fix FE 96h forecast

backend/app/routers/sites.py

@@ -481,3 +481,44 @@ async def get_site_forecast_pv(
     if not isinstance(pv_b, list):
         pv_b = []
     return {"pv_a": pv_a, "pv_b": pv_b}
+
+
+@router.get("/{site_id}/forecast/pv-slots")
+async def get_site_forecast_pv_slots_range(
+    site_id: int,
+    db: Annotated[asyncpg.Pool, Depends(get_pg_pool)],
+    from_ts: datetime = Query(
+        ...,
+        alias="from",
+        description="Začátek okna [from, to), typicky UTC zaokrouhlené na 15 min",
+    ),
+    to_ts: datetime = Query(
+        ...,
+        alias="to",
+        description="Konec polouzavřeného intervalu (max. cca 120 h za from)",
+    ),
+) -> dict[str, list[dict[str, Any]]]:
+    if to_ts <= from_ts:
+        raise HTTPException(status_code=422, detail="'to' must be after 'from'")
+    if to_ts - from_ts > timedelta(hours=120):
+        raise HTTPException(
+            status_code=422,
+            detail="Span between 'from' and 'to' must be at most 120 hours",
+        )
+    async with db.acquire() as conn:
+        site_ok = await conn.fetchval(
+            "SELECT EXISTS(SELECT 1 FROM ems.site WHERE id = $1)", site_id
+        )
+        if not site_ok:
+            raise HTTPException(status_code=404, detail="Site not found")
+        raw = await fetch_json(
+            conn,
+            "select ems.fn_forecast_pv_slots_range($1::int, $2::timestamptz, $3::timestamptz)",
+            site_id,
+            from_ts,
+            to_ts,
+        )
+    slots = raw if isinstance(raw, list) else []
+    if not isinstance(slots, list):
+        slots = []
+    return {"slots": slots}