemas.scan import PendingDeviceResponse, ScanRunResponse
 from app.services.scanner import request_cancel, run_scan
@@ -118,6 +118,10 @@ async def bulk_approve_devices(
     db: AsyncSession = Depends(get_db),
     _: str = Depends(get_current_user),
 ) -> dict[str, Any]:
+    # Determine target design (use first design as fallback)
+    first_design = (await db.execute(select(Design).order_by(Design.created_at).limit(1))).scalar()
+    default_design_id = first_design.id if first_design else None
+
     result = await db.execute(
         select(PendingDevice).where(
             PendingDevice.id.in_(payload.device_ids),
@@ -144,6 +148,7 @@ async def bulk_approve_devices(
             # Default to ping so the status checker actually polls the new node.
             # Without this the scheduler skips it (check_method NULL → no check).
             check_method="none" if is_zigbee else ("ping" if device.ip else None),
+            design_id=default_design_id,
         )
         db.add(node)
         created_nodes.append(node)
@@ -227,6 +232,12 @@ async def approve_device(
     db: AsyncSession = Depends(get_db),
     _: str = Depends(get_current_user),
 ) -> dict[str, Any]:
+    # Determine target design
+    node_design_id = node_data.design_id
+    if node_design_id is None:
+        first = (await db.execute(select(Design).order_by(Design.created_at).limit(1))).scalar()
+        node_design_id = first.id if first else None
+
     device = await db.get(PendingDevice, device_id)
     if not device:
         raise HTTPException(status_code=404, detail="Device not found")
@@ -247,6 +258,7 @@ async def approve_device(
         ) if _is_zigbee else (node_data.properties or []),
         check_method="none" if _is_zigbee else (node_data.check_method or ("ping" if node_data.ip else None)),
         check_target=None if _is_zigbee else node_data.check_target,
+        design_id=node_design_id,
     )
     db.add(node)
     await db.flush()
@@ -328,12 +340,18 @@ async def _resolve_pending_links_for_ieee(
         if (src_id, tgt_id) in existing_pairs or (tgt_id, src_id) in existing_pairs:
             await db.delete(link)
             continue
+        # Use the source node's design_id for the edge
+        edge_design_id = self_node.design_id if self_node else None
+        if edge_design_id is None:
+            first = (await db.execute(select(Design).order_by(Design.created_at).limit(1))).scalar()
+            edge_design_id = first.id if first else None
         edge = Edge(
             source=src_id,
             target=tgt_id,
             type="iot",
             source_handle="bottom",
             target_handle="top-t",
+            design_id=edge_design_id,
         )
         db.add(edge)
         await db.flush()

backend/app/api/routes/zigbee.py

@@ -11,7 +11,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.api.deps import get_current_user
 from app.db.database import AsyncSessionLocal, get_db
-from app.db.models import Node, PendingDevice, PendingDeviceLink, ScanRun
+from app.db.models import Design, Node, PendingDevice, PendingDeviceLink, ScanRun
 from app.schemas.scan import ScanRunResponse
 from app.schemas.zigbee import (
     ZigbeeCoordinatorOut,
@@ -138,6 +138,10 @@ async def _persist_pending_import(
     Coordinator auto-approves to a canvas Node. Other devices upsert by IEEE.
     All zigbee-source links are wiped and re-inserted from the new map.
     """
+    # Determine target design (use first design as fallback)
+    first_design = (await db.execute(select(Design).order_by(Design.created_at).limit(1))).scalar()
+    default_design_id = first_design.id if first_design else None
+
     coordinator_out: ZigbeeCoordinatorOut | None = None
     coordinator_existed = False
     pending_created = 0
@@ -174,6 +178,7 @@ async def _persist_pending_import(
                 ieee_address=ieee,
                 services=[],
                 properties=props,
+                design_id=default_design_id,
             )
             db.add(node)
             await db.flush()

backend/app/db/database.py

@@ -1,5 +1,7 @@
+import json as _json
 import logging
 import shutil
+import uuid as _uuid_mod
 from collections.abc import AsyncGenerator
 from contextlib import suppress
 from pathlib import Path
@@ -168,20 +170,113 @@ async def init_db() -> None:
         except OperationalError as exc:
             logger.warning("pending_devices ip-nullable rebuild failed: %s", exc)
         # --- end Zigbee schema migrations -------------------------------------
+        # --- Electrical designs schema migrations -----------------------------
+        # Create designs table (idempotent)
+        await _try_migrate(
+            conn,
+            "CREATE TABLE IF NOT EXISTS designs ("
+            "id VARCHAR PRIMARY KEY,"
+            "name VARCHAR NOT NULL,"
+            "design_type VARCHAR NOT NULL DEFAULT 'network',"
+            "created_at DATETIME,"
+            "updated_at DATETIME"
+            ")",
+            label="designs.table",
+        )
+        # Add user-chosen icon to designs (idempotent), then backfill existing rows
+        # so legacy designs keep a sensible icon based on their original type.
+        await _try_migrate(
+            conn, "ALTER TABLE designs ADD COLUMN icon VARCHAR", label="designs.icon",
+        )
+        with suppress(OperationalError):
+            await conn.exec_driver_sql(
+                "UPDATE designs SET icon = 'zap' WHERE icon IS NULL AND design_type = 'electrical'"
+            )
+        with suppress(OperationalError):
+            await conn.exec_driver_sql(
+                "UPDATE designs SET icon = 'dashboard' WHERE icon IS NULL"
+            )
+        # Seed default Network Topology design if designs table is empty
+        _default_design_id = str(_uuid_mod.uuid4())
+        row = await conn.exec_driver_sql("SELECT COUNT(*) FROM designs")
+        count_row = row.fetchone()
+        count = count_row[0] if count_row else 0
+        if count == 0:
+            await conn.exec_driver_sql(
+                "INSERT INTO designs (id, name, design_type, icon, created_at, updated_at) "
+                "VALUES (?, 'Network Topology', 'network', 'dashboard', datetime('now'), datetime('now'))",
+                (_default_design_id,),
+            )
+        else:
+            row2 = await conn.exec_driver_sql("SELECT id FROM designs WHERE design_type = 'network' LIMIT 1")
+            default = row2.fetchone()
+            _default_design_id = default[0] if default else _default_design_id
+
+        # Add design_id to nodes
+        await _try_migrate(
+            conn, "ALTER TABLE nodes ADD COLUMN design_id VARCHAR REFERENCES designs(id)",
+            label="nodes.design_id",
+        )
+        # Assign existing nodes to default design
+        await conn.exec_driver_sql(
+            "UPDATE nodes SET design_id = ? WHERE design_id IS NULL", (_default_design_id,),
+        )
+
+        # Add design_id to edges
+        await _try_migrate(
+            conn, "ALTER TABLE edges ADD COLUMN design_id VARCHAR REFERENCES designs(id)",
+            label="edges.design_id",
+        )
+        # Assign existing edges to default design
+        await conn.exec_driver_sql(
+            "UPDATE edges SET design_id = ? WHERE design_id IS NULL", (_default_design_id,),
+        )
+
+        # Migrate canvas_state from id=1 to design_id PK (SQLite rebuild)
+        try:
+            info = await conn.exec_driver_sql("PRAGMA table_info(canvas_state)")
+            cols = info.fetchall()
+            has_design_id = any(c[1] == "design_id" for c in cols)
+            if not has_design_id:
+                logger.info("Migrating canvas_state: switching to design_id primary key")
+                await conn.exec_driver_sql("PRAGMA foreign_keys = OFF")
+                await conn.exec_driver_sql(
+                    "CREATE TABLE canvas_state_new ("
+                    "design_id VARCHAR PRIMARY KEY REFERENCES designs(id) ON DELETE CASCADE,"
+                    "viewport JSON,"
+                    "custom_style JSON,"
+                    "saved_at DATETIME"
+                    ")"
+                )
+                # Copy existing row(s), mapping id=1 to default design_id
+                old_rows = await conn.exec_driver_sql("SELECT id, viewport, custom_style, saved_at FROM canvas_state")
+                for old in old_rows.fetchall():
+                    cs_id, viewport, custom_style, saved_at = old
+                    target_design = _default_design_id
+                    await conn.exec_driver_sql(
+                        "INSERT INTO canvas_state_new (design_id, viewport, custom_style, saved_at) "
+                        "VALUES (?, ?, ?, ?)",
+                        (target_design, viewport, custom_style, saved_at),
+                    )
+                await conn.exec_driver_sql("DROP TABLE canvas_state")
+                await conn.exec_driver_sql("ALTER TABLE canvas_state_new RENAME TO canvas_state")
+                await conn.exec_driver_sql("PRAGMA foreign_keys = ON")
+        except OperationalError as exc:
+            logger.warning("canvas_state migration failed: %s", exc)
+        # --- end Electrical designs schema migrations --------------------------
+
         with suppress(OperationalError):
             await conn.exec_driver_sql("ALTER TABLE edges ADD COLUMN waypoints JSON")
         with suppress(OperationalError):
             await conn.exec_driver_sql("ALTER TABLE nodes ADD COLUMN properties JSON")
-        with suppress(OperationalError):
-            await conn.exec_driver_sql("ALTER TABLE canvas_state ADD COLUMN custom_style JSON")
         # Migrate hardware columns → properties JSON (idempotent: only runs on nodes where properties IS NULL)
         with suppress(OperationalError):
             rows = await conn.exec_driver_sql(
                 "SELECT id, cpu_model, cpu_count, ram_gb, disk_gb, show_hardware "
                 "FROM nodes WHERE properties IS NULL"
             )
-            for row in rows.fetchall():
+            for r in rows.fetchall():
-                node_id, cpu_model, cpu_count, ram_gb, disk_gb, show_hardware = row
+                node_id, cpu_model, cpu_count, ram_gb, disk_gb, show_hardware = r
                 props = []
                 visible = bool(show_hardware)
                 if cpu_model:
@@ -192,7 +287,6 @@ async def init_db() -> None:
                     props.append({"key": "RAM", "value": f"{ram_gb} GB", "icon": "MemoryStick", "visible": visible})
                 if disk_gb is not None:
                     props.append({"key": "Disk", "value": f"{disk_gb} GB", "icon": "HardDrive", "visible": visible})
-                import json as _json
                 await conn.exec_driver_sql(
                     "UPDATE nodes SET properties = ? WHERE id = ?",
                     (_json.dumps(props), node_id),

backend/app/db/models.py

@@ -16,12 +16,24 @@ def _uuid() -> str:
     return str(uuid.uuid4())
 
 
+class Design(Base):
+    __tablename__ = "designs"
+
+    id: Mapped[str] = mapped_column(String, primary_key=True, default=_uuid)
+    name: Mapped[str] = mapped_column(String, nullable=False)
+    design_type: Mapped[str] = mapped_column(String, nullable=False, default="network")
+    icon: Mapped[str | None] = mapped_column(String, nullable=True, default="dashboard")
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_now)
+    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_now, onupdate=_now)
+
+
 class Node(Base):
     __tablename__ = "nodes"
 
     id: Mapped[str] = mapped_column(String, primary_key=True, default=_uuid)
     type: Mapped[str] = mapped_column(String, nullable=False)
     label: Mapped[str] = mapped_column(String, nullable=False)
+    design_id: Mapped[str | None] = mapped_column(String, ForeignKey("designs.id", ondelete="SET NULL"), nullable=True)
     hostname: Mapped[str | None] = mapped_column(String)
     ip: Mapped[str | None] = mapped_column(String)
     mac: Mapped[str | None] = mapped_column(String)
@@ -61,6 +73,7 @@ class Edge(Base):
     id: Mapped[str] = mapped_column(String, primary_key=True, default=_uuid)
     source: Mapped[str] = mapped_column(String, ForeignKey("nodes.id", ondelete="CASCADE"))
     target: Mapped[str] = mapped_column(String, ForeignKey("nodes.id", ondelete="CASCADE"))
+    design_id: Mapped[str | None] = mapped_column(String, ForeignKey("designs.id", ondelete="SET NULL"), nullable=True)
     type: Mapped[str] = mapped_column(String, default="ethernet")
     label: Mapped[str | None] = mapped_column(String)
     vlan_id: Mapped[int | None] = mapped_column(Integer)
@@ -77,7 +90,7 @@ class Edge(Base):
 class CanvasState(Base):
     __tablename__ = "canvas_state"
 
