diff --git a/README.md b/README.md
index 9b23b5f..1169c52 100644
--- a/README.md
+++ b/README.md
@@ -1,73 +1,10 @@
-# Operational notes
-
-## Postgres upgrade
-
-1. Stop services that use postgres
-```bash
-systemctl stop matrix-synapse grafana
-```
-2. Login as postgres user
-```bash
-sudo -su postgres
-old=16
-cd /var/lib/postgresql/
-pg_old=$(nix-build --no-out-link -A postgresql_${old:?} '<nixpkgs>')
-pg_new=$(nix-build --no-out-link -A postgresql_$((old+1)) '<nixpkgs>')
-```
-3. Initialize new data directory
-```bash
-$pg_new/bin/initdb --encoding=UTF8 --locale=C $((old+1))
-```
-4. Run check
-```bash
-$pg_new/bin/pg_upgrade \
-	--old-bindir=$pg_old/bin \
-	--new-bindir=$pg_new/bin \
-	--old-datadir=/var/lib/postgresql/${old:?} \
-	--new-datadir=/var/lib/postgresql/$((old+1)) \
-	-j16 \
-	--clone \
-	--check
-```
-5. Stop the old Postgres
-```bash
-systemctl stop postgresql
-```
-6. Run the migration
-```bash
-$pg_new/bin/pg_upgrade \
-	--old-bindir=$pg_old/bin \
-	--new-bindir=$pg_new/bin \
-	--old-datadir=/var/lib/postgresql/${old:?} \
-	--new-datadir=/var/lib/postgresql/$((old+1)) \
-	-j16 \
-	--clone
-```
-7. Start the new Postgres
-```bash
-services.postgres.packages = pkgs.postgresql_17;
-nixos-rebuild switch
-```
-
-Cleanup (after a few days):
-
-```bash
-sudo -su postgres
-vacuumdb --all --analyze-in-stages
-cd /var/lib/postgresql/
-./delete_old_cluster.sh
-rm -v delete_old_cluster.sh
-```
-
 # Tarball
 
 ```bash
-nix build .#nixosConfigurations.<hostname>.config.system.build.image
+nix build .#nixosConfigurations.matrix.config.system.build.image
 ```
 
-# Matrix
-
-## HTTP
+# HTTP
 
 Configure `berlin.ccc.de` web server to send federation traffic to the matrix server:
 
@@ -87,7 +24,7 @@ server {
 }
 ```
 
-## DNS
+# DNS
 
 ```dns
 _matrix-fed._tcp.berlin.ccc.de.  IN SRV    10 0 443 matrix.berlin.ccc.de.
@@ -102,7 +39,7 @@ matrix.berlin.ccc.de.            IN SSHFP  4 1 62d10fa57f8a1aa7469cd9b00621e4ce8
 matrix.berlin.ccc.de.            IN SSHFP  4 2 ca80a6685984da140ac850e4951fa31e70b616e87f62f46437af3bfd215af887
 ```
 
-## Bots
+# Bots
 
