docs: add database entity relationship diagram (ERD.md)

docker-compose.override.yml

@@ -1,4 +1,11 @@
 services:
   backend:
-    devices:
-      - nvidia.com/gpu=all
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - driver: nvidia
+              count: all
+              capabilities: [ gpu ]
+    # devices:
+    #   - nvidia.com/gpu=all