-    id: Mapped[int] = mapped_column(Integer, primary_key=True, default=1)
+    design_id: Mapped[str] = mapped_column(String, ForeignKey("designs.id", ondelete="CASCADE"), primary_key=True)
     viewport: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict)
     custom_style: Mapped[dict[str, Any] | None] = mapped_column(JSON, nullable=True)
     saved_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_now)

backend/app/main.py

@@ -7,7 +7,7 @@ from typing import Any
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
-from app.api.routes import auth, canvas, edges, liveview, nodes, scan, stats, status, zigbee
+from app.api.routes import auth, canvas, designs, edges, liveview, nodes, scan, stats, status, zigbee
 from app.api.routes import settings as settings_routes
 from app.core.config import settings
 from app.core.scheduler import start_scheduler, stop_scheduler
@@ -51,6 +51,7 @@ app.include_router(auth.router, prefix="/api/v1/auth", tags=["auth"])
 app.include_router(nodes.router, prefix="/api/v1/nodes", tags=["nodes"])
 app.include_router(edges.router, prefix="/api/v1/edges", tags=["edges"])
 app.include_router(canvas.router, prefix="/api/v1/canvas", tags=["canvas"])
+app.include_router(designs.router, prefix="/api/v1/designs", tags=["designs"])
 app.include_router(scan.router, prefix="/api/v1/scan", tags=["scan"])
 app.include_router(status.router, prefix="/api/v1/status", tags=["status"])
 app.include_router(settings_routes.router, prefix="/api/v1/settings", tags=["settings"])

backend/app/schemas/canvas.py

@@ -63,6 +63,7 @@ class CanvasSaveRequest(BaseModel):
     edges: list[EdgeSave] = []
     viewport: dict[str, Any] = {}
     custom_style: dict[str, Any] | None = None
+    design_id: str | None = None
 
 
 class CanvasStateResponse(BaseModel):

backend/app/schemas/designs.py

@@ -0,0 +1,27 @@
+from datetime import datetime
+
+from pydantic import BaseModel
+
+
+class DesignCreate(BaseModel):
+    name: str
+    icon: str = "dashboard"
+    # Vestigial: kept for backward compatibility. The UI no longer branches on it;
+    # the chosen icon now drives presentation. Defaults to a generic canvas.
+    design_type: str = "network"
+
+
+class DesignUpdate(BaseModel):
+    name: str | None = None
+    icon: str | None = None
+
+
+class DesignResponse(BaseModel):
+    id: str
+    name: str
+    design_type: str
+    icon: str | None = None
+    created_at: datetime
+    updated_at: datetime
+
+    model_config = {"from_attributes": True}

backend/app/schemas/edges.py

@@ -26,7 +26,7 @@ class EdgeBase(BaseModel):
 
 
 class EdgeCreate(EdgeBase):
-    pass
+    design_id: str | None = None
 
 
 class EdgeUpdate(BaseModel):

backend/app/schemas/nodes.py

@@ -34,7 +34,7 @@ class NodeBase(BaseModel):
 
 
 class NodeCreate(NodeBase):
-    pass
+    design_id: str | None = None
 
 
 class NodeUpdate(BaseModel):
@@ -68,6 +68,8 @@ class NodeUpdate(BaseModel):
 
 class NodeResponse(NodeBase):
     id: str
+    design_id: str | None = None
+    ieee_address: str | None = None
     last_seen: datetime | None = None
     response_time_ms: int | None = None
     created_at: datetime

backend/requirements.txt

@@ -15,7 +15,7 @@ pyyaml==6.0.2
 types-PyYAML==6.0.12.20240917
 websockets==13.1
 httpx==0.27.2
-zeroconf==0.131.0
+zeroconf==0.149.7
 aiomqtt==2.3.0
 
 # Dev

backend/tests/test_designs.py

@@ -0,0 +1,165 @@
+import uuid
+
+import pytest
+from httpx import AsyncClient
+
+
+@pytest.fixture
+async def headers(client: AsyncClient):
+    res = await client.post("/api/v1/auth/login", json={"username": "admin", "password": "admin"})
+    return {"Authorization": f"Bearer {res.json()['access_token']}"}
+
+
+def node_payload(**kwargs):
+    return {"id": str(uuid.uuid4()), "type": "server", "label": "N", "status": "unknown", "pos_x": 0, "pos_y": 0, **kwargs}
+
+
+def edge_payload(src, tgt, **kwargs):
+    return {"id": str(uuid.uuid4()), "source": src, "target": tgt, "type": "ethernet", **kwargs}
+
+
+async def _create(client: AsyncClient, headers: dict, **body) -> dict:
+    res = await client.post("/api/v1/designs", json={"name": "D", **body}, headers=headers)
+    assert res.status_code == 201, res.text
+    return res.json()
+
+
+# ── auth ──────────────────────────────────────────────────────────────────────
+
+async def test_list_designs_requires_auth(client: AsyncClient):
+    res = await client.get("/api/v1/designs")
+    assert res.status_code == 401
+
+
+async def test_create_design_requires_auth(client: AsyncClient):
+    res = await client.post("/api/v1/designs", json={"name": "X"})
+    assert res.status_code == 401
+
+
+# ── list / create ─────────────────────────────────────────────────────────────
+
+async def test_list_designs_empty(client: AsyncClient, headers: dict):
+    res = await client.get("/api/v1/designs", headers=headers)
+    assert res.status_code == 200
+    assert res.json() == []
+
+
+async def test_create_design_defaults(client: AsyncClient, headers: dict):
+    design = await _create(client, headers, name="Workshop")
+    assert design["name"] == "Workshop"
+    assert design["design_type"] == "network"
+    assert design["icon"] == "dashboard"
+    assert "id" in design and design["id"]
+
+
+async def test_create_design_explicit_type(client: AsyncClient, headers: dict):
+    design = await _create(client, headers, name="Net", design_type="network")
+    assert design["design_type"] == "network"
+
+
+async def test_create_design_with_custom_icon(client: AsyncClient, headers: dict):
+    design = await _create(client, headers, name="Power", icon="zap")
+    assert design["icon"] == "zap"
+
+
+async def test_update_design_changes_icon(client: AsyncClient, headers: dict):
+    design = await _create(client, headers, name="D", icon="dashboard")
+    res = await client.put(f"/api/v1/designs/{design['id']}", json={"icon": "server"}, headers=headers)
+    assert res.status_code == 200
+    assert res.json()["icon"] == "server"
+    # Name left untouched when only icon is sent.
+    assert res.json()["name"] == "D"
+
+
+async def test_update_design_name_and_icon_together(client: AsyncClient, headers: dict):
+    design = await _create(client, headers, name="Old", icon="dashboard")
+    res = await client.put(
+        f"/api/v1/designs/{design['id']}", json={"name": "New", "icon": "network"}, headers=headers,
+    )
+    assert res.status_code == 200
+    body = res.json()
+    assert body["name"] == "New"
+    assert body["icon"] == "network"
+
+
+async def test_create_design_creates_empty_canvas_state(client: AsyncClient, headers: dict):
+    design = await _create(client, headers, name="Has Canvas")
+    # Loading the new design returns an (empty) canvas without falling back to another design.
+    res = await client.get("/api/v1/canvas", params={"design_id": design["id"]}, headers=headers)
+    assert res.status_code == 200
+    body = res.json()
+    assert body["nodes"] == []
+    assert body["edges"] == []
+
+
+async def test_list_returns_created_designs_ordered(client: AsyncClient, headers: dict):
+    a = await _create(client, headers, name="First")
+    b = await _create(client, headers, name="Second")
+    listed = (await client.get("/api/v1/designs", headers=headers)).json()
+    ids = [d["id"] for d in listed]
+    assert ids == [a["id"], b["id"]]
+
+
+# ── update ────────────────────────────────────────────────────────────────────
+
+async def test_update_design_renames(client: AsyncClient, headers: dict):
+    design = await _create(client, headers, name="Old Name")
+    res = await client.put(f"/api/v1/designs/{design['id']}", json={"name": "New Name"}, headers=headers)
+    assert res.status_code == 200
+    assert res.json()["name"] == "New Name"
+
+
+async def test_update_design_missing_returns_404(client: AsyncClient, headers: dict):
+    res = await client.put(f"/api/v1/designs/{uuid.uuid4()}", json={"name": "X"}, headers=headers)
+    assert res.status_code == 404
+
+
+# ── delete ────────────────────────────────────────────────────────────────────
+
+async def test_delete_last_design_blocked(client: AsyncClient, headers: dict):
+    design = await _create(client, headers, name="Only One")
+    res = await client.delete(f"/api/v1/designs/{design['id']}", headers=headers)
+    assert res.status_code == 400
+
+
+async def test_delete_design_missing_returns_404(client: AsyncClient, headers: dict):
+    # Need >1 design so we get past nothing; 404 path is checked before the count guard.
+    await _create(client, headers, name="Keep")
+    res = await client.delete(f"/api/v1/designs/{uuid.uuid4()}", headers=headers)
+    assert res.status_code == 404
+
+
+async def test_delete_design_removes_its_nodes_edges_and_canvas(client: AsyncClient, headers: dict):
+    keep = await _create(client, headers, name="Keep")
+    victim = await _create(client, headers, name="Victim")
+
+    # Populate the victim design with nodes + an edge via canvas save.
+    n1 = node_payload(label="A")
+    n2 = node_payload(label="B")
+    e1 = edge_payload(n1["id"], n2["id"])
+    save = await client.post(
+        "/api/v1/canvas/save",
+        json={"nodes": [n1, n2], "edges": [e1], "viewport": {}, "design_id": victim["id"]},
+        headers=headers,
+    )
+    assert save.status_code == 200
+
+    # Populate the kept design too, to prove scoping.
+    k1 = node_payload(label="K")
+    await client.post(
+        "/api/v1/canvas/save",
+        json={"nodes": [k1], "edges": [], "viewport": {}, "design_id": keep["id"]},
+        headers=headers,
+    )
+
+    res = await client.delete(f"/api/v1/designs/{victim['id']}", headers=headers)
+    assert res.status_code == 204
+
+    # Victim gone from list.
+    listed = (await client.get("/api/v1/designs", headers=headers)).json()
+    assert [d["id"] for d in listed] == [keep["id"]]
+
+    # Kept design's node survives untouched.
+    kept_canvas = (await client.get("/api/v1/canvas", params={"design_id": keep["id"]}, headers=headers)).json()
+    assert len(kept_canvas["nodes"]) == 1
+    assert kept_canvas["nodes"][0]["label"] == "K"

frontend/src/App.tsx

@@ -28,9 +28,10 @@ import { SearchModal } from '@/components/modals/SearchModal'
 import { PendingDevicesModal } from '@/components/modals/PendingDevicesModal'
 import { ShortcutsModal } from '@/components/modals/ShortcutsModal'
 import { useCanvasStore } from '@/stores/canvasStore'
+import { useDesignStore } from '@/stores/designStore'
 import { useAuthStore } from '@/stores/authStore'
 import { useThemeStore } from '@/stores/themeStore'
-import { canvasApi } from '@/api/client'
+import { canvasApi, designsApi } from '@/api/client'
 import { demoNodes, demoEdges } from '@/utils/demoData'
 import { useStatusPolling } from '@/hooks/useStatusPolling'
 import type { NodeData, EdgeData, CustomStyleDef } from '@/types'
@@ -44,6 +45,7 @@ export default function App() {
   const canvasRef = useRef<HTMLDivElement>(null)
   const { isAuthenticated } = useAuthStore()
   const { activeTheme, setTheme, customStyle, setCustomStyle } = useThemeStore()
+  const { activeDesignId, setDesigns, setActiveDesign } = useDesignStore()
 
   useStatusPolling()
 
@@ -70,29 +72,75 @@ export default function App() {
   const [exportModalOpen, setExportModalOpen] = useState(false)
   const [zigbeeImportOpen, setZigbeeImportOpen] = useState(false)
 
