fires: append FIRMS day-range param; API 400s without it

FIRMS area-CSV requires an explicit [1..5] day range — requests without
it return 'Invalid day range. Expects [1..5].' as a 400. New
FIRMS_DAYS env (default 1).

app/config.py

@@ -54,5 +54,8 @@ FIRMS_DATASET = os.getenv("FIRMS_DATASET", "VIIRS_SNPP_NRT")
 FIRMS_BBOX = os.getenv("FIRMS_BBOX", "-180,-60,180,75")
 # Poll cadence in seconds. FIRMS NRT updates every ~5-10 min; 900 = 15 min.
 FIRMS_INTERVAL = int(os.getenv("FIRMS_INTERVAL", "900"))
+# Day range for the area-CSV request. FIRMS accepts [1..5] days of NRT
+# detections; the API 400s when this parameter is omitted.
+FIRMS_DAYS = int(os.getenv("FIRMS_DAYS", "1"))
 # Outbound HTTP timeout for the FIRMS CSV download.
 FIRMS_TIMEOUT = float(os.getenv("FIRMS_TIMEOUT", "60"))

app/fire_sources.py

@@ -31,7 +31,13 @@ from datetime import datetime, timezone
 import httpx
 import nats
 
-from config import FIRMS_DATASET, FIRMS_BBOX, FIRMS_TIMEOUT, NATS_URL
+from config import (
+    FIRMS_BBOX,
+    FIRMS_DATASET,
+    FIRMS_DAYS,
+    FIRMS_TIMEOUT,
+    NATS_URL,
+)
 from keystore import get_api_key
 
 logger = logging.getLogger("osint.firms")
@@ -39,7 +45,7 @@ logger = logging.getLogger("osint.firms")
 # ── FIRMS API ─────────────────────────────────────────────────────────────
 
 FIRMS_AREA_CSV = (
-    "https://firms.modaps.eosdis.nasa.gov/api/area/csv/{key}/{dataset}/{bbox}"
+    "https://firms.modaps.eosdis.nasa.gov/api/area/csv/{key}/{dataset}/{bbox}/{days}"
 )
 
 # The canonical VIIRS CSV header FIRMS returns. Used to (a) locate the real
@@ -175,7 +181,7 @@ async def ingest_fires(bbox: str | None = None) -> int:
 
     area = bbox or FIRMS_BBOX
     url = FIRMS_AREA_CSV.format(
-        key=map_key, dataset=FIRMS_DATASET, bbox=area
+        key=map_key, dataset=FIRMS_DATASET, bbox=area, days=FIRMS_DAYS
     )
 
     async with httpx.AsyncClient(timeout=FIRMS_TIMEOUT) as client: