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backend/api/routes/network.py

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+from fastapi import APIRouter, Depends, Query
+from sqlalchemy import text
+from sqlalchemy.ext.asyncio import AsyncSession
+from core.database import get_session
+
+router = APIRouter()
+
+SWITCHES = {
+    "sg-01": [
+        {"switch_id": "sw-core-01", "name": "Core Switch — Hall A", "model": "Cisco Catalyst C9300-48P", "room_id": "hall-a", "rack_id": "SG1A01.01", "port_count": 48, "role": "core"},
+        {"switch_id": "sw-core-02", "name": "Core Switch — Hall B", "model": "Arista 7050CX3-32S",       "room_id": "hall-b", "rack_id": "SG1B01.01", "port_count": 32, "role": "core"},
+        {"switch_id": "sw-edge-01", "name": "Edge / Uplink Switch",  "model": "Juniper EX4300-48T",      "room_id": "hall-a", "rack_id": "SG1A01.05", "port_count": 48, "role": "edge"},
+    ]
+}
+
+NET_FIELD_MAP = {
+    "net_uptime_s":      "uptime_s",
+    "net_active_ports":  "active_ports",
+    "net_bw_in_mbps":    "bandwidth_in_mbps",
+    "net_bw_out_mbps":   "bandwidth_out_mbps",
+    "net_cpu_pct":       "cpu_pct",
+    "net_mem_pct":       "mem_pct",
+    "net_temp_c":        "temperature_c",
+    "net_pkt_loss_pct":  "packet_loss_pct",
+}
+
+STATE_MAP = {0.0: "up", 1.0: "degraded", 2.0: "down"}
+
+
+@router.get("/status")
+async def network_status(
+    site_id: str = Query(...),
+    session: AsyncSession = Depends(get_session),
+):
+    """Latest reading for each network switch."""
+    types_sql = ", ".join(f"'{t}'" for t in [*NET_FIELD_MAP.keys(), "net_state"])
+    result = await session.execute(text(f"""
+        SELECT DISTINCT ON (sensor_id)
+            sensor_id, sensor_type, value
+        FROM readings
+        WHERE site_id     = :site_id
+          AND sensor_type IN ({types_sql})
+          AND recorded_at > NOW() - INTERVAL '5 minutes'
+        ORDER BY sensor_id, recorded_at DESC
+    """), {"site_id": site_id})
+
+    sw_data: dict[str, dict] = {}
+    for row in result.mappings().all():
+        parts = row["sensor_id"].split("/")
+        if len(parts) < 3:
+            continue
+        sw_id = parts[2]
+        if sw_id not in sw_data:
+            sw_data[sw_id] = {}
+        field = NET_FIELD_MAP.get(row["sensor_type"])
+        if field:
+            sw_data[sw_id][field] = round(float(row["value"]), 2)
+        elif row["sensor_type"] == "net_state":
+            v = round(float(row["value"]))
+            sw_data[sw_id]["state"] = STATE_MAP.get(v, "unknown")
+
+    out = []
+    for sw_cfg in SWITCHES.get(site_id, []):
+        sw_id = sw_cfg["switch_id"]
+        d = {**sw_cfg, **sw_data.get(sw_id, {})}
+        if "state" not in d:
+            d["state"] = "unknown"
+        out.append(d)
+    return out