Ajout du backend

backend/store_file.py

@@ -0,0 +1,31 @@
+import json
+import os
+import threading
+
+
+class FileStore:
+    def __init__(self, data_dir):
+        self.path = os.path.join(data_dir, "measures.json")
+        self._lock = threading.Lock()
+        os.makedirs(data_dir, exist_ok=True)
+        if not os.path.exists(self.path):
+            self._write([])
+
+    def _read(self):
+        with open(self.path, "r", encoding="utf-8") as f:
+            return json.load(f)
+
+    def _write(self, data):
+        with open(self.path, "w", encoding="utf-8") as f:
+            json.dump(data, f, ensure_ascii=False, indent=2)
+
+    def add_measure(self, measure):
+        with self._lock:
+            data = self._read()
+            data.append(measure)
+            self._write(data)
+
+    def list_measures(self, device_id, limit=50):
+        with self._lock:
+            data = self._read()
+        return [m for m in data if m["device_id"] == device_id][-limit:]