fix: parser errors

lib/bds/frontmatter.ex

@@ -102,13 +102,18 @@ defmodule BDS.Frontmatter do
 
   defp parse_scalar(key, value) when is_binary(key) and is_binary(value) do
     trimmed = String.trim(value)
+    parsed = parse_generic_scalar(trimmed)
 
     cond do
       timestamp_key?(key) ->
-        Persistence.parse_timestamp(trimmed) || parse_generic_scalar(trimmed)
+        if is_binary(parsed) do
+          Persistence.parse_timestamp(parsed) || parsed
+        else
+          parsed
+        end
 
       true ->
-        parse_generic_scalar(trimmed)
+        parsed
     end
   end
 
@@ -120,6 +125,7 @@ defmodule BDS.Frontmatter do
 
   defp parse_generic_scalar("true"), do: true
   defp parse_generic_scalar("false"), do: false
+  defp parse_generic_scalar("[]"), do: []
 
   defp parse_generic_scalar(value) do
     if Regex.match?(~r/^-?\d+$/, value) do
@@ -137,6 +143,14 @@ defmodule BDS.Frontmatter do
     |> String.replace("\\\\", "\\")
   end
 
+  defp parse_string("'" <> rest) do
+    rest
+    |> String.trim_trailing("'")
+    |> String.replace("\\n", "\n")
+    |> String.replace("\\'", "'")
+    |> String.replace("\\\\", "\\")
+  end
+
   defp parse_string(value), do: value
 
   defp serialize_scalar(_key, value) when is_boolean(value) do

lib/bds/sidecar.ex

@@ -79,10 +79,18 @@ defmodule BDS.Sidecar do
 
   defp parse_scalar(key, value) when is_binary(key) and is_binary(value) do
     trimmed = String.trim(value)
+    parsed = parse_generic_scalar(trimmed)
 
     cond do
-      timestamp_key?(key) -> Persistence.parse_timestamp(trimmed) || parse_generic_scalar(trimmed)
+      timestamp_key?(key) ->
-      true -> parse_generic_scalar(trimmed)
+        if is_binary(parsed) do
+          Persistence.parse_timestamp(parsed) || parsed
+        else
+          parsed
+        end
+
+      true ->
+        parsed
     end
   end
 
@@ -94,6 +102,7 @@ defmodule BDS.Sidecar do
 
   defp parse_generic_scalar("true"), do: true
   defp parse_generic_scalar("false"), do: false
+  defp parse_generic_scalar("[]"), do: []
 
   defp parse_generic_scalar(value) do
     if Regex.match?(~r/^-?\d+$/, value) do
@@ -111,6 +120,14 @@ defmodule BDS.Sidecar do
     |> String.replace("\\\\", "\\")
   end
 
+  defp parse_string("'" <> rest) do
+    rest
+    |> String.trim_trailing("'")
+    |> String.replace("\\n", "\n")
+    |> String.replace("\\'", "'")
+    |> String.replace("\\\\", "\\")
+  end
+
   defp parse_string(value), do: value
 
   defp serialize_scalar(_key, value) when is_boolean(value) do

test/bds/media_test.exs

@@ -200,6 +200,46 @@ defmodule BDS.MediaTest do
     end)
   end
 
+  test "rebuild_media_from_files parses inline empty tag arrays", %{
+    project: project,
+    temp_dir: temp_dir
+  } do
+    media_dir = Path.join([temp_dir, "media", "2002", "11"])
+    File.mkdir_p!(media_dir)
+
+    binary_path = Path.join(media_dir, "muehle.jpg")
+    sidecar_path = binary_path <> ".meta"
+
+    File.write!(binary_path, tiny_jpeg_binary())
+
+    File.write!(
+      sidecar_path,
+      [
+        "id: 23c69669-678d-4b0b-bb10-c4c31bd427d1",
+        "originalName: muehle.jpg",
+        "mimeType: image/jpeg",
+        "size: #{byte_size(tiny_jpeg_binary())}",
+        "width: 3",
+        "height: 2",
+        "title: Beitrag ohne Titel",
+        "alt: Ein grüner Mühlenbau mit Windmühlen in einem goldgelben Feld",
+        "caption: Ein friedlicher Blick auf eine alte Mühle und die Weizenernte unter einem strahlend blauen Himmel.",
+        "createdAt: '2002-11-17T00:00:00.000Z'",
+        "updatedAt: '2026-03-18T15:31:10.146Z'",
+        "tags: []",
+        ""
+      ]
+      |> Enum.join("\n")
+    )
+
+    assert {:ok, [media]} = BDS.Media.rebuild_media_from_files(project.id)
+    assert media.id == "23c69669-678d-4b0b-bb10-c4c31bd427d1"
+    assert media.original_name == "muehle.jpg"
+    assert media.tags == []
+    assert media.created_at == 1_037_491_200_000
+    assert media.updated_at == 1_773_847_870_146
+  end
+
   test "import_media generates the four thumbnail files in bucketed thumbnail paths", %{
     project: project,
     temp_dir: temp_dir

test/bds/posts_test.exs

@@ -384,6 +384,51 @@ defmodule BDS.PostsTest do
     assert translation.content == nil
   end
 
+  test "rebuild_posts_from_files parses quoted canonical timestamps and inline empty tag arrays" do
+    temp_dir =
+      Path.join(System.tmp_dir!(), "bds-post-rebuild-quoted-#{System.unique_integer([:positive])}")
+
+    File.mkdir_p!(temp_dir)
+    on_exit(fn -> File.rm_rf(temp_dir) end)
+
+    assert {:ok, project} =
+             BDS.Projects.create_project(%{name: "Quoted Rebuild", data_path: temp_dir})
+
+    posts_dir = Path.join([BDS.Projects.project_data_dir(project), "posts", "2002", "11"])
+    File.mkdir_p!(posts_dir)
+
+    File.write!(
+      Path.join(posts_dir, "p10.md"),
+      [
+        "---",
+        "id: 1c1ecaeb-c94c-446a-9291-e946cb991637",
+        "title: Chimera",
+        "slug: p10",
+        "status: published",
+        "language: de",
+        "createdAt: '2002-11-05T12:00:00.000Z'",
+        "updatedAt: '2026-03-04T14:11:28.000Z'",
+        "publishedAt: '2002-11-05T12:00:00.000Z'",
+        "tags: []",
+        "categories:",
+        "  - article",
+        "---",
+        "Quelle",
+        ""
+      ]
+      |> Enum.join("\n")
+    )
+
+    assert {:ok, [post]} = BDS.Posts.rebuild_posts_from_files(project.id)
+    assert post.id == "1c1ecaeb-c94c-446a-9291-e946cb991637"
+    assert post.slug == "p10"
+    assert post.tags == []
+    assert post.categories == ["article"]
+    assert post.created_at == 1_036_497_600_000
+    assert post.updated_at == 1_772_633_488_000
+    assert post.published_at == 1_036_497_600_000
+  end
+
   defp errors_on(changeset) do
     Ecto.Changeset.traverse_errors(changeset, fn {message, opts} ->
       Regex.replace(~r"%{(\w+)}", message, fn _, key ->