 ```bash
 register_new_matrix_user \
@@ -112,7 +49,7 @@ register_new_matrix_user \
     --password <YOUR_PASSWORD>
 ```
 
-## Draupnir
+# Draupnir
 
 Remove rate limit for account:
 
diff --git a/hosts/matrix.nix b/configuration.nix
similarity index 75%
rename from hosts/matrix.nix
rename to configuration.nix
index ca2942d..0f7677a 100644
--- a/hosts/matrix.nix
+++ b/configuration.nix
@@ -74,8 +74,6 @@
     nameservers = [
       "2606:4700:4700::1111#one.one.one.one"
       "2620:fe::fe#dns.quad9.net"
-      "1.1.1.1#one.one.one.one"
-      "9.9.9.9#dns.quad9.net"
     ];
     useDHCP = false;
     useNetworkd = true;
@@ -97,23 +95,40 @@
   };
 
   time.timeZone = "Europe/Berlin";
-  i18n.defaultLocale = "en_GB.UTF-8";
+  i18n.defaultLocale = "en_US.UTF-8";
   console.font = "Lat2-Terminus16";
 
   services = {
     fstrim.enable = false; # Let Proxmox host handle fstrim
-    openssh.banner = ''
-                          __                                               __
-                         /\ \__         __                                /\ \
-        ___ ___      __  \ \ ,_\  _ __ /\_\   __  _      ___    ___    ___\ \ \____
-      /' __` __`\  /'__`\ \ \ \/ /\`'__\/\ \ /\ \/'\    /'___\ /'___\ /'___\ \ '__`\
-      /\ \/\ \/\ \/\ \L\.\_\ \ \_\ \ \/ \ \ \\/>  </   /\ \__//\ \__//\ \__/\ \ \L\ \
-      \ \_\ \_\ \_\ \__/.\_\\ \__\\ \_\  \ \_\/\_/\_\  \ \____\ \____\ \____\\ \_,__/
-       \/_/\/_/\/_/\/__/\/_/ \/__/ \/_/   \/_/\//\/_/   \/____/\/____/\/____/ \/___/
-    '';
+    openssh = {
+      enable = true;
+      settings = {
+        PermitEmptyPasswords = "no";
+        PermitRootLogin = "prohibit-password";
+        PasswordAuthentication = false;
+        KbdInteractiveAuthentication = false;
+      };
+      banner = ''
+                            __                                               __
+                           /\ \__         __                                /\ \
+          ___ ___      __  \ \ ,_\  _ __ /\_\   __  _      ___    ___    ___\ \ \____
+        /' __` __`\  /'__`\ \ \ \/ /\`'__\/\ \ /\ \/'\    /'___\ /'___\ /'___\ \ '__`\
+        /\ \/\ \/\ \/\ \L\.\_\ \ \_\ \ \/ \ \ \\/>  </   /\ \__//\ \__//\ \__/\ \ \L\ \
+        \ \_\ \_\ \_\ \__/.\_\\ \__\\ \_\  \ \_\/\_/\_\  \ \____\ \____\ \____\\ \_,__/
+         \/_/\/_/\/_/\/__/\/_/ \/__/ \/_/   \/_/\//\/_/   \/____/\/____/\/____/ \/___/
+      '';
+    };
+    sshguard = {
+      enable = true;
+      services = [ "sshd" ];
+    };
     # Cache DNS lookups to improve performance
     resolved = {
       enable = true;
+      fallbackDns = [
+        "1.1.1.1#one.one.one.one"
+        "9.9.9.9#dns.quad9.net"
+      ];
       dnssec = "allow-downgrade";
       dnsovertls = "true";
       extraConfig = ''
@@ -124,7 +139,6 @@
   };
 
   programs = {
-    mtr.enable = true;
     vim = {
       enable = true;
       defaultEditor = true;
diff --git a/flake.lock b/flake.lock
index 0025b4a..811cfc3 100644
--- a/flake.lock
+++ b/flake.lock
@@ -68,11 +68,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1769598131,
-        "narHash": "sha256-e7VO/kGLgRMbWtpBqdWl0uFg8Y2XWFMdz0uUJvlML8o=",
+        "lastModified": 1764677808,
+        "narHash": "sha256-H3lC7knbXOBrHI9hITQ7modLuX20mYJVhZORL5ioms0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "fa83fd837f3098e3e678e6cf017b2b36102c7211",
+        "rev": "1aab89277eb2d87823d5b69bae631a2496cff57a",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index fbc725b..791a00f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,11 +1,13 @@
 {
-  description = "CCCB services";
+  description = "Matrix server for CCCB";
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
     #flake-utils.url = "github:numtide/flake-utils";
     agenix = {
       url = "github:ryantm/agenix";
-      inputs.nixpkgs.follows = "nixpkgs";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+      };
     };
   };
   outputs =
@@ -71,9 +73,9 @@
               draupnir_access_token = {
                 file = ./secrets/draupnir_access_token.age;
                 mode = "440";
-                owner = "root";
-                group = "root";
-              };
+                owner = "draupnir";
+                group = "draupnir";
+              };              
               grafana_secret_key = {
                 file = ./secrets/grafana_secret_key.age;
                 mode = "440";
@@ -88,9 +90,7 @@
               };
             };
           }
-          ./hosts/matrix.nix
-
-          ./services/openssh.nix
+          ./configuration.nix
 
           ./services/nginx.nix
           ./services/postgres.nix
@@ -102,19 +102,6 @@
           ./services/grafana.nix
         ];
       };
-      nixosConfigurations."hedgedoc" = nixpkgs.lib.nixosSystem {
-        #system = "x86_64-linux";
-        #pkgs = import nixpkgs { inherit system; };
-        inherit system;
-        modules = [
-          agenix.nixosModules.default
-          { environment.systemPackages = [ (agenix.packages.${system}.default) ]; }
-
-          ./hosts/hedgedoc.nix
-
-          ./services/openssh.nix
-        ];
-      };
     };
   #);
 }
diff --git a/hosts/hedgedoc.nix b/hosts/hedgedoc.nix
