From 3b7bce8be90533a7b0ab9fedde1ad1ecb14cd884 Mon Sep 17 00:00:00 2001
From: Arne de Laat <arne@delaat.net>
Date: Thu, 4 Apr 2024 14:02:26 +0200
Subject: [PATCH 1/2] Improve performance for retrieving the latest location
 for a station

---
 publicdb/inforecords/models.py | 25 ++++++++++---------------
 1 file changed, 10 insertions(+), 15 deletions(-)

diff --git a/publicdb/inforecords/models.py b/publicdb/inforecords/models.py
index bb00f615..b15845ba 100644
--- a/publicdb/inforecords/models.py
+++ b/publicdb/inforecords/models.py
@@ -276,22 +276,17 @@ def latest_location(self, date=None):
         if date is None:
             date = datetime.date.today()
 
-        # Initialize new config with all None values.
-        config = Configuration()
-
         try:
-            summaries = Summary.objects.with_config().filter(station=self, date__lte=date).reverse()
-            for summary in summaries:
-                try:
-                    config = (
-                        Configuration.objects.filter(summary=summary).exclude(gps_latitude=0, gps_longitude=0).latest()
-                    )
-                except Configuration.DoesNotExist:
-                    pass
-                else:
-                    break
-        except Summary.DoesNotExist:
-            pass
+            config = (
+                Configuration.objects.exclude(
+                    gps_latitude=0,
+                    gps_longitude=0,
+                    timestamp__gt=date,
+                ).filter(summary__station=self).latest()
+            )
+        except Configuration.DoesNotExist:
+            # Initialize new config with all None values.
+            config = Configuration()
 
         return {
             'latitude': (round(config.gps_latitude, 7) if config.gps_latitude is not None else None),

From 34fb49677f9946a9b501fbc4ab93d37b61fc4a82 Mon Sep 17 00:00:00 2001
From: Arne de Laat <arne@delaat.net>
Date: Fri, 12 Apr 2024 07:43:03 +0200
Subject: [PATCH 2/2] Remove unused import

---
 publicdb/inforecords/models.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/publicdb/inforecords/models.py b/publicdb/inforecords/models.py
index b15845ba..d4676be3 100644
--- a/publicdb/inforecords/models.py
+++ b/publicdb/inforecords/models.py
@@ -8,7 +8,7 @@
 from django.db.models import Max
 from django.utils.text import slugify
 
-from ..histograms.models import Configuration, Summary
+from ..histograms.models import Configuration
 
 FIRSTDATE = datetime.date(2004, 1, 1)