From 8458182990a2ed040daa7b7321779c14a0bb9559 Mon Sep 17 00:00:00 2001
From: krek0 <kreko@posteo.net>
Date: Fri, 24 Apr 2026 23:26:09 +0200
Subject: [PATCH] Enable Write-Ahead Logging (WAL) for SQLite to improve
 performance when using it.

---
 photo21/settings.py  |  3 +++
 photologue/apps.py   | 17 +++++++++++++++++
 photologue/models.py |  2 +-
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/photo21/settings.py b/photo21/settings.py
index 88390ae..fb36c54 100644
--- a/photo21/settings.py
+++ b/photo21/settings.py
@@ -129,6 +129,9 @@ DATABASES = {
     "default": {
         "ENGINE": "django.db.backends.sqlite3",
         "NAME": os.path.join(BASE_DIR, "db.sqlite3"),
+        "OPTIONS": {
+            "timeout": 10,
+        },
     }
 }
 
diff --git a/photologue/apps.py b/photologue/apps.py
index a446591..10f0a9b 100644
--- a/photologue/apps.py
+++ b/photologue/apps.py
@@ -3,8 +3,25 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from django.apps import AppConfig
+from django.db.backends.signals import connection_created
 
 
 class PhotologueConfig(AppConfig):
     default_auto_field = "django.db.models.AutoField"
     name = "photologue"
+
+    def ready(self):
+        from django.db import connection
+
+        def enable_sqlite_wal(sender, connection, **kwargs):
+            if connection.vendor == "sqlite":
+                cursor = connection.cursor()
+                cursor.execute("PRAGMA journal_mode=WAL;")
+                cursor.execute("PRAGMA synchronous=OFF;")
+                cursor.execute("PRAGMA journal_size_limit=67108864;")
+                cursor.execute("PRAGMA wal_autocheckpoint=1000;")
+                cursor.execute("PRAGMA cache_size=-65536;")
+                cursor.execute("PRAGMA temp_store=MEMORY;")
+                cursor.execute("PRAGMA mmap_size=268435456;")
+
+        connection_created.connect(enable_sqlite_wal)
diff --git a/photologue/models.py b/photologue/models.py
index 3585e8c..594ac2c 100644
--- a/photologue/models.py
+++ b/photologue/models.py
@@ -486,7 +486,7 @@ class ImageModel(models.Model):
             self._old_image.storage.delete(
                 self._old_image.name
             )  # Delete (old) base image.
-        if self.date_taken is None or image_has_changed:
+        if (self.date_taken is None or image_has_changed) and self.image:
             # Attempt to get the date the photo was taken from the EXIF data.
             try:
                 exif_date = self.exif(self.image.file).get(