-  // Declare handleSave before the Ctrl+S effect so it is in scope
+  // Declare handleSave before the Ctrl+S effect so it is in scope.
-  const handleSave = useCallback(async () => {
+  // Returns true on success, false on failure — the design-switch effect relies
+  // on this to avoid loading (and clobbering) the canvas when a save fails.
+  const handleSave = useCallback(async (designIdOverride?: string): Promise<boolean> => {
     try {
+      const saveDesignId = designIdOverride ?? activeDesignId
       if (STANDALONE) {
         localStorage.setItem(STANDALONE_STORAGE_KEY, JSON.stringify({ nodes, edges, theme_id: activeTheme, custom_style: customStyle }))
         markSaved()
         toast.success('Canvas saved')
-        return
+        return true
       }
       const nodesToSave = nodes.map(serializeNode)
       const edgesToSave = edges.map(serializeEdge)
-      await canvasApi.save({ nodes: nodesToSave, edges: edgesToSave, viewport: { theme_id: activeTheme }, custom_style: customStyle })
+      await canvasApi.save({ nodes: nodesToSave, edges: edgesToSave, viewport: { theme_id: activeTheme }, custom_style: customStyle, design_id: saveDesignId })
       markSaved()
       toast.success('Canvas saved')
+      return true
     } catch {
       toast.error('Save failed')
+      return false
     }
-  }, [nodes, edges, markSaved, activeTheme, customStyle])
+  }, [nodes, edges, markSaved, activeTheme, customStyle, activeDesignId])
 
   // Keep a ref so the keydown handler always calls the latest version
   const handleSaveRef = useRef(handleSave)
   useEffect(() => { handleSaveRef.current = handleSave }, [handleSave])
 
+  const loadCanvasFromApi = useCallback(async (designId?: string) => {
+    try {
+      const res = await canvasApi.load(designId)
+      const { nodes: apiNodes, edges: apiEdges } = res.data
+      if (apiNodes.length > 0) {
+        const proxmoxContainerMap = new Map<string, boolean>(
+          (apiNodes as ApiNode[])
+            .filter((n) => n.type === 'group' || n.container_mode === true)
+            .map((n) => [n.id, true])
+        )
+        const rfNodes = (apiNodes as ApiNode[]).map((n) => deserializeApiNode(n, proxmoxContainerMap))
+        const rfEdges = (apiEdges as ApiEdge[]).map(deserializeApiEdge)
+        const savedTheme = res.data.viewport?.theme_id
+        if (savedTheme) setTheme(savedTheme)
+        if (res.data.custom_style) setCustomStyle(res.data.custom_style as CustomStyleDef)
+        loadCanvas(rfNodes, rfEdges)
+      } else {
+        loadCanvas(demoNodes, demoEdges)
+      }
+    } catch {
+      loadCanvas(demoNodes, demoEdges)
+    }
+  }, [loadCanvas, setTheme, setCustomStyle])
+
+  const loadDesignsAndCanvas = useCallback(async () => {
+    if (STANDALONE) return
+    try {
+      const res = await designsApi.list()
+      const loadedDesigns = res.data
+      setDesigns(loadedDesigns)
+      const targetId = activeDesignId ?? loadedDesigns[0]?.id
+      if (targetId) {
+        setActiveDesign(targetId)
+        await loadCanvasFromApi(targetId)
+      }
+    } catch {
+      // If API fails (e.g. fresh DB with no designs), fall back to demo data
+      loadCanvas(demoNodes, demoEdges)
+    }
+  }, [setDesigns, setActiveDesign, loadCanvasFromApi, activeDesignId, loadCanvas])
+
   // Load canvas on auth (or immediately in standalone mode)
   useEffect(() => {
     if (STANDALONE) {
@@ -112,28 +160,53 @@ export default function App() {
       return
     }
     if (!isAuthenticated) return
-    canvasApi.load()
+    loadDesignsAndCanvas()
-      .then((res) => {
+  }, [isAuthenticated, loadCanvas, setTheme, setCustomStyle]) // only on auth change, not design change
-        const { nodes: apiNodes, edges: apiEdges } = res.data
+
-        if (apiNodes.length > 0) {
+  // Reload canvas when active design changes (after initial load)
-          // Build a map of container mode nodes to know if children should be nested
+  const initialLoadDone = useRef(false)
-          const proxmoxContainerMap = new Map<string, boolean>(
+  const prevDesignRef = useRef<string | null>(null)
-            (apiNodes as ApiNode[])
+  // Set while we programmatically revert activeDesignId after a failed save, so
-              .filter((n) => n.type === 'group' || n.container_mode === true)
+  // the re-entrant effect run skips save/load and just re-syncs the refs.
-              .map((n) => [n.id, true])
+  const revertingRef = useRef(false)
-          )
+  useEffect(() => {
-          const rfNodes = (apiNodes as ApiNode[]).map((n) => deserializeApiNode(n, proxmoxContainerMap))
+    if (revertingRef.current) {
-          const rfEdges = (apiEdges as ApiEdge[]).map(deserializeApiEdge)
+      revertingRef.current = false
-          const savedTheme = res.data.viewport?.theme_id
+      prevDesignRef.current = activeDesignId
-          if (savedTheme) setTheme(savedTheme)
+      return
-          if (res.data.custom_style) setCustomStyle(res.data.custom_style as CustomStyleDef)
+    }
-          loadCanvas(rfNodes, rfEdges)
+    if (!STANDALONE && isAuthenticated && activeDesignId && initialLoadDone.current) {
+      const oldId = prevDesignRef.current
+      // If the previous design was deleted (no longer in the list), don't try to
+      // save into it — just load the newly-selected design.
+      const oldStillExists = oldId ? useDesignStore.getState().designs.some((d) => d.id === oldId) : false
+      if (oldId && oldId !== activeDesignId && oldStillExists) {
+        // Save current (old) canvas data under the old design ID before switching.
+        // We call handleSave directly (not via ref) so it runs in this effect's
+        // closure where activeDesignId is already the NEW value — the override
+        // ensures data is stored under the correct design_id.
+        const targetId = activeDesignId
+        handleSave(oldId).then((ok) => {
+          if (ok) {
+            loadCanvasFromApi(targetId)
           } else {
-          loadCanvas(demoNodes, demoEdges)
+            // Save failed: don't load the new design — that would overwrite the
+            // unsaved in-memory canvas. Revert the selection back to the old
+            // design so the UI matches the data still on screen.
+            toast.error('Switch cancelled — unsaved changes kept')
+            revertingRef.current = true
+            setActiveDesign(oldId)
           }
         })
-      .catch(() => loadCanvas(demoNodes, demoEdges))
+      } else {
-  }, [isAuthenticated, loadCanvas, setTheme, setCustomStyle])
+        loadCanvasFromApi(activeDesignId)
+      }
+    }
+    if (activeDesignId) {
+      prevDesignRef.current = activeDesignId
+      initialLoadDone.current = true
+    }
+  }, [activeDesignId])
 
   // Keep refs for store actions so keydown handler is always up-to-date without re-registering
   const undoRef = useRef(undo)

frontend/src/api/__tests__/client.test.ts

@@ -127,7 +127,7 @@ describe('api/client', () => {
 
   it('canvasApi.load GETs /canvas', () => {
     mod.canvasApi.load()
-    expect(api.get).toHaveBeenCalledWith('/canvas')
+    expect(api.get).toHaveBeenCalledWith('/canvas', expect.objectContaining({}))
   })
 
   it('canvasApi.save POSTs to /canvas/save with payload', () => {

frontend/src/api/client.ts

@@ -28,12 +28,16 @@ export const authApi = {
 }
 
 export const canvasApi = {
-  load: () => api.get('/canvas'),
+  load: (design_id?: string) => {
+    const params = design_id ? { design_id } : {}
+    return api.get('/canvas', { params })
+  },
   save: (payload: {
     nodes: object[]
     edges: object[]
     viewport: object
     custom_style?: object | null
+    design_id?: string | null
   }) => api.post('/canvas/save', payload),
 }
 
@@ -89,6 +93,15 @@ export const settingsApi = {
   save: (data: { interval_seconds: number }) => api.post<{ interval_seconds: number }>('/settings', data),
 }
 
+export const designsApi = {
+  list: () => api.get<import('@/types').Design[]>('/designs'),
+  create: (data: { name: string; icon?: string; design_type?: string }) =>
+    api.post<import('@/types').Design>('/designs', data),
+  update: (id: string, data: { name?: string; icon?: string }) =>
+    api.put<import('@/types').Design>(`/designs/${id}`, data),
+  delete: (id: string) => api.delete(`/designs/${id}`),
+}
+
 export const zigbeeApi = {
   testConnection: (data: {
     mqtt_host: string

frontend/src/components/canvas/__tests__/BaseNode.test.tsx

@@ -59,7 +59,10 @@ vi.mock('@/utils/propertyIcons', () => ({
 
 vi.mock('@/utils/handleUtils', () => ({
   bottomHandleId: (idx: number) => idx === 0 ? 'bottom' : `bottom-${idx + 1}`,
-  bottomHandlePositions: () => [50],
+  bottomHandlePositions: (count: number) => {
+    const c = typeof count === 'number' && count > 0 ? Math.floor(count) : 1
+    return Array.from({ length: c }, (_, i) => ((i + 1) * 100) / (c + 1))
+  },
   clampBottomHandles: (n: unknown) => typeof n === 'number' ? n : 1,
 }))
 
@@ -171,6 +174,29 @@ describe('BaseNode — properties rendering', () => {
   })
 })
 
+describe('BaseNode — port numbers (issue #20)', () => {
+  it('renders a number above each bottom handle when show_port_numbers is on', () => {
+    renderBaseNode({ bottom_handles: 4, show_port_numbers: true })
+    expect(screen.getByText('1')).toBeDefined()
+    expect(screen.getByText('2')).toBeDefined()
+    expect(screen.getByText('3')).toBeDefined()
+    expect(screen.getByText('4')).toBeDefined()
+  })
+
+  it('does not render port numbers when show_port_numbers is off', () => {
+    renderBaseNode({ bottom_handles: 4 })
+    expect(screen.queryByText('1')).toBeNull()
+    expect(screen.queryByText('4')).toBeNull()
+  })
+
+  it('numbers match the handle count', () => {
+    renderBaseNode({ bottom_handles: 2, show_port_numbers: true })
+    expect(screen.getByText('1')).toBeDefined()
+    expect(screen.getByText('2')).toBeDefined()
+    expect(screen.queryByText('3')).toBeNull()
+  })
+})
+
 describe('BaseNode — services visibility toggle', () => {
   it('does not render service toggle button on the node', () => {
     renderBaseNode({ services: [{ service_name: 'nginx', port: 80, protocol: 'tcp' }] })

frontend/src/components/canvas/edges/__tests__/edgeTypes.test.ts

@@ -0,0 +1,17 @@
+import { describe, it, expect } from 'vitest'
+import { edgeTypes } from '../edgeTypes'
+import { EDGE_TYPE_LABELS, type EdgeType } from '@/types'
+
+describe('edgeTypes registry', () => {
+  // Regression (issue #21): an EdgeType missing here makes React Flow fall back
+  // to its built-in default edge — grey, unstyled, ignoring custom_color.
+  it('registers a component for every EdgeType', () => {
+    for (const type of Object.keys(EDGE_TYPE_LABELS) as EdgeType[]) {
+      expect(edgeTypes[type as keyof typeof edgeTypes]).toBeDefined()
+    }
+  })
+
+  it('registers fibre', () => {
+    expect(edgeTypes.fibre).toBeDefined()
+  })
+})

frontend/src/components/canvas/edges/edgeTypes.ts

@@ -7,4 +7,6 @@ export const edgeTypes = {
   vlan: HomelableEdge,
   virtual: HomelableEdge,
   cluster: HomelableEdge,
+  fibre: HomelableEdge,
+  electrical: HomelableEdge,
 }

frontend/src/components/canvas/edges/index.tsx

@@ -323,6 +323,8 @@ export function HomelableEdge({ id, source, target, sourceHandleId, targetHandle
     vlan:     { strokeWidth: 2.5 },
     virtual:  { stroke: edgeColors.virtual,  strokeWidth: 1,   strokeDasharray: '4 4' },
     cluster:  { stroke: edgeColors.cluster,  strokeWidth: 2.5, strokeDasharray: '8 3' },
+    fibre:    { stroke: edgeColors.fibre,    strokeWidth: 2.5, filter: `drop-shadow(0 0 3px ${edgeColors.fibre}aa)` },
+    electrical: { stroke: edgeColors.electrical, strokeWidth: 2 },
   }
 
   const customColor = data?.custom_color as string | undefined

frontend/src/components/canvas/nodes/BaseNode.tsx

@@ -254,6 +254,20 @@ export function BaseNode({ id, data, selected, icon: typeIcon, width, height }:
         const targetId = `${sourceId}-t`
         return (
           <span key={sourceId}>
+            {data.show_port_numbers && (
+              <span
+                className="absolute font-mono leading-none pointer-events-none select-none"
+                style={{
+                  left: `${leftPct}%`,
+                  bottom: 3,
+                  transform: 'translateX(-50%)',
+                  fontSize: 7,
+                  color: theme.colors.nodeSubtextColor,
+                }}
+              >
+                {idx + 1}
+              </span>
+            )}
             <Handle
               type="source"
               position={Position.Bottom}

frontend/src/components/canvas/nodes/index.tsx

@@ -2,6 +2,7 @@ import { type NodeProps, type Node } from '@xyflow/react'
 import {
   Globe, Router, Network, Server, Layers, Box, Container,
   HardDrive, Cpu, Wifi, Circle, Cctv, Printer, Monitor, Laptop, Smartphone, PlugZap, Anchor, Package, Flame, Radio, Antenna,
+  Grid3x3, Battery, Fuel, Sun, Repeat2, Split, ToggleLeft, Lightbulb, Gauge, Combine, Cable, Zap,
 } from 'lucide-react'
 import { BaseNode } from './BaseNode'
 import type { NodeData } from '@/types'
@@ -32,3 +33,19 @@ export const GenericNode  = (props: N) => <BaseNode {...props} icon={Circle} />
 export const ZigbeeCoordinatorNode = (props: N) => <BaseNode {...props} icon={Network} />
 export const ZigbeeRouterNode      = (props: N) => <BaseNode {...props} icon={Radio} />
 export const ZigbeeEndDeviceNode   = (props: N) => <BaseNode {...props} icon={Antenna} />
+
+// Electrical node types
+export const GridNode          = (props: N) => <BaseNode {...props} icon={Grid3x3} />
+export const UpsNode           = (props: N) => <BaseNode {...props} icon={Battery} />
+export const BatteryNode        = (props: N) => <BaseNode {...props} icon={Battery} />
+export const GeneratorNode     = (props: N) => <BaseNode {...props} icon={Fuel} />
+export const SolarPanelNode    = (props: N) => <BaseNode {...props} icon={Sun} />
+export const InverterNode      = (props: N) => <BaseNode {...props} icon={Repeat2} />
+export const CircuitBreakerNode = (props: N) => <BaseNode {...props} icon={Split} />
+export const ContactorNode     = (props: N) => <BaseNode {...props} icon={ToggleLeft} />
+export const ElectricalSwitchNode = (props: N) => <BaseNode {...props} icon={ToggleLeft} />
+export const SocketNode        = (props: N) => <BaseNode {...props} icon={Cable} />
+export const LightNode         = (props: N) => <BaseNode {...props} icon={Lightbulb} />
+export const MeterNode         = (props: N) => <BaseNode {...props} icon={Gauge} />
+export const TransformerNode   = (props: N) => <BaseNode {...props} icon={Combine} />
+export const LoadNode          = (props: N) => <BaseNode {...props} icon={Zap} />

frontend/src/components/canvas/nodes/nodeTypes.ts

@@ -1,4 +1,12 @@
-import { IspNode, RouterNode, FirewallNode, SwitchNode, ServerNode, VmNode, LxcNode, NasNode, IotNode, ApNode, CameraNode, PrinterNode, ComputerNode, LaptopNode, MobileNode, CplNode, DockerHostNode, DockerContainerNode, GenericNode, ZigbeeCoordinatorNode, ZigbeeRouterNode, ZigbeeEndDeviceNode } from './index'
+import {
+  IspNode, RouterNode, FirewallNode, SwitchNode, ServerNode, VmNode, LxcNode,
+  NasNode, IotNode, ApNode, CameraNode, PrinterNode, ComputerNode, LaptopNode,
+  MobileNode, CplNode, DockerHostNode, DockerContainerNode, GenericNode,
+  ZigbeeCoordinatorNode, ZigbeeRouterNode, ZigbeeEndDeviceNode,
+  GridNode, UpsNode, BatteryNode, GeneratorNode, SolarPanelNode, InverterNode,
+  CircuitBreakerNode, ContactorNode, ElectricalSwitchNode, SocketNode,
+  LightNode, MeterNode, TransformerNode, LoadNode,
+} from './index'
 import { ProxmoxGroupNode } from './ProxmoxGroupNode'
 import { GroupRectNode } from './GroupRectNode'
 import { GroupNode } from './GroupNode'
@@ -31,4 +39,18 @@ export const nodeTypes = {
   zigbee_coordinator: ZigbeeCoordinatorNode,
   zigbee_router: ZigbeeRouterNode,
   zigbee_enddevice: ZigbeeEndDeviceNode,
+  grid: GridNode,
+  ups: UpsNode,
+  battery: BatteryNode,
+  generator: GeneratorNode,
+  solar_panel: SolarPanelNode,
+  inverter: InverterNode,
+  circuit_breaker: CircuitBreakerNode,
+  contactor: ContactorNode,
+  electrical_switch: ElectricalSwitchNode,
+  socket: SocketNode,
+  light: LightNode,
+  meter: MeterNode,
+  transformer: TransformerNode,
+  load: LoadNode,
 }

frontend/src/components/modals/CustomStyleModal.tsx

@@ -26,7 +26,7 @@ const EDITABLE_NODE_TYPES: NodeType[] = [
   'generic',
 ]
 
-const EDITABLE_EDGE_TYPES: EdgeType[] = ['ethernet', 'wifi', 'iot', 'vlan', 'virtual', 'cluster']
+const EDITABLE_EDGE_TYPES: EdgeType[] = ['ethernet', 'wifi', 'iot', 'vlan', 'virtual', 'cluster', 'fibre', 'electrical']
 
 const NODE_ICONS: Record<string, LucideIcon> = {
   isp: Globe, router: Router, firewall: Flame, switch: Network, server: Server, proxmox: Layers,

frontend/src/components/modals/DesignModal.tsx

@@ -0,0 +1,87 @@
+import { useState } from 'react'
+import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter } from '@/components/ui/dialog'
+import { Button } from '@/components/ui/button'
+import { Label } from '@/components/ui/label'
+import { Input } from '@/components/ui/input'
+import { DESIGN_ICONS, DEFAULT_DESIGN_ICON } from '@/utils/designIcons'
+
+export interface DesignFormData {
+  name: string
+  icon: string
+}
+
+interface DesignModalProps {
+  open: boolean
+  onClose: () => void
+  onSubmit: (data: DesignFormData) => void
+  initial?: DesignFormData
+  title?: string
+  submitLabel?: string
+}
+
+export function DesignModal({ open, onClose, onSubmit, initial, title = 'New Canvas', submitLabel = 'Create' }: DesignModalProps) {
+  const [name, setName] = useState(initial?.name ?? '')
+  const [icon, setIcon] = useState(initial?.icon ?? DEFAULT_DESIGN_ICON)
+
+  const handleSubmit = () => {
+    const trimmed = name.trim()
+    if (!trimmed) return
+    onSubmit({ name: trimmed, icon })
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={(o) => !o && onClose()}>
+      <DialogContent className="sm:max-w-md">
+        <DialogHeader>
+          <DialogTitle>{title}</DialogTitle>
+        </DialogHeader>
+
+        <div className="space-y-4 py-2">
+          <div className="space-y-1.5">
+            <Label htmlFor="design-name">Name</Label>
+            <Input
+              id="design-name"
+              value={name}
+              onChange={(e) => setName(e.target.value)}
+              onKeyDown={(e) => { if (e.key === 'Enter') handleSubmit() }}
+              placeholder="e.g. Home Network, Rack Power"
+              autoFocus
+            />
+          </div>
+
+          <div className="space-y-1.5">
+            <Label>Icon</Label>
+            <div className="grid grid-cols-8 gap-1.5">
+              {DESIGN_ICONS.map((entry) => {
+                const Icon = entry.icon
+                const selected = entry.key === icon
+                return (
+                  <button
+                    key={entry.key}
+                    type="button"
+                    aria-label={entry.label}
+                    aria-pressed={selected}
+                    title={entry.label}
+                    onClick={() => setIcon(entry.key)}
+                    className={`flex items-center justify-center aspect-square rounded-md border transition-colors cursor-pointer ${
+                      selected
+                        ? 'border-[#00d4ff] bg-[#00d4ff]/10 text-[#00d4ff]'
+                        : 'border-border text-muted-foreground hover:text-foreground hover:border-[#30363d]'
+                    }`}
+                  >
+                    <Icon size={16} />
+                  </button>
+                )
+              })}
+            </div>
+          </div>
+        </div>
+
+        <DialogFooter>
+          <Button variant="ghost" onClick={onClose}>Cancel</Button>
+          <Button onClick={handleSubmit} disabled={!name.trim()}>{submitLabel}</Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  )
+}

frontend/src/components/modals/NodeModal.tsx

@@ -19,6 +19,7 @@ const NODE_TYPE_GROUPS: { label: string; types: NodeType[] }[] = [
   { label: 'IoT',            types: ['iot', 'camera', 'cpl'] },
   { label: 'Zigbee',         types: ['zigbee_coordinator', 'zigbee_router', 'zigbee_enddevice'] },
   { label: 'Personal',       types: ['computer', 'laptop', 'mobile'] },
+  { label: 'Electrical',     types: ['grid', 'ups', 'battery', 'generator', 'solar_panel', 'inverter', 'circuit_breaker', 'contactor', 'electrical_switch', 'socket', 'light', 'meter', 'transformer', 'load'] },
   { label: 'Generic',        types: ['generic', 'groupRect'] },
 ]
 
@@ -513,6 +514,27 @@ export function NodeModal({ open, onClose, onSubmit, initial, title = 'Add Node'
                   <span>{MIN_BOTTOM_HANDLES}</span>
                   <span>{MAX_BOTTOM_HANDLES}</span>
                 </div>
+                <div className="flex items-center justify-between pt-1">
+                  <div className="flex flex-col gap-0.5">
+                    <Label className="text-xs text-muted-foreground">Show Port Numbers</Label>
+                    <span className="text-[10px] text-muted-foreground/60">Label each bottom connection point</span>
+                  </div>
+                  <button
+                    type="button"
+                    role="switch"
+                    aria-checked={!!form.show_port_numbers}
+                    onClick={() => set('show_port_numbers', !form.show_port_numbers)}
+                    className={`relative inline-flex h-5 w-9 shrink-0 cursor-pointer rounded-full transition-colors focus:outline-none ${modalStyles['modal-interactive']}`}
+                    tabIndex={0}
+                    aria-label="Toggle port numbers"
+                    style={{ background: form.show_port_numbers ? '#ff6e00' : '#30363d' }}
+                  >
+                    <span
+                      className="pointer-events-none absolute top-0.5 h-4 w-4 rounded-full bg-white shadow-sm transition-all"
+                      style={{ left: form.show_port_numbers ? 'calc(100% - 18px)' : '2px' }}
+                    />
+                  </button>
+                </div>
               </div>
             )}
 

