first commit

backend/api/routes/leak.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()
+
+# Static topology metadata — mirrors simulator config
+LEAK_SENSORS = {
+    "sg-01": [
+        {"sensor_id": "leak-01", "floor_zone": "crac-zone-a",   "under_floor": True,  "near_crac": True,  "room_id": "hall-a"},
+        {"sensor_id": "leak-02", "floor_zone": "server-row-b1", "under_floor": True,  "near_crac": False, "room_id": "hall-b"},
+        {"sensor_id": "leak-03", "floor_zone": "ups-room",      "under_floor": False, "near_crac": False, "room_id": None},
+    ]
+}
+
+
+@router.get("/status")
+async def leak_status(
+    site_id: str = Query(...),
+    session: AsyncSession = Depends(get_session),
+):
+    """Latest state for all leak sensors, enriched with location metadata."""
+    result = await session.execute(text("""
+        SELECT DISTINCT ON (sensor_id)
+            sensor_id, value, recorded_at
+        FROM readings
+        WHERE site_id     = :site_id
+          AND sensor_type = 'leak'
+          AND recorded_at > NOW() - INTERVAL '5 minutes'
+        ORDER BY sensor_id, recorded_at DESC
+    """), {"site_id": site_id})
+
+    # sensor_id format: {site_id}/leak/{sensor_id}
+    state_map: dict[str, dict] = {}
+    for row in result.mappings().all():
+        parts = row["sensor_id"].split("/")
+        if len(parts) < 3:
+            continue
+        sid = parts[2]
+        state_map[sid] = {
+            "state":       "detected" if float(row["value"]) > 0.5 else "clear",
+            "recorded_at": str(row["recorded_at"]),
+        }
+
+    out = []
+    for cfg in LEAK_SENSORS.get(site_id, []):
+        sid = cfg["sensor_id"]
+        entry = {**cfg}
+        if sid in state_map:
+            entry["state"]       = state_map[sid]["state"]
+            entry["recorded_at"] = state_map[sid]["recorded_at"]
+        else:
+            entry["state"]       = "unknown"
+            entry["recorded_at"] = None
+        out.append(entry)
+    return out