deleted file mode 100644
index 0f5ed23..0000000
--- a/hosts/hedgedoc.nix
+++ /dev/null
@@ -1,158 +0,0 @@
-{
-  config,
-  modulesPath,
-  pkgs,
-  lib,
-  ...
-}:
-
-{
-  imports = [ (modulesPath + "/virtualisation/proxmox-lxc.nix") ];
-
-  systemd.suppressedSystemUnits = [
-    "dev-mqueue.mount"
-    "sys-kernel-debug.mount"
-    "sys-fs-fuse-connections.mount"
-  ];
-
-  nix = {
-    optimise = {
-      automatic = true;
-      dates = [ "11:00" ];
-    };
-    settings = {
-      auto-optimise-store = true;
-      sandbox = false;
-      # Allow remote updates
-      trusted-users = [
-        "root"
-        "@wheel"
-      ];
-      experimental-features = [
-        "nix-command"
-        "flakes"
-      ];
-    };
-    gc = {
-      automatic = true;
-      options = "--delete-older-than 14d";
-    };
-  };
-
-  nixpkgs.hostPlatform = "x86_64-linux";
-
-  environment.systemPackages = with pkgs; [
-    vim
-    git
-  ];
-
-  proxmoxLXC = {
-    manageNetwork = false;
-    manageHostName = false;
-    privileged = false;
-  };
-
-  users.users.root = {
-    packages = with pkgs; [
-      kitty # for terminfo
-      fastfetch # for shits and giggles
-    ];
-    openssh.authorizedKeys.keys = [
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICW1+Ml8R9x1LCJaZ8bIZ1qIV4HCuZ6x7DziFW+0Nn5T xengi@kanae_2022-12-09"
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICmb+mJfo84IagUaRoDEqY9ROjjQUOQ7tMclpN6NDPrX xengi@kota_2022-01-16"
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICyklb7dvEHH0VBEMmTUQFKHN6ekBQqkDKj09+EilUIQ xengi@lucy_2018-09-08"
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICjv9W8WXq9QGkgmANNPQR24/I1Pm1ghxNIHftEI+jlZ xengi@mayu_2021-06-11"
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGhyfD+8jMl6FDSADb11sfAsJk0KNoVzjjiDRZjUOtmf xengi@nana_2019-08-16"
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMPtGqhV7io3mhIoZho4Yf7eCo0sUZvjT2NziM2PkXSo xengi@nyu_2017-10-11"
-    ];
-  };
-
-  networking = {
-    hostName = "hedgedoc";
-    domain = "berlin.ccc.de";
-    nameservers = [
-      "2606:4700:4700::1111#one.one.one.one"
-      "2620:fe::fe#dns.quad9.net"
-      "1.1.1.1#one.one.one.one"
-      "9.9.9.9#dns.quad9.net"
-    ];
-    useDHCP = false;
-    useNetworkd = true;
-    dhcpcd.enable = false;
-    nftables.enable = true;
-    tempAddresses = "disabled";
-    firewall = {
-      enable = true;
-      allowedTCPPorts = [
-        22 # SSH
-        80 # HTTP/1
-        443 # HTTP/2
-      ];
-      allowedUDPPorts = [
-        443 # HTTP/3
-      ];
-    };
-  };
-
-  time.timeZone = "Europe/Berlin";
-  i18n.defaultLocale = "en_GB.UTF-8";
-  console.font = "Lat2-Terminus16";
-
-  services = {
-    fstrim.enable = false; # Let Proxmox host handle fstrim
-    openssh.banner = ''
-       __                 __                     __
-      /\ \               /\ \                   /\ \
-      \ \ \___      __   \_\ \     __      __   \_\ \    ___     ___
-       \ \  _ `\  /'__`\ /'_` \  /'_ `\  /'__`\ /'_` \  / __`\  /'___\
-        \ \ \ \ \/\  __//\ \L\ \/\ \L\ \/\  __//\ \L\ \/\ \L\ \/\ \__/
-         \ \_\ \_\ \____\ \___,_\ \____ \ \____\ \___,_\ \____/\ \____\
-          \/_/\/_/\/____/\/__,_ /\/___L\ \/____/\/__,_ /\/___/  \/____/
-                                   /\____/
-                                   \_/__/
-    '';
-    # Cache DNS lookups to improve performance
-    resolved = {
-      enable = true;
-      dnssec = "allow-downgrade";
-      dnsovertls = "true";
-      extraConfig = ''
-        Cache=true
-        CacheFromLocalhost=true
-      '';
-    };
-  };
-
-  programs = {
-    mtr.enable = true;
-    vim = {
-      enable = true;
-      defaultEditor = true;
-    };
-    htop = {
-      enable = true;
-    };
-    tmux = {
-      enable = true;
-      terminal = "screen-256color";
-      shortcut = "a";
-      newSession = true;
-      clock24 = true;
-    };
-    ssh.startAgent = true;
-  };
-
-  security = {
-    acme = {
-      acceptTerms = true;
-      defaults = {
-        validMinDays = 14;
-        renewInterval = "daily";
-        email = "acme@xengi.de";
-        group = "nginx";
-      };
-    };
-  };
-
-  system.stateVersion = "25.11";
-}
diff --git a/services/openssh.nix b/services/openssh.nix
deleted file mode 100644
index 7c3a4ee..0000000
--- a/services/openssh.nix
+++ /dev/null
@@ -1,19 +0,0 @@
-{ ... }:
-
-{
-  services = {
-    openssh = {
-      enable = true;
-      settings = {
-        PermitEmptyPasswords = "no";
-        PermitRootLogin = "prohibit-password";
-        PasswordAuthentication = false;
-        KbdInteractiveAuthentication = false;
-      };
-    };
-    sshguard = {
-      enable = true;
-      services = [ "sshd" ];
-    };
-  };
-}
diff --git a/services/postgres.nix b/services/postgres.nix
index 98d526d..a866fa5 100644
--- a/services/postgres.nix
+++ b/services/postgres.nix
@@ -1,10 +1,10 @@
-{ pkgs, ... }:
+{ ... }:
 
 {
   services = {
     postgresql = {
       enable = true;
-      package = pkgs.postgresql_16;
+      #package = pkgs.postgresql_18;
       enableJIT = true;
       initdbArgs = [
         "--locale=C"