frontend/src/components/modals/__tests__/DesignModal.test.tsx

@@ -0,0 +1,67 @@
+import { describe, it, expect, vi } from 'vitest'
+import { render, screen, fireEvent } from '@testing-library/react'
+import { DesignModal } from '../DesignModal'
+import { DEFAULT_DESIGN_ICON } from '@/utils/designIcons'
+
+function renderModal(props: Partial<Parameters<typeof DesignModal>[0]> = {}) {
+  const onClose = vi.fn()
+  const onSubmit = vi.fn()
+  render(<DesignModal open onClose={onClose} onSubmit={onSubmit} {...props} />)
+  return { onClose, onSubmit }
+}
+
+describe('DesignModal', () => {
+  it('creates with the typed name and default icon', () => {
+    const { onSubmit } = renderModal()
+    fireEvent.change(screen.getByLabelText('Name'), { target: { value: 'Home Network' } })
+    fireEvent.click(screen.getByRole('button', { name: 'Create' }))
+    expect(onSubmit).toHaveBeenCalledWith({ name: 'Home Network', icon: DEFAULT_DESIGN_ICON })
+  })
+
+  it('submits the selected icon', () => {
+    const { onSubmit } = renderModal()
+    fireEvent.change(screen.getByLabelText('Name'), { target: { value: 'Rack Power' } })
+    fireEvent.click(screen.getByRole('button', { name: 'Electrical' })) // zap icon's aria-label
+    fireEvent.click(screen.getByRole('button', { name: 'Create' }))
+    expect(onSubmit).toHaveBeenCalledWith({ name: 'Rack Power', icon: 'zap' })
+  })
+
+  it('trims whitespace and blocks empty names', () => {
+    const { onSubmit } = renderModal()
+    // Empty → submit disabled, no call.
+    const submit = screen.getByRole('button', { name: 'Create' })
+    expect(submit).toBeDisabled()
+
+    fireEvent.change(screen.getByLabelText('Name'), { target: { value: '  Spaced  ' } })
+    fireEvent.click(submit)
+    expect(onSubmit).toHaveBeenCalledWith({ name: 'Spaced', icon: DEFAULT_DESIGN_ICON })
+  })
+
+  it('prefills name and icon in edit mode', () => {
+    const { onSubmit } = renderModal({
+      initial: { name: 'Existing', icon: 'server' },
+      title: 'Edit Canvas',
+      submitLabel: 'Save',
+    })
+    expect(screen.getByLabelText('Name')).toHaveValue('Existing')
+    // The server icon button is pre-selected.
+    expect(screen.getByRole('button', { name: 'Server' })).toHaveAttribute('aria-pressed', 'true')
+    fireEvent.click(screen.getByRole('button', { name: 'Save' }))
+    expect(onSubmit).toHaveBeenCalledWith({ name: 'Existing', icon: 'server' })
+  })
+
+  it('submits on Enter from the name field', () => {
+    const { onSubmit } = renderModal()
+    const input = screen.getByLabelText('Name')
+    fireEvent.change(input, { target: { value: 'Quick' } })
+    fireEvent.keyDown(input, { key: 'Enter' })
+    expect(onSubmit).toHaveBeenCalledWith({ name: 'Quick', icon: DEFAULT_DESIGN_ICON })
+  })
+
+  it('calls onClose from Cancel', () => {
+    const { onClose, onSubmit } = renderModal()
+    fireEvent.click(screen.getByRole('button', { name: 'Cancel' }))
+    expect(onClose).toHaveBeenCalled()
+    expect(onSubmit).not.toHaveBeenCalled()
+  })
+})

frontend/src/components/modals/__tests__/EdgeModal.test.tsx

@@ -59,6 +59,13 @@ describe('EdgeModal', () => {
     expect(onSubmit.mock.calls[0][0].label).toBeUndefined()
   })
 
+  it('round-trips the fibre type through submit (issue #21)', () => {
+    const onSubmit = vi.fn()
+    render(<EdgeModal open onClose={vi.fn()} onSubmit={onSubmit} initial={{ type: 'fibre' }} />)
+    fireEvent.click(screen.getByRole('button', { name: 'Connect' }))
+    expect(onSubmit.mock.calls[0][0].type).toBe('fibre')
+  })
+
   // ── VLAN ID field ─────────────────────────────────────────────────────────
 
   it('does not show VLAN ID field for ethernet type', () => {

frontend/src/components/modals/__tests__/NodeModal.test.tsx

@@ -416,20 +416,30 @@ describe('NodeModal', () => {
     expect((onSubmit.mock.calls[0][0] as Partial<NodeData>).bottom_handles).toBe(12)
   })
 
-  it('supports the full 1..48 range', () => {
+  it('supports the full 1..64 range (issue #20)', () => {
     const { onSubmit } = renderModal({ initial: BASE })
     const slider = screen.getByLabelText('Bottom connection points slider') as HTMLInputElement
     expect(slider.min).toBe('1')
-    expect(slider.max).toBe('48')
+    expect(slider.max).toBe('64')
-    fireEvent.change(slider, { target: { value: '48' } })
+    fireEvent.change(slider, { target: { value: '52' } })
     fireEvent.click(screen.getByRole('button', { name: 'Add' }))
-    expect((onSubmit.mock.calls[0][0] as Partial<NodeData>).bottom_handles).toBe(48)
+    expect((onSubmit.mock.calls[0][0] as Partial<NodeData>).bottom_handles).toBe(52)
   })
 
-  it('clamps pre-filled out-of-range values into [1,48]', () => {
+  it('clamps pre-filled out-of-range values into [1,64]', () => {
     renderModal({ initial: { ...BASE, bottom_handles: 9999 } })
     const slider = screen.getByLabelText('Bottom connection points slider') as HTMLInputElement
-    expect(slider.value).toBe('48')
+    expect(slider.value).toBe('64')
+  })
+
+  it('toggles show_port_numbers and submits it (issue #20)', () => {
+    const { onSubmit } = renderModal({ initial: BASE })
+    const toggle = screen.getByLabelText('Toggle port numbers')
+    expect(toggle.getAttribute('aria-checked')).toBe('false')
+    fireEvent.click(toggle)
+    expect(toggle.getAttribute('aria-checked')).toBe('true')
+    fireEvent.click(screen.getByRole('button', { name: 'Add' }))
+    expect((onSubmit.mock.calls[0][0] as Partial<NodeData>).show_port_numbers).toBe(true)
   })
 
   // ── Zigbee nodes ──────────────────────────────────────────────────────

frontend/src/components/panels/Sidebar.tsx

@@ -1,10 +1,14 @@
 import { useState, useCallback, useEffect, useRef } from 'react'
-import { Plus, Save, ScanLine, ChevronLeft, ChevronRight, LayoutDashboard, Clock, EyeOff, RefreshCw, Loader2, Square, Eye, Settings, StopCircle, LogOut, Network, Type } from 'lucide-react'
+import { Plus, Save, ScanLine, ChevronLeft, ChevronRight, LayoutDashboard, Clock, EyeOff, RefreshCw, Loader2, Square, Eye, Settings, StopCircle, LogOut, Network, Type, PlusCircle, Pencil, Trash2 } from 'lucide-react'
 import { Logo } from '@/components/ui/Logo'
 import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip'
 import { useCanvasStore } from '@/stores/canvasStore'
+import { useDesignStore } from '@/stores/designStore'
 import { useAuthStore } from '@/stores/authStore'
-import { scanApi, settingsApi } from '@/api/client'
+import { designsApi, scanApi, settingsApi } from '@/api/client'
+import { resolveDesignIcon, DEFAULT_DESIGN_ICON } from '@/utils/designIcons'
+import { DesignModal, type DesignFormData } from '@/components/modals/DesignModal'
+import type { Design } from '@/types'
 import { toast } from 'sonner'
 import { useLatestRelease } from '@/hooks/useLatestRelease'
 import {
@@ -50,6 +54,37 @@ export function Sidebar({ onAddNode, onAddGroupRect, onAddText, onScan, onZigbee
   const [activeView, setActiveView] = useState<SidebarView>(forceView ?? 'canvas')
   const [prevForceView, setPrevForceView] = useState(forceView)
   const logout = useAuthStore((s) => s.logout)
+  const { designs, activeDesignId, setActiveDesign, addDesign, updateDesign, removeDesign } = useDesignStore()
+  const [designSwitcherOpen, setDesignSwitcherOpen] = useState(false)
+  const [designModal, setDesignModal] = useState<{ mode: 'create' | 'edit'; design?: Design } | null>(null)
+
+  const handleDesignSubmit = useCallback(async (data: DesignFormData) => {
+    if (!designModal) return
+    try {
+      if (designModal.mode === 'create') {
+        const res = await designsApi.create({ name: data.name, icon: data.icon })
+        addDesign(res.data)
+      } else if (designModal.design) {
+        const res = await designsApi.update(designModal.design.id, { name: data.name, icon: data.icon })
+        updateDesign(res.data.id, { name: res.data.name, icon: res.data.icon })
+      }
+      setDesignModal(null)
+    } catch {
+      toast.error(designModal.mode === 'create' ? 'Failed to create canvas' : 'Failed to update canvas')
+    }
+  }, [designModal, addDesign, updateDesign])
+
+  const handleDesignDelete = useCallback(async (d: Design) => {
+    if (designs.length <= 1) { toast.error('Cannot delete the only canvas'); return }
+    if (!window.confirm(`Delete canvas "${d.name}"? Its nodes and links will be removed.`)) return
+    try {
+      await designsApi.delete(d.id)
+      removeDesign(d.id)
+      toast.success('Canvas deleted')
+    } catch {
+      toast.error('Failed to delete canvas')
+    }
+  }, [designs.length, removeDesign])
 
   // forceView acts as a one-shot trigger from parent; user clicks afterwards still control view.
   if (forceView !== prevForceView) {
@@ -88,6 +123,75 @@ export function Sidebar({ onAddNode, onAddGroupRect, onAddText, onScan, onZigbee
         <Logo size={28} showText={!collapsed} />
       </div>
 
+      {/* Design Switcher */}
+      {!collapsed && designs.length > 0 && (
+        <div className="px-2 pt-2 pb-1 border-b border-border relative">
+          <button
+            onClick={() => setDesignSwitcherOpen((o) => !o)}
+            className="flex items-center gap-2 w-full px-2 py-1.5 rounded-md text-xs font-medium bg-[#21262d] border border-border hover:border-[#30363d] transition-colors cursor-pointer"
+          >
+            {activeDesignId ? (() => {
+              const active = designs.find((d) => d.id === activeDesignId)
+              const Icon = resolveDesignIcon(active?.icon)
+              return <><Icon size={14} className="shrink-0 text-[#00d4ff]" /><span className="truncate text-foreground">{active?.name ?? 'Select Canvas'}</span></>
+            })() : <span className="text-muted-foreground">Select Canvas</span>}
+          </button>
+          {designSwitcherOpen && (
+            <>
+              {/* Overlay to close */}
+              <div className="fixed inset-0 z-40" onClick={() => setDesignSwitcherOpen(false)} />
+              <div className="absolute left-2 right-2 top-full mt-1 z-50 bg-[#21262d] border border-border rounded-md shadow-xl overflow-hidden">
+                {designs.map((d) => {
+                  const Icon = resolveDesignIcon(d.icon)
+                  const isActive = d.id === activeDesignId
+                  return (
+                    <div
+                      key={d.id}
+                      className={`group flex items-center transition-colors ${
+                        isActive ? 'bg-[#00d4ff]/10 text-[#00d4ff]' : 'text-muted-foreground hover:bg-[#30363d]'
+                      }`}
+                    >
+                      <button
+                        onClick={() => { setActiveDesign(d.id); setDesignSwitcherOpen(false) }}
+                        className="flex items-center gap-2 flex-1 min-w-0 px-3 py-2 text-xs cursor-pointer hover:text-foreground"
+                      >
+                        <Icon size={14} className="shrink-0" />
+                        <span className="truncate">{d.name}</span>
+                      </button>
+                      <button
+                        aria-label={`Edit ${d.name}`}
+                        title="Edit canvas"
+                        onClick={() => { setDesignModal({ mode: 'edit', design: d }); setDesignSwitcherOpen(false) }}
+                        className="shrink-0 p-1.5 text-muted-foreground hover:text-foreground cursor-pointer opacity-0 group-hover:opacity-100 transition-opacity"
+                      >
+                        <Pencil size={12} />
+                      </button>
+                      <button
+                        aria-label={`Delete ${d.name}`}
+                        title="Delete canvas"
+                        disabled={designs.length <= 1}
+                        onClick={() => handleDesignDelete(d)}
+                        className="shrink-0 p-1.5 pr-2 text-muted-foreground hover:text-[#f85149] cursor-pointer opacity-0 group-hover:opacity-100 transition-opacity disabled:opacity-0"
+                      >
+                        <Trash2 size={12} />
+                      </button>
+                    </div>
+                  )
+                })}
+                <div className="border-t border-border" />
+                <button
+                  onClick={() => { setDesignModal({ mode: 'create' }); setDesignSwitcherOpen(false) }}
+                  className="flex items-center gap-2 w-full px-3 py-2 text-xs text-[#00d4ff] hover:bg-[#00d4ff]/10 transition-colors cursor-pointer"
+                >
+                  <PlusCircle size={14} />
+                  <span>New Canvas</span>
+                </button>
+              </div>
+            </>
+          )}
+        </div>
+      )}
+
       {/* Views */}
       <nav className="flex flex-col gap-0.5 p-2">
         <SidebarItem
@@ -190,6 +294,18 @@ export function Sidebar({ onAddNode, onAddGroupRect, onAddText, onScan, onZigbee
       </div>
 
