refacto: rename app into backend, to prepare for frontend dev

server/backend/adapters/postgres/device_repository.py

@@ -0,0 +1,30 @@
+import logging
+
+import psycopg2
+
+from ports import DeviceRepository
+from domain.exceptions import DatabaseError
+from infrastructure.db import get_conn
+
+log = logging.getLogger(__name__)
+
+
+class PgDeviceRepository(DeviceRepository):
+    def get_or_create_device_id(self, dev_eui: str) -> str:
+        try:
+            with get_conn() as conn:
+                with conn.cursor() as cur:
+                    cur.execute(
+                        """
+                        INSERT INTO device (device_eui)
+                        VALUES (%s)
+                        ON CONFLICT (device_eui) DO NOTHING
+                    """,
+                        (dev_eui,),
+                    )
+                    cur.execute(
+                        "SELECT device_id FROM device WHERE device_eui = %s", (dev_eui,)
+                    )
+                    return str(cur.fetchone()[0])  # type: ignore
+        except psycopg2.DatabaseError as e:
+            raise DatabaseError(f"Erreur de création du device {dev_eui}") from e