diff --git a/ggt/iggt.sh b/ggt/iggt.sh
index 826b6aa..2fb8c2b 100644
--- a/ggt/iggt.sh
+++ b/ggt/iggt.sh
@@ -27,6 +27,20 @@ if [[ -z "$custom_path" || "$custom_path" == *$'\n'* ]]; then
   printf 'CustomPath must be exactly one non-empty path.\n' >&2
   exit 1
 fi
+manifest_path="$("$SCRIPT_DIRECTORY/install-gitea-github-theme.sh" --print-manifest-path \
+  "$custom_path/public/assets/css" "$custom_path/templates")"
+
+# Move manifests written by earlier script versions out of CustomPath before Gitea dump scans it.
+for legacy_manifest in \
+  "$custom_path/.gitea-github-theme-files" \
+  "$custom_path/templates/.gitea-github-theme-files"; do
+  if [[ -f "$legacy_manifest" && ! -e "$manifest_path" ]]; then
+    mkdir -p "$(dirname "$manifest_path")"
+    mv -- "$legacy_manifest" "$manifest_path"
+    printf 'Moved theme manifest to %s.\n' "$manifest_path"
+    break
+  fi
+done
 
 if [[ ! "$gitea_version" =~ ^v?([0-9]+\.[0-9]+) ]]; then
   printf 'Unable to determine major.minor from Gitea version: %s\n' "$gitea_version" >&2
@@ -54,11 +68,11 @@ if [[ -z "$theme_version" ]]; then
   exec "$SCRIPT_DIRECTORY/install-gitea-github-theme.sh" --remove \
     "$custom_path/public/assets/css" \
     "$custom_path/templates" \
-    "$custom_path/.gitea-github-theme-files"
+    "$manifest_path"
 fi
 
 exec "$SCRIPT_DIRECTORY/install-gitea-github-theme.sh" \
   "$theme_version" \
   "$custom_path/public/assets/css" \
   "$custom_path/templates" \
-  "$custom_path/.gitea-github-theme-files"
+  "$manifest_path"
diff --git a/ggt/install-gitea-github-theme.sh b/ggt/install-gitea-github-theme.sh
index 915f30b..17b5907 100644
--- a/ggt/install-gitea-github-theme.sh
+++ b/ggt/install-gitea-github-theme.sh
@@ -47,6 +47,23 @@ prepare_directory() {
   printf '%s\n' "$directory"
 }
 
+default_manifest_path() {
+  local css_destination="$1"
+  local templates_destination="$2"
+  local state_directory manifest_key
+
+  if [[ -n "${GITEA_GITHUB_THEME_STATE_DIR:-}" ]]; then
+    state_directory="$GITEA_GITHUB_THEME_STATE_DIR"
+  elif [[ $EUID -eq 0 ]]; then
+    state_directory="/var/lib/gitea-github-theme"
+  else
+    state_directory="${XDG_STATE_HOME:-${HOME:-.}/.local/state}/gitea-github-theme"
+  fi
+
+  manifest_key="$(printf '%s\0%s' "$css_destination" "$templates_destination" | sha256sum | awk '{print $1}')"
+  printf '%s/%s.manifest\n' "$state_directory" "$manifest_key"
+}
+
 remove_theme_files() {
   local css_destination="$1"
   local templates_destination="$2"
@@ -98,11 +115,20 @@ main() {
   local version css_destination templates_destination manifest release_path
 
   require_command find
+  require_command sha256sum
+  require_command awk
+
+  if [[ "${1:-}" == "--print-manifest-path" ]]; then
+    css_destination="$(prepare_directory "${2:-}")"
+    templates_destination="$(prepare_directory "${3:-}")"
+    default_manifest_path "$css_destination" "$templates_destination"
+    return
+  fi
 
   if [[ "${1:-}" == "--remove" ]]; then
     css_destination="$(prepare_directory "${2:-}")"
     templates_destination="$(prepare_directory "${3:-}")"
-    manifest="${4:-$templates_destination/.gitea-github-theme-files}"
+    manifest="${4:-$(default_manifest_path "$css_destination" "$templates_destination")}"
     remove_theme_files "$css_destination" "$templates_destination" "$manifest"
     printf 'Removed installed Gitea GitHub theme files.\n'
     return
@@ -130,7 +156,7 @@ main() {
     read -r -p "Templates destination (for example /path/to/gitea/templates): " templates_destination
   fi
   templates_destination="$(prepare_directory "$templates_destination")"
-  manifest="${4:-$templates_destination/.gitea-github-theme-files}"
+  manifest="${4:-$(default_manifest_path "$css_destination" "$templates_destination")}"
 
   if [[ "$version" == "latest" ]]; then
     release_path="latest/download"
diff --git a/ls_sessions.py b/ls_sessions.py
old mode 100755
new mode 100644
index 4d50160..2d6357c
--- a/ls_sessions.py
+++ b/ls_sessions.py
@@ -8,7 +8,6 @@ from pathlib import Path
 from datetime import datetime
 import re
 
-
 PATTERN = re.compile(
     # r"^rollout-"
     r"(?P<date>\d{4}-\d{2}-\d{2})"
@@ -49,6 +48,7 @@ def format_size(size: int) -> str:
                 return f"{size} B"
             return f"{value:.1f} {unit}"
         value /= 1024
+    raise ValueError()  # unreachable
 
 
 def format_session_line(file: Path) -> str | None:
@@ -62,8 +62,8 @@ def format_session_line(file: Path) -> str | None:
 
     return (
         f'{parsed["started"]:%Y-%m-%d %H:%M:%S} | '
-        f'updated {modified:%Y-%m-%d %H:%M:%S} | '
-        f'{size:>8} | '
+        f"updated {modified:%Y-%m-%d %H:%M:%S} | "
+        f"{size:>8} | "
         f'codex resume {parsed["uuid"]}'
     )