       {!collapsed && <VersionBadge />}
+
+      <DesignModal
+        key={designModal?.mode === 'edit' ? designModal.design?.id : 'create'}
+        open={!!designModal}
+        onClose={() => setDesignModal(null)}
+        onSubmit={handleDesignSubmit}
+        initial={designModal?.mode === 'edit' && designModal.design
+          ? { name: designModal.design.name, icon: designModal.design.icon ?? DEFAULT_DESIGN_ICON }
+          : undefined}
+        title={designModal?.mode === 'edit' ? 'Edit Canvas' : 'New Canvas'}
+        submitLabel={designModal?.mode === 'edit' ? 'Save' : 'Create'}
+      />
     </aside>
   )
 }

frontend/src/stores/__tests__/designStore.test.ts

@@ -0,0 +1,131 @@
+import { describe, it, expect, beforeEach } from 'vitest'
+import { useDesignStore } from '@/stores/designStore'
+import type { Design } from '@/types'
+
+function design(id: string, type: Design['design_type'] = 'network', name = id): Design {
+  return { id, name, design_type: type, created_at: '', updated_at: '' }
+}
+
+describe('designStore', () => {
+  beforeEach(() => {
+    useDesignStore.setState({ designs: [], activeDesignId: null, activeDesignType: null, loaded: false })
+  })
+
+  it('starts empty and not loaded', () => {
+    const s = useDesignStore.getState()
+    expect(s.designs).toEqual([])
+    expect(s.activeDesignId).toBeNull()
+    expect(s.activeDesignType).toBeNull()
+    expect(s.loaded).toBe(false)
+  })
+
+  it('setDesigns selects the first design as active and marks loaded', () => {
+    const a = design('a', 'network')
+    const b = design('b', 'electrical')
+    useDesignStore.getState().setDesigns([a, b])
+    const s = useDesignStore.getState()
+    expect(s.designs).toHaveLength(2)
+    expect(s.activeDesignId).toBe('a')
+    expect(s.activeDesignType).toBe('network')
+    expect(s.loaded).toBe(true)
+  })
+
+  it('setDesigns preserves the active design when it is still present', () => {
+    useDesignStore.getState().setDesigns([design('a'), design('b', 'electrical')])
+    useDesignStore.getState().setActiveDesign('b')
+    // Re-list (e.g. after creating another design) — active id must not jump back to first.
+    useDesignStore.getState().setDesigns([design('a'), design('b', 'electrical'), design('c')])
+    const s = useDesignStore.getState()
+    expect(s.activeDesignId).toBe('b')
+    expect(s.activeDesignType).toBe('electrical')
+  })
+
+  it('setDesigns falls back to first when the active design was removed', () => {
+    useDesignStore.getState().setDesigns([design('a'), design('b', 'electrical')])
+    useDesignStore.getState().setActiveDesign('b')
+    useDesignStore.getState().setDesigns([design('a')]) // 'b' deleted
+    const s = useDesignStore.getState()
+    expect(s.activeDesignId).toBe('a')
+    expect(s.activeDesignType).toBe('network')
+  })
+
+  it('setDesigns with an empty list clears the active selection', () => {
+    useDesignStore.getState().setDesigns([design('a')])
+    useDesignStore.getState().setDesigns([])
+    const s = useDesignStore.getState()
+    expect(s.activeDesignId).toBeNull()
+    expect(s.activeDesignType).toBeNull()
+    expect(s.loaded).toBe(true)
+  })
+
+  it('setActiveDesign updates id and resolves type', () => {
+    useDesignStore.getState().setDesigns([design('a'), design('b', 'electrical')])
+    useDesignStore.getState().setActiveDesign('b')
+    const s = useDesignStore.getState()
+    expect(s.activeDesignId).toBe('b')
+    expect(s.activeDesignType).toBe('electrical')
+  })
+
+  it('setActiveDesign with an unknown id sets a null type', () => {
+    useDesignStore.getState().setDesigns([design('a')])
+    useDesignStore.getState().setActiveDesign('missing')
+    const s = useDesignStore.getState()
+    expect(s.activeDesignId).toBe('missing')
+    expect(s.activeDesignType).toBeNull()
+  })
+
+  it('getActiveDesign returns the active design or null', () => {
+    expect(useDesignStore.getState().getActiveDesign()).toBeNull()
+    const b = design('b', 'electrical')
+    useDesignStore.getState().setDesigns([design('a'), b])
+    useDesignStore.getState().setActiveDesign('b')
+    expect(useDesignStore.getState().getActiveDesign()).toEqual(b)
+  })
+
+  it('addDesign appends and makes the new design active', () => {
+    useDesignStore.getState().setDesigns([design('a')])
+    const b = design('b', 'electrical', 'Power')
+    useDesignStore.getState().addDesign(b)
+    const s = useDesignStore.getState()
+    expect(s.designs.map((d) => d.id)).toEqual(['a', 'b'])
+    expect(s.activeDesignId).toBe('b')
+    expect(s.activeDesignType).toBe('electrical')
+  })
+
+  it('updateDesign patches name and icon in place without touching others', () => {
+    useDesignStore.getState().setDesigns([design('a'), design('b')])
+    useDesignStore.getState().updateDesign('a', { name: 'Renamed', icon: 'server' })
+    const designs = useDesignStore.getState().designs
+    expect(designs.find((d) => d.id === 'a')).toMatchObject({ name: 'Renamed', icon: 'server' })
+    expect(designs.find((d) => d.id === 'b')!.name).toBe('b')
+  })
+
+  it('removeDesign drops a non-active design and keeps the active one', () => {
+    useDesignStore.getState().setDesigns([design('a'), design('b')])
+    useDesignStore.getState().setActiveDesign('a')
+    useDesignStore.getState().removeDesign('b')
+    const s = useDesignStore.getState()
+    expect(s.designs.map((d) => d.id)).toEqual(['a'])
+    expect(s.activeDesignId).toBe('a')
+  })
+
+  it('removeDesign reassigns active to the first remaining when the active is removed', () => {
+    useDesignStore.getState().setDesigns([design('a'), design('b', 'electrical')])
+    useDesignStore.getState().setActiveDesign('a')
+    useDesignStore.getState().removeDesign('a')
+    const s = useDesignStore.getState()
+    expect(s.designs.map((d) => d.id)).toEqual(['b'])
+    expect(s.activeDesignId).toBe('b')
+    expect(s.activeDesignType).toBe('electrical')
+  })
+
+  it('removeDesign clears active when the last design is removed', () => {
+    useDesignStore.getState().setDesigns([design('a')])
+    useDesignStore.getState().setActiveDesign('a')
+    useDesignStore.getState().removeDesign('a')
+    const s = useDesignStore.getState()
+    expect(s.designs).toEqual([])
+    expect(s.activeDesignId).toBeNull()
+    expect(s.activeDesignType).toBeNull()
+  })
+})

frontend/src/stores/designStore.ts

@@ -0,0 +1,72 @@
+import { create } from 'zustand'
+import type { Design, DesignType } from '@/types'
+
+interface DesignState {
+  designs: Design[]
+  activeDesignId: string | null
+  activeDesignType: DesignType | null
+  loaded: boolean
+  setDesigns: (designs: Design[]) => void
+  setActiveDesign: (id: string) => void
+  getActiveDesign: () => Design | null
+  /** Append a new design and make it active. */
+  addDesign: (design: Design) => void
+  /** Patch an existing design in place (name/icon edits). */
+  updateDesign: (id: string, patch: Partial<Pick<Design, 'name' | 'icon'>>) => void
+  /** Remove a design; if it was active, fall back to the first remaining one. */
+  removeDesign: (id: string) => void
+}
+
+export const useDesignStore = create<DesignState>((set, get) => ({
+  designs: [],
+  activeDesignId: null,
+  activeDesignType: null,
+  loaded: false,
+
+  setDesigns: (designs) =>
+    set((state) => {
+      const nextId = state.activeDesignId && designs.find((d) => d.id === state.activeDesignId)
+        ? state.activeDesignId
+        : designs[0]?.id ?? null
+      const nextType = nextId ? designs.find((d) => d.id === nextId)?.design_type ?? null : null
+      return { designs, activeDesignId: nextId, activeDesignType: nextType, loaded: true }
+    }),
+
+  setActiveDesign: (id) =>
+    set((state) => {
+      const design = state.designs.find((d) => d.id === id)
+      return {
+        activeDesignId: id,
+        activeDesignType: design?.design_type ?? null,
+      }
+    }),
+
+  getActiveDesign: () => {
+    const { designs, activeDesignId } = get()
+    return designs.find((d) => d.id === activeDesignId) ?? null
+  },
+
+  addDesign: (design) =>
+    set((state) => ({
+      designs: [...state.designs, design],
+      activeDesignId: design.id,
+      activeDesignType: design.design_type,
+    })),
+
+  updateDesign: (id, patch) =>
+    set((state) => ({
+      designs: state.designs.map((d) => (d.id === id ? { ...d, ...patch } : d)),
+    })),
+
+  removeDesign: (id) =>
+    set((state) => {
+      const designs = state.designs.filter((d) => d.id !== id)
+      if (state.activeDesignId !== id) return { designs }
+      const next = designs[0] ?? null
+      return {
+        designs,
+        activeDesignId: next?.id ?? null,
+        activeDesignType: next?.design_type ?? null,
+      }
+    }),
+}))

frontend/src/types/__tests__/types.test.ts

@@ -28,7 +28,7 @@ describe('STATUS_COLORS', () => {
 
 describe('EDGE_TYPE_LABELS', () => {
   it('has an entry for every edge type', () => {
-    const expectedTypes = ['ethernet', 'wifi', 'iot', 'vlan', 'virtual', 'cluster']
+    const expectedTypes = ['ethernet', 'wifi', 'iot', 'vlan', 'virtual', 'cluster', 'fibre']
     expectedTypes.forEach((t) => {
       expect(EDGE_TYPE_LABELS).toHaveProperty(t)
     })

frontend/src/types/index.ts

@@ -1,3 +1,15 @@
+export type DesignType = 'network' | 'electrical'
+
+export interface Design {
+  id: string
+  name: string
+  design_type: DesignType
+  /** Lucide icon key (see utils/designIcons). User-chosen; may be null on legacy rows. */
+  icon?: string | null
+  created_at: string
+  updated_at: string
+}
+
 export type NodeType =
   | 'isp'
   | 'router'
@@ -25,6 +37,20 @@ export type NodeType =
   | 'zigbee_coordinator'
   | 'zigbee_router'
   | 'zigbee_enddevice'
+  | 'grid'
+  | 'ups'
+  | 'battery'
+  | 'generator'
+  | 'solar_panel'
+  | 'inverter'
+  | 'circuit_breaker'
+  | 'contactor'
+  | 'electrical_switch'
+  | 'socket'
+  | 'light'
+  | 'meter'
+  | 'transformer'
+  | 'load'
 
 export type TextPosition =
   | 'top-left'
@@ -37,7 +63,7 @@ export type TextPosition =
   | 'bottom-center'
   | 'bottom-right'
 
-export type EdgeType = 'ethernet' | 'wifi' | 'iot' | 'vlan' | 'virtual' | 'cluster'
+export type EdgeType = 'ethernet' | 'wifi' | 'iot' | 'vlan' | 'virtual' | 'cluster' | 'fibre' | 'electrical'
 
 export type NodeStatus = 'online' | 'offline' | 'pending' | 'unknown'
 
