first commit

backend/api/routes/fire.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()
+
+VESDA_ZONES = {
+    "sg-01": [
+        {"zone_id": "vesda-hall-a", "room_id": "hall-a"},
+        {"zone_id": "vesda-hall-b", "room_id": "hall-b"},
+    ]
+}
+
+LEVEL_MAP = {0: "normal", 1: "alert", 2: "action", 3: "fire"}
+
+VESDA_TYPES = ("vesda_level", "vesda_obscuration", "vesda_det1", "vesda_det2",
+               "vesda_power", "vesda_flow")
+
+
+@router.get("/status")
+async def fire_status(
+    site_id: str = Query(...),
+    session: AsyncSession = Depends(get_session),
+):
+    """Latest VESDA readings per fire zone."""
+    types_sql = ", ".join(f"'{t}'" for t in VESDA_TYPES)
+    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 '2 minutes'
+        ORDER BY sensor_id, recorded_at DESC
+    """), {"site_id": site_id})
+
+    zone_data: dict[str, dict] = {}
+    for row in result.mappings().all():
+        parts = row["sensor_id"].split("/")
+        if len(parts) < 3:
+            continue
+        zone_id = parts[2]
+        if zone_id not in zone_data:
+            zone_data[zone_id] = {"zone_id": zone_id}
+        v = float(row["value"])
+        s_type = row["sensor_type"]
+        if s_type == "vesda_level":
+            zone_data[zone_id]["level"] = LEVEL_MAP.get(round(v), "normal")
+        elif s_type == "vesda_obscuration":
+            zone_data[zone_id]["obscuration_pct_m"] = round(v, 3)
+        elif s_type == "vesda_det1":
+            zone_data[zone_id]["detector_1_ok"] = v > 0.5
+        elif s_type == "vesda_det2":
+            zone_data[zone_id]["detector_2_ok"] = v > 0.5
+        elif s_type == "vesda_power":
+            zone_data[zone_id]["power_ok"] = v > 0.5
+        elif s_type == "vesda_flow":
+            zone_data[zone_id]["flow_ok"] = v > 0.5
+
+    zone_room_map = {z["zone_id"]: z["room_id"] for z in VESDA_ZONES.get(site_id, [])}
+
+    out = []
+    for zone_cfg in VESDA_ZONES.get(site_id, []):
+        zone_id = zone_cfg["zone_id"]
+        d = zone_data.get(zone_id, {"zone_id": zone_id})
+        d.setdefault("level", "normal")
+        d.setdefault("obscuration_pct_m", None)
+        d.setdefault("detector_1_ok", True)
+        d.setdefault("detector_2_ok", True)
+        d.setdefault("power_ok", True)
+        d.setdefault("flow_ok", True)
+        d["room_id"] = zone_room_map.get(zone_id)
+        out.append(d)
+    return out