diff --git a/flake.nix b/flake.nix
index 6f6c930..77161e2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -35,6 +35,18 @@
         diff-so-fancy
       ];
 
+      scripts = {
+        beste-schule-set-missing-grades = pkgs.writeShellApplication {
+          name = "set-missing-grades";
+          runtimeInputs = [
+            pkgs.coreutils
+            pkgs.jq
+            pkgs.curl
+          ];
+          text = builtins.readFile ./scripts/set-missing-grades.sh;
+        };
+      };
+
       shells = {
         nix = {
           name = "generic nix";
@@ -85,6 +97,12 @@
           name = "generic markdown";
           packages = [mdpls];
         };
+        "beste-schule" = {
+          name = "beste.schule";
+          packages = [
+            scripts.beste-schule-set-missing-grades
+          ] ++ shells.nodePhp.packages;
+        };
       };
     in {
       devShells = pkgs.lib.attrsets.mapAttrs (name: value:
diff --git a/scripts/set-missing-grades.sh b/scripts/set-missing-grades.sh
new file mode 100644
index 0000000..84bb40d
--- /dev/null
+++ b/scripts/set-missing-grades.sh
@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+#
+# Set all missing grades, specify query using the options below
+
+function print_help_and_exit() {
+  printf "Usage: set-missing-grades OPTIONS\n"
+  printf "\n"
+  printf "Options:\n"
+  printf "  -g, --group <group_id>\n"
+  printf "          Filter by group\n"
+  printf "  -s, --subject <subject_id>\n"
+  printf "          Filter by subject\n"
+  printf "  -i, --interval <interval_id>\n"
+  printf "          Filter by interval\n"
+  printf "  -t, --token <token>\n"
+  printf "          Token to use for requests\n"
+  exit 1
+}
+
+QUERY="interpolate=true&include=grades"
+TOKEN=
+
+while [[ $# -gt 0 ]]; do
+  case $1 in
+    -h|--help)
+      print_help_and_exit
+      ;;
+    -g|--group)
+      shift # past argument
+      QUERY+="&filter\[group\]=$1"
+      shift # past value
+      ;;
+    -s|--subject)
+      shift # past argument
+      QUERY+="&filter\[subject\]=$1"
+      shift # past value
+      ;;
+    -i|--interval)
+      shift # past argument
+      QUERY+="&filter\[interval\]=$1"
+      shift # past value
+      ;;
+    -t|--token)
+      shift # past argument
+      TOKEN="$1"
+      shift # past value
+      ;;
+    -*)
+      echo "Unknown option $1"
+      print_help_and_exit
+      ;;
+    *)
+      echo "Unknown additional argument $1"
+      print_help_and_exit
+      ;;
+  esac
+done
+
+if [[ -z "$TOKEN" ]]; then
+  printf "Token is required!\n"
+  print_help_and_exit
+fi
+
+LIST=$(curl "http://localhost:8000/api/collections?$QUERY" -H "Authorization: Bearer $TOKEN" | jq '.data[] | { collection_id: .id, student_id: (.grades[] | select(.value == "") | .student.id) }' -r --compact-output)
+
+for item in $LIST; do
+  collection_id=$(echo "$item" | jq '.collection_id')
+  student_id=$(echo "$item" | jq '.student_id')
+  value=$((RANDOM % 6 + 1))
+  given_at=$(date +"%Y-%m-%d")
+  data=$(jq -n --compact-output "{ collection_id: $collection_id, student_id: $student_id, value: $value, given_at: \"$given_at\" }")
+
+  printf "Setting grade for %6s in collection %6s to %2s.." "$student_id" "$collection_id" "$value"
+  echo "$data" | curl -s 'http://localhost:8000/api/grades' -H "Authorization: Bearer $TOKEN" -X POST --json @- >/dev/null 
+  printf "done\n"
+done
+