From c7caeba60dd8cd2679d7cd832abc35c48090276b Mon Sep 17 00:00:00 2001
From: DualFroz <me@dualfroz.com>
Date: Thu, 27 Aug 2026 13:33:00 +0200
Subject: [PATCH] feat(persistence): add snapshot save and load

---
 lib/excache/persistence.ex | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 lib/excache/persistence.ex

diff --git a/lib/excache/persistence.ex b/lib/excache/persistence.ex
new file mode 100644
index 0000000..f4d81d7
--- /dev/null
+++ b/lib/excache/persistence.ex
@@ -0,0 +1,22 @@
+defmodule Excache.Persistence do
+  @moduledoc false
+
+  def snapshot_path do
+    Application.get_env(:excache, :snapshot_path) ||
+      Path.join(to_string(:code.priv_dir(:excache)), "excache.snapshot")
+  end
+
+  def save do
+    path = snapshot_path()
+    File.mkdir_p!(Path.dirname(path))
+    File.write!(path, :erlang.term_to_binary(Excache.Store.dump()))
+    :ok
+  end
+
+  def load_entries(path) do
+    case File.read(path) do
+      {:ok, binary} -> :erlang.binary_to_term(binary)
+      {:error, _reason} -> []
+    end
+  end
+end