[mod] migrate from Redis to Valkey (#4795)

This patch migrates from `redis==5.2.1` [1] to `valkey==6.1.0` [2].

The migration to valkey is necessary because the company behind Redis has decided
to abandon the open source license. After experiencing a drop in user numbers,
they now want to run it under a dual license again. But this move demonstrates
once again how unreliable the company is and how it treats open source
developers.

To review first, read the docs::

    $ make docs.live

Follow the instructions to remove redis:

- http://0.0.0.0:8000/admin/settings/settings_redis.html

Config and install a local valkey DB:

- http://0.0.0.0:8000/admin/settings/settings_valkey.html

[1] https://pypi.org/project/redis/
[2] https://pypi.org/project/valkey/

Co-authored-by: HLFH <gaspard@dhautefeuille.eu>
Co-authored-by: Markus Heiser <markus.heiser@darmarit.de>

1 files changed, 6 insertions, 5 deletions

diff --git a/docs/admin/arch_public.dot b/docs/admin/arch_public.dot
index 49b03d157..c131186d0 100644
--- a/docs/admin/arch_public.dot
+++ b/docs/admin/arch_public.dot
@@ -7,7 +7,8 @@ digraph G {
   rp      [label="reverse proxy"];
   static  [label="static files", shape=folder, href="url to configure static files", fillcolor=lightgray];
   uwsgi   [label="uwsgi", shape=parallelogram href="https://docs.searxng.org/utils/searxng.sh.html"]
-  redis     [label="redis DB", shape=cylinder];
+  valkey  [label="valkey DB", shape=cylinder];
+
   searxng1  [label="SearXNG #1", fontcolor=blue3];
   searxng2  [label="SearXNG #2", fontcolor=blue3];
   searxng3  [label="SearXNG #3", fontcolor=blue3];
@@ -21,10 +22,10 @@ digraph G {
       { rank=same; static rp };
       rp -> static  [label="optional: reverse proxy serves static files", fillcolor=slategray, fontcolor=slategray];
       rp -> uwsgi [label="http:// (tcp) or unix:// (socket)"];
-      uwsgi -> searxng1 -> redis;
-      uwsgi -> searxng2 -> redis;
-      uwsgi -> searxng3 -> redis;
-      uwsgi -> searxng4 -> redis;
+      uwsgi -> searxng1 -> valkey;
+      uwsgi -> searxng2 -> valkey;
+      uwsgi -> searxng3 -> valkey;
+      uwsgi -> searxng4 -> valkey;
   }
 
 }