feat: first entities in database

lib/bds/slug.ex

@@ -0,0 +1,23 @@
+defmodule BDS.Slug do
+  @moduledoc false
+
+  @german_transliterations %{"ß" => "ss"}
+
+  def slugify(nil), do: ""
+
+  def slugify(value) when is_binary(value) do
+    value
+    |> replace_german_characters()
+    |> String.normalize(:nfd)
+    |> String.replace(~r/[^\p{ASCII}]/u, "")
+    |> String.downcase()
+    |> String.replace(~r/[^a-z0-9]+/u, "-")
+    |> String.replace(~r/^-+|-+$/u, "")
+  end
+
+  defp replace_german_characters(value) do
+    Enum.reduce(@german_transliterations, value, fn {source, target}, acc ->
+      String.replace(acc, source, target)
+    end)
+  end
+end