do this https://rdrama.net/h/countryclub/post/79285/-/5969149#context

files/routes/jinja2.py

@@ -1,6 +1,7 @@
 import time
 import math
 import datetime
+import random
 
 from os import environ, listdir, path
 
@@ -87,6 +88,12 @@ def selected_tab(request):
 
 	return 'home'
 
+@app.template_filter("seeded_random")
+def seeded_random(choices, url):
+	if url.startswith('/post/'):
+		random.seed(url)
+	return random.choice(choices)
+
 
 def current_registered_users():
 	return "{:,}".format(g.db.query(User).count())

files/templates/util/macros.html

@@ -5,7 +5,7 @@
 {%- endmacro -%}
 
 {%- macro random_image(path) -%}
-	{{- SITE_FULL_IMAGES ~ "/" ~ path ~ "/" ~ listdir('files/' ~ path)|random() ~ '?x=7' -}}
+	{{- SITE_FULL_IMAGES ~ "/" ~ path ~ "/" ~ listdir('files/' ~ path)|seeded_random(request.path) ~ '?x=7' -}}
 {%- endmacro -%}
 
 {% macro post_meta(p) %}