Ajout du backend

backend/store_firestore.py

@@ -0,0 +1,18 @@
+class FirestoreStore:
+    def __init__(self, project_id, collection="measures"):
+        from google.cloud import firestore  # import tardif : optionnel
+
+        self.db = firestore.Client(project=project_id)
+        self.collection = collection
+
+    def add_measure(self, measure):
+        self.db.collection(self.collection).add(measure)
+
+    def list_measures(self, device_id, limit=50):
+        docs = (
+            self.db.collection(self.collection)
+            .where("device_id", "==", device_id)
+            .limit(limit)
+            .stream()
+        )
+        return [d.to_dict() for d in docs]