@@ -106,8 +132,10 @@ export interface NodeData extends Record<string, unknown> {
    */
   collapsed?: boolean
   custom_icon?: string
-  /** Number of bottom connection points, 1..48. Default 1 (centered). */
+  /** Number of bottom connection points, 1..64. Default 1 (centered). */
   bottom_handles?: number
+  /** Show a port number (1..N) above each bottom connection point. */
+  show_port_numbers?: boolean
   /** Text node content (type === 'text') */
   text_content?: string
 }
@@ -157,6 +185,20 @@ export const NODE_TYPE_LABELS: Record<NodeType, string> = {
   zigbee_coordinator: 'Zigbee Coordinator',
   zigbee_router: 'Zigbee Router',
   zigbee_enddevice: 'Zigbee End Device',
+  grid: 'Grid Connection',
+  ups: 'UPS',
+  battery: 'Battery',
+  generator: 'Generator',
+  solar_panel: 'Solar Panel',
+  inverter: 'Inverter',
+  circuit_breaker: 'Circuit Breaker',
+  contactor: 'Contactor',
+  electrical_switch: 'Switch',
+  socket: 'Socket / Outlet',
+  light: 'Light Fixture',
+  meter: 'Energy Meter',
+  transformer: 'Transformer',
+  load: 'Electrical Load',
 }
 
 export const STATUS_COLORS: Record<NodeStatus, string> = {
@@ -173,6 +215,8 @@ export const EDGE_TYPE_LABELS: Record<EdgeType, string> = {
   vlan: 'VLAN',
   virtual: 'Virtual',
   cluster: 'Cluster',
+  fibre: 'Fibre',
+  electrical: 'Electrical Wire',
 }
 
 export interface NodeTypeStyle {

frontend/src/utils/__tests__/designIcons.test.ts

@@ -0,0 +1,27 @@
+import { describe, it, expect } from 'vitest'
+import { DESIGN_ICONS, DEFAULT_DESIGN_ICON, resolveDesignIcon } from '@/utils/designIcons'
+
+describe('designIcons', () => {
+  it('exposes a non-empty, unique-keyed icon set', () => {
+    expect(DESIGN_ICONS.length).toBeGreaterThan(0)
+    const keys = DESIGN_ICONS.map((e) => e.key)
+    expect(new Set(keys).size).toBe(keys.length)
+  })
+
+  it('default icon key is part of the set', () => {
+    expect(DESIGN_ICONS.some((e) => e.key === DEFAULT_DESIGN_ICON)).toBe(true)
+  })
+
+  it('resolveDesignIcon returns the matching component for a known key', () => {
+    const entry = DESIGN_ICONS.find((e) => e.key === 'zap')!
+    expect(resolveDesignIcon('zap')).toBe(entry.icon)
+  })
+
+  it('resolveDesignIcon falls back to a component for unknown/empty keys', () => {
+    const fallback = resolveDesignIcon(undefined)
+    expect(typeof fallback).toBe('object')
+    expect(resolveDesignIcon('does-not-exist')).toBe(fallback)
+    expect(resolveDesignIcon(null)).toBe(fallback)
+    expect(resolveDesignIcon('')).toBe(fallback)
+  })
+})

frontend/src/utils/__tests__/edgeColors.test.ts

@@ -2,7 +2,7 @@ import { describe, it, expect } from 'vitest'
 import { EDGE_DEFAULT_COLORS } from '../edgeColors'
 import type { EdgeType } from '@/types'
 
-const EDGE_TYPES: EdgeType[] = ['ethernet', 'wifi', 'iot', 'vlan', 'virtual', 'cluster']
+const EDGE_TYPES: EdgeType[] = ['ethernet', 'wifi', 'iot', 'vlan', 'virtual', 'cluster', 'fibre']
 
 describe('EDGE_DEFAULT_COLORS', () => {
   it('has an entry for every EdgeType', () => {
@@ -36,4 +36,8 @@ describe('EDGE_DEFAULT_COLORS', () => {
   it('cluster default is proxmox orange', () => {
     expect(EDGE_DEFAULT_COLORS.cluster).toBe('#ff6e00')
   })
+
+  it('fibre default is bright cyan', () => {
+    expect(EDGE_DEFAULT_COLORS.fibre).toBe('#22d3ee')
+  })
 })

frontend/src/utils/__tests__/exportYaml.test.ts

@@ -102,6 +102,15 @@ describe('exportCanvasToYaml', () => {
     expect(entryA).not.toHaveProperty('clusterR')
   })
 
+  it('serializes a fibre edge with linkType "fibre" (issue #21)', () => {
+    const nodeA = makeNode({ label: 'Switch', type: 'switch' }, 'sw')
+    const nodeB = makeNode({ label: 'Server1', type: 'server' }, 's1')
+    const edge = makeEdge('e1', 'sw', 's1', { type: 'fibre', label: 'sfp0' })
+    const result = yaml.load(exportCanvasToYaml([nodeA, nodeB], [edge])) as Record<string, unknown>[]
+    const entryA = result.find((e) => e.label === 'Switch')!
+    expect(entryA.links).toEqual([{ label: 'Server1', linkType: 'fibre', linkLabel: 'sfp0' }])
+  })
+
   it('serializes multiple outgoing edges as links array', () => {
     const sw = makeNode({ label: 'Switch', type: 'switch' }, 'sw')
     const s1 = makeNode({ label: 'Server1', type: 'server' }, 's1')

frontend/src/utils/__tests__/handleUtils.test.ts

@@ -29,8 +29,12 @@ describe('clampBottomHandles', () => {
     expect(clampBottomHandles(-5)).toBe(MIN_BOTTOM_HANDLES)
   })
 
+  it('supports at least 52 ports (issue #20 — Cisco 48+4 SFP)', () => {
+    expect(MAX_BOTTOM_HANDLES).toBeGreaterThanOrEqual(52)
+  })
+
   it('clamps above MAX to MAX', () => {
-    expect(clampBottomHandles(49)).toBe(MAX_BOTTOM_HANDLES)
+    expect(clampBottomHandles(65)).toBe(MAX_BOTTOM_HANDLES)
     expect(clampBottomHandles(9999)).toBe(MAX_BOTTOM_HANDLES)
   })
 
@@ -49,6 +53,8 @@ describe('clampBottomHandles', () => {
     expect(clampBottomHandles(1)).toBe(1)
     expect(clampBottomHandles(24)).toBe(24)
     expect(clampBottomHandles(48)).toBe(48)
+    expect(clampBottomHandles(52)).toBe(52)
+    expect(clampBottomHandles(64)).toBe(64)
   })
 })
 

frontend/src/utils/__tests__/importYaml.test.ts

@@ -89,6 +89,22 @@ describe('parseYamlToCanvas', () => {
     expect(edges[0].targetHandle).toBe('top-t')
   })
 
+  it('imports a fibre link type onto the edge (issue #21)', () => {
+    const yaml = `
+- nodeType: switch
+  label: "SW"
+  links:
+    - label: "SRV"
+      linkType: fibre
+- nodeType: server
+  label: "SRV"
+`
+    const { edges } = parseYamlToCanvas(yaml, empty, emptyEdges)
+    expect(edges).toHaveLength(1)
+    expect(edges[0].type).toBe('fibre')
+    expect(edges[0].data?.type).toBe('fibre')
+  })
+
   it('cluster edges have cluster-right→cluster-left handles', () => {
     const yaml = `
 - nodeType: proxmox

frontend/src/utils/__tests__/themes.test.ts

@@ -6,7 +6,7 @@ const NODE_TYPES: NodeType[] = [
   'isp', 'router', 'firewall', 'switch', 'server', 'proxmox', 'vm', 'lxc',
   'nas', 'iot', 'ap', 'camera', 'printer', 'computer', 'laptop', 'mobile', 'cpl', 'docker_host', 'docker_container', 'generic', 'groupRect',
 ]
-const EDGE_TYPES: EdgeType[] = ['ethernet', 'wifi', 'iot', 'vlan', 'virtual', 'cluster']
+const EDGE_TYPES: EdgeType[] = ['ethernet', 'wifi', 'iot', 'vlan', 'virtual', 'cluster', 'fibre']
 const STATUS_TYPES: NodeStatus[] = ['online', 'offline', 'pending', 'unknown']
 
 describe('THEME_ORDER', () => {

frontend/src/utils/canvasSerializer.ts

@@ -32,6 +32,7 @@ export interface ApiNode extends Record<string, unknown> {
   width?: number | null
   height?: number | null
   bottom_handles?: number
+  show_port_numbers?: boolean
 }
 
 export interface ApiEdge {
@@ -114,6 +115,7 @@ export function serializeNode(n: Node<NodeData>): Record<string, unknown> {
     width: n.measured?.width ?? n.width ?? null,
     height: n.measured?.height ?? n.height ?? null,
     bottom_handles: clampBottomHandles(n.data.bottom_handles ?? 1),
+    show_port_numbers: n.data.show_port_numbers ?? false,
     pos_x: n.position.x,
     pos_y: n.position.y,
   }

frontend/src/utils/designIcons.ts

@@ -0,0 +1,44 @@
+import {
+  LayoutDashboard, Zap, Network, Server, HardDrive, Cpu, Wifi, Router,
+  Database, Cloud, Home, Globe, Lightbulb, Factory, Plug, Boxes,
+} from 'lucide-react'
+import type { LucideIcon } from 'lucide-react'
+
+export interface DesignIconEntry {
+  key: string
+  label: string
+  icon: LucideIcon
+}
+
+/** Curated icon set offered when creating/editing a canvas design. Keys are
+ *  stable strings persisted on `Design.icon`. */
+export const DESIGN_ICONS: DesignIconEntry[] = [
+  { key: 'dashboard', label: 'Dashboard', icon: LayoutDashboard },
+  { key: 'network', label: 'Network', icon: Network },
+  { key: 'zap', label: 'Electrical', icon: Zap },
+  { key: 'server', label: 'Server', icon: Server },
+  { key: 'harddrive', label: 'Storage', icon: HardDrive },
+  { key: 'cpu', label: 'Compute', icon: Cpu },
+  { key: 'wifi', label: 'Wireless', icon: Wifi },
+  { key: 'router', label: 'Router', icon: Router },
+  { key: 'database', label: 'Database', icon: Database },
+  { key: 'cloud', label: 'Cloud', icon: Cloud },
+  { key: 'home', label: 'Home', icon: Home },
+  { key: 'globe', label: 'Internet', icon: Globe },
+  { key: 'lightbulb', label: 'Lighting', icon: Lightbulb },
+  { key: 'factory', label: 'Industrial', icon: Factory },
+  { key: 'plug', label: 'Power', icon: Plug },
+  { key: 'boxes', label: 'Cluster', icon: Boxes },
+]
+
+export const DEFAULT_DESIGN_ICON = 'dashboard'
+
+const ICON_MAP: Record<string, LucideIcon> = Object.fromEntries(
+  DESIGN_ICONS.map((e) => [e.key, e.icon]),
+)
+
+/** Resolve a persisted design icon key to a lucide component. Unknown/empty
+ *  keys fall back to the dashboard icon so the UI never breaks on legacy data. */
+export function resolveDesignIcon(key?: string | null): LucideIcon {
+  return (key && ICON_MAP[key]) || LayoutDashboard
+}

frontend/src/utils/edgeColors.ts

@@ -7,4 +7,6 @@ export const EDGE_DEFAULT_COLORS: Record<EdgeType, string> = {
   vlan: '#00d4ff',
   virtual: '#8b949e',
   cluster: '#ff6e00',
+  fibre: '#22d3ee',
+  electrical: '#e3b341',
 }

frontend/src/utils/handleUtils.ts

@@ -2,14 +2,14 @@
  * Bottom handle configuration for multi-handle nodes.
  *
  * Handle IDs:  index 0 = 'bottom' (always the default, backward-compatible)
- *              index N≥1 = 'bottom-${N+1}'  (so idx 1 = 'bottom-2', idx 47 = 'bottom-48')
+ *              index N≥1 = 'bottom-${N+1}'  (so idx 1 = 'bottom-2', idx 63 = 'bottom-64')
  *
  * Invisible target handles follow the same pattern with a '-t' suffix:
- *   'bottom-t', 'bottom-2-t', ..., 'bottom-48-t'
+ *   'bottom-t', 'bottom-2-t', ..., 'bottom-64-t'
  */
 
 export const MIN_BOTTOM_HANDLES = 1
-export const MAX_BOTTOM_HANDLES = 48
+export const MAX_BOTTOM_HANDLES = 64
 
 /** Returns the source handle ID at a given slot index. */
 export function bottomHandleId(idx: number): string {

frontend/src/utils/nodeIcons.ts

@@ -25,6 +25,8 @@ import {
   Mail, MessageSquare, Phone,
   // Misc devices
   Printer, Smartphone, Laptop, Search, Filter, BookOpen, PlugZap, Type,
+  // Electrical
+  ToggleLeft,
 } from 'lucide-react'
 import type { LucideIcon } from 'lucide-react'
 
@@ -180,6 +182,20 @@ export const NODE_TYPE_DEFAULT_ICONS: Record<NodeType, LucideIcon> = {
   group:             Circle,
   groupRect:         Circle,
   text:              Type,
+  grid:              Zap,
+  ups:               Power,
+  battery:           BatteryCharging,
+  generator:         Fan,
+  solar_panel:       Sun,
+  inverter:          Workflow,
+  circuit_breaker:   PlugZap,
+  contactor:         ToggleLeft,
+  electrical_switch: ToggleLeft,
+  socket:            Plug,
+  light:             Lightbulb,
+  meter:             Gauge,
+  transformer:       CircleDot,
+  load:              Circle,
 }
 
 /** Resolve the display icon for a node — custom_icon takes priority over type default.

frontend/src/utils/themes.ts

@@ -68,6 +68,20 @@ export const THEMES: Record<ThemeId, ThemePreset> = {
         groupRect:         { border: '#00d4ff', icon: '#00d4ff' },
         group:             { border: '#00d4ff', icon: '#00d4ff' },
         text:              { border: '#30363d', icon: '#e6edf3' },
+        grid:              { border: '#ff6e00', icon: '#ff6e00' },
+        ups:               { border: '#39d353', icon: '#39d353' },
+        battery:           { border: '#39d353', icon: '#39d353' },
+        generator:         { border: '#e3b341', icon: '#e3b341' },
+        solar_panel:       { border: '#e3b341', icon: '#e3b341' },
+        inverter:          { border: '#a855f7', icon: '#a855f7' },
+        circuit_breaker:   { border: '#f85149', icon: '#f85149' },
+        contactor:         { border: '#f85149', icon: '#f85149' },
+        electrical_switch: { border: '#00d4ff', icon: '#00d4ff' },
+        socket:            { border: '#8b949e', icon: '#8b949e' },
+        light:             { border: '#e3b341', icon: '#e3b341' },
+        meter:             { border: '#00d4ff', icon: '#00d4ff' },
+        transformer:       { border: '#a855f7', icon: '#a855f7' },
+        load:              { border: '#ec4899', icon: '#ec4899' },
       },
       nodeCardBackground: '#21262d',
       nodeIconBackground: '#161b22',
@@ -86,6 +100,8 @@ export const THEMES: Record<ThemeId, ThemePreset> = {
         vlan:     '#00d4ff',
         virtual:  '#8b949e',
         cluster:  '#ff6e00',
+        fibre:    '#22d3ee',
+        electrical:'#e3b341',
       },
       edgeSelectedColor:  '#00d4ff',
       edgeLabelBackground:'#161b22',
@@ -131,6 +147,20 @@ export const THEMES: Record<ThemeId, ThemePreset> = {
         groupRect:         { border: '#22d3ee', icon: '#22d3ee' },
         group:             { border: '#22d3ee', icon: '#22d3ee' },
         text:              { border: '#404040', icon: '#ffffff' },
+        grid:              { border: '#ff6e00', icon: '#ff6e00' },
+        ups:               { border: '#39d353', icon: '#39d353' },
+        battery:           { border: '#39d353', icon: '#39d353' },
+        generator:         { border: '#e3b341', icon: '#e3b341' },
+        solar_panel:       { border: '#e3b341', icon: '#e3b341' },
+        inverter:          { border: '#a855f7', icon: '#a855f7' },
+        circuit_breaker:   { border: '#f85149', icon: '#f85149' },
+        contactor:         { border: '#f85149', icon: '#f85149' },
+        electrical_switch: { border: '#00d4ff', icon: '#00d4ff' },
+        socket:            { border: '#8b949e', icon: '#8b949e' },
+        light:             { border: '#e3b341', icon: '#e3b341' },
+        meter:             { border: '#00d4ff', icon: '#00d4ff' },
+        transformer:       { border: '#a855f7', icon: '#a855f7' },
+        load:              { border: '#ec4899', icon: '#ec4899' },
       },
       nodeCardBackground: '#0a0a0a',
       nodeIconBackground: '#111111',
@@ -149,15 +179,17 @@ export const THEMES: Record<ThemeId, ThemePreset> = {
         vlan:     '#22d3ee',
         virtual:  '#6b7280',
         cluster:  '#fb923c',
+        fibre:    '#06b6d4',
+        electrical:'#e3b341',
       },
       edgeSelectedColor:  '#22d3ee',
-      edgeLabelBackground:'#111111',
+      edgeLabelBackground:'#161b22',
-      edgeLabelColor:     '#666666',
+      edgeLabelColor:     '#9ca3af',
-      edgeLabelBorder:    '#1c1c1e',
+      edgeLabelBorder:    '#374151',
-      canvasBackground:   '#000000',
+      canvasBackground:   '#030712',
-      canvasDotColor:     '#1a1a1a',
+      canvasDotColor:     '#374151',
-      handleBackground:   '#1c1c1e',
+      handleBackground:   '#374151',
-      handleBorder:       '#444444',
+      handleBorder:       '#9ca3af',
       reactFlowColorMode: 'dark',
     },
   },
@@ -194,6 +226,20 @@ export const THEMES: Record<ThemeId, ThemePreset> = {
         groupRect:         { border: '#0284c7', icon: '#0284c7' },
         group:             { border: '#0284c7', icon: '#0284c7' },
         text:              { border: '#cbd5e1', icon: '#1f2328' },
+        grid:              { border: '#ff6e00', icon: '#ff6e00' },
+        ups:               { border: '#39d353', icon: '#39d353' },
+        battery:           { border: '#39d353', icon: '#39d353' },
+        generator:         { border: '#e3b341', icon: '#e3b341' },
+        solar_panel:       { border: '#e3b341', icon: '#e3b341' },
+        inverter:          { border: '#a855f7', icon: '#a855f7' },
+        circuit_breaker:   { border: '#f85149', icon: '#f85149' },
+        contactor:         { border: '#f85149', icon: '#f85149' },
+        electrical_switch: { border: '#00d4ff', icon: '#00d4ff' },
+        socket:            { border: '#8b949e', icon: '#8b949e' },
+        light:             { border: '#e3b341', icon: '#e3b341' },
+        meter:             { border: '#00d4ff', icon: '#00d4ff' },
+        transformer:       { border: '#a855f7', icon: '#a855f7' },
+        load:              { border: '#ec4899', icon: '#ec4899' },
       },
       nodeCardBackground: '#ffffff',
       nodeIconBackground: '#f0f6ff',
@@ -212,15 +258,17 @@ export const THEMES: Record<ThemeId, ThemePreset> = {
         vlan:     '#0284c7',
         virtual:  '#9ca3af',
         cluster:  '#ea580c',
+        fibre:    '#0891b2',
+        electrical:'#d97706',
       },
       edgeSelectedColor:  '#0284c7',
       edgeLabelBackground:'#ffffff',
-      edgeLabelColor:     '#57606a',
+      edgeLabelColor:     '#6b7280',
       edgeLabelBorder:    '#d0d7de',
       canvasBackground:   '#f6f8fa',
       canvasDotColor:     '#d0d7de',
       handleBackground:   '#d0d7de',
-      handleBorder:       '#9ca3af',
+      handleBorder:       '#6b7280',
       reactFlowColorMode: 'light',
     },
   },
@@ -257,6 +305,20 @@ export const THEMES: Record<ThemeId, ThemePreset> = {
         groupRect:         { border: '#00ffff', icon: '#00ffff' },
         group:             { border: '#00ffff', icon: '#00ffff' },
         text:              { border: '#3a3a6a', icon: '#ffffff' },
+        grid:              { border: '#ff6e00', icon: '#ff6e00' },
+        ups:               { border: '#39d353', icon: '#39d353' },
+        battery:           { border: '#39d353', icon: '#39d353' },
+        generator:         { border: '#e3b341', icon: '#e3b341' },
+        solar_panel:       { border: '#e3b341', icon: '#e3b341' },
+        inverter:          { border: '#a855f7', icon: '#a855f7' },
+        circuit_breaker:   { border: '#f85149', icon: '#f85149' },
+        contactor:         { border: '#f85149', icon: '#f85149' },
+        electrical_switch: { border: '#00d4ff', icon: '#00d4ff' },
+        socket:            { border: '#8b949e', icon: '#8b949e' },
+        light:             { border: '#e3b341', icon: '#e3b341' },
+        meter:             { border: '#00d4ff', icon: '#00d4ff' },
+        transformer:       { border: '#a855f7', icon: '#a855f7' },
+        load:              { border: '#ec4899', icon: '#ec4899' },
       },
       nodeCardBackground: '#0f0f2a',
       nodeIconBackground: '#0a0a1a',
@@ -275,6 +337,8 @@ export const THEMES: Record<ThemeId, ThemePreset> = {
         vlan:     '#00ffff',
         virtual:  '#8888cc',
         cluster:  '#ff8800',
+        fibre:    '#00e5ff',
+        electrical:'#ffff00',
       },
       edgeSelectedColor:  '#00ffff',
       edgeLabelBackground:'#0a0a1a',
@@ -320,6 +384,20 @@ export const THEMES: Record<ThemeId, ThemePreset> = {
         groupRect:         { border: '#00ff41', icon: '#00ff41' },
         group:             { border: '#00ff41', icon: '#00ff41' },
         text:              { border: '#003311', icon: '#00ff41' },
+        grid:              { border: '#cc6600', icon: '#cc6600' },
+        ups:               { border: '#00ff41', icon: '#00ff41' },
+        battery:           { border: '#00ff41', icon: '#00ff41' },
+        generator:         { border: '#ffcc00', icon: '#ffcc00' },
+        solar_panel:       { border: '#ffcc00', icon: '#ffcc00' },
+        inverter:          { border: '#aa00ff', icon: '#aa00ff' },
+        circuit_breaker:   { border: '#ff0033', icon: '#ff0033' },
+        contactor:         { border: '#ff0033', icon: '#ff0033' },
+        electrical_switch: { border: '#00d4ff', icon: '#00d4ff' },
+        socket:            { border: '#005500', icon: '#005500' },
+        light:             { border: '#ffcc00', icon: '#ffcc00' },
+        meter:             { border: '#00d4ff', icon: '#00d4ff' },
+        transformer:       { border: '#aa00ff', icon: '#aa00ff' },
+        load:              { border: '#ff69b4', icon: '#ff69b4' },
       },
       nodeCardBackground: '#001100',
       nodeIconBackground: '#002200',
@@ -338,6 +416,8 @@ export const THEMES: Record<ThemeId, ThemePreset> = {
         vlan:     '#00cc33',
         virtual:  '#004400',
         cluster:  '#33ff66',
+        fibre:    '#00ffcc',
+        electrical:'#66ff33',
       },
       edgeSelectedColor:  '#00ff41',
       edgeLabelBackground:'#001100',
@@ -383,6 +463,20 @@ export const THEMES: Record<ThemeId, ThemePreset> = {
         groupRect:        { border: '#00d4ff', icon: '#00d4ff' },
         group:            { border: '#00d4ff', icon: '#00d4ff' },
         text:             { border: '#30363d', icon: '#e6edf3' },
+        grid:              { border: '#ff6e00', icon: '#ff6e00' },
+        ups:               { border: '#39d353', icon: '#39d353' },
+        battery:           { border: '#39d353', icon: '#39d353' },
+        generator:         { border: '#e3b341', icon: '#e3b341' },
+        solar_panel:       { border: '#e3b341', icon: '#e3b341' },
+        inverter:          { border: '#a855f7', icon: '#a855f7' },
+        circuit_breaker:   { border: '#f85149', icon: '#f85149' },
+        contactor:         { border: '#f85149', icon: '#f85149' },
+        electrical_switch: { border: '#00d4ff', icon: '#00d4ff' },
+        socket:            { border: '#8b949e', icon: '#8b949e' },
+        light:             { border: '#e3b341', icon: '#e3b341' },
+        meter:             { border: '#00d4ff', icon: '#00d4ff' },
+        transformer:       { border: '#a855f7', icon: '#a855f7' },
+        load:              { border: '#ec4899', icon: '#ec4899' },
       },
       nodeCardBackground: '#21262d',
       nodeIconBackground: '#161b22',
@@ -401,6 +495,8 @@ export const THEMES: Record<ThemeId, ThemePreset> = {
         vlan:     '#00d4ff',
         virtual:  '#8b949e',
         cluster:  '#ff6e00',
+        fibre:    '#22d3ee',
+        electrical: '#e3b341',
       },
       edgeSelectedColor:  '#00d4ff',
       edgeLabelBackground:'#161b22',