diff --git a/nix/module.nix b/nix/module.nix
index 7565f68..8b5ee71 100644
--- a/nix/module.nix
+++ b/nix/module.nix
@@ -70,6 +70,16 @@ in
               default = false;
               description = "Whether to upload to the integration endpoint.";
             };
+            header-file = mkOption {
+              type = types.nullOr types.path;
+              default = null;
+              description = "A file containing the `header:value` pair for the integration endpoint.";
+            };
+            basic-file = mkOption {
+              type = types.nullOr types.path;
+              default = null;
+              description = "A file containing the `user:password` pair for the integration endpoint.";
+            };
             header = mkOption {
               type = types.nullOr types.str;
               default = null;
@@ -116,16 +126,15 @@ in
         args = (if cfg.recursive then [ "-r" ] else [ ]) ++
           (if cfg.delete-files then [ "--delete" ] else [ ]) ++
           (if cfg.integration-endpoint.enabled then [ "-i" ] else [ ]) ++
-          (if cfg.integration-endpoint.header != null
-          then
-            [ "--header" "'${cfg.integration-endpoint.header}'" ]
-          else
-            [ ]) ++
-          (if cfg.integration-endpoint.basic != null
-          then
-            [ "--basic" "'${cfg.integration-endpoint.basic}'" ]
-          else
-            [ ]) ++
+          (if cfg.integration-endpoint.header-file != null
+           then [ "--header-file" "'${cfg.integration-endpoint.header-file}'" ]
+           else if cfg.integration-endpoint.basic-file != null
+           then [ "--basic-file" "'${cfg.integration-endpoint.basic-file}'" ]
+           else if cfg.integration-endpoint.header != null
+           then [ "--header" "'${cfg.integration-endpoint.header}'" ]
+           else if cfg.integration-endpoint.basic != null
+           then [ "--basic" "'${cfg.integration-endpoint.basic}'" ]
+           else [ ]) ++
           (if cfg.include-filter != null then
             [ "--matches" "'${toString cfg.include-filter}'" ]
           else [ ]) ++
diff --git a/nix/nixosConfigurations/default.nix b/nix/nixosConfigurations/default.nix
index 3b38fbe..1b53de9 100644
--- a/nix/nixosConfigurations/default.nix
+++ b/nix/nixosConfigurations/default.nix
@@ -2,7 +2,7 @@
 let
   full-text-search = {
     enabled = true;
-    solr.url = "http://localhost:${toString config.services.solr.port}/solr/docspell";
+    backend = "postgresql";
     postgresql = {
       pg-config = {
         "german" = "my-germam";
@@ -43,7 +43,7 @@ in
     # Docspell
     { from = "host"; host.port = 64080; guest.port = 7880; }
   ];
-  system.stateVersion = "22.11";
+  system.stateVersion = "23.11";
   # This slows down the build of a vm
   documentation.enable = false;
 
@@ -64,16 +64,20 @@ in
         watchDir # Note, dsc expects files to be in a subdirectory corresponding to a collective. There is no way to declaratively create a collective as of the time of writing
       ];
     integration-endpoint =
+      let
+        headerFile = pkgs.writeText "int-header-file" ''
+        Docspell-Integration:${integrationHeaderValue}
+        '';
+      in
       {
         enabled = true;
-        header = "Docspell-Integration:${integrationHeaderValue}";
+        header-file = headerFile;
       };
   };
 
   # Docspell service configuration and its requirements
   services.docspell-joex = {
     enable = true;
-    waitForTarget = "solr-init.target";
     bind.address = "0.0.0.0";
     base-url = "http://localhost:7878";
     jvmArgs = [ "-J-Xmx1536M" ];
@@ -108,40 +112,4 @@ in
       };
     };
   };
-  nixpkgs.config = {
-    permittedInsecurePackages = [
-      "solr-8.6.3"
-    ];
-  };
-
-  services.solr = {
-    enable = true;
-  };
-  # This is needed to run solr script as user solr
-  users.users.solr.useDefaultShell = true;
-
-  systemd.services.solr-init =
-    let
-      solrPort = toString config.services.solr.port;
-      initSolr = ''
-        if [ ! -f ${config.services.solr.stateDir}/docspell_core ]; then
-          while ! echo "" | ${pkgs.inetutils}/bin/telnet localhost ${solrPort}
-          do
-             echo "Waiting for SOLR become ready..."
-             sleep 1.5
-          done
-          ${pkgs.su}/bin/su -s ${pkgs.bash}/bin/sh solr -c "${pkgs.solr}/bin/solr create_core -c docspell -p ${solrPort}";
-          touch ${config.services.solr.stateDir}/docspell_core
-        fi
-      '';
-    in
-    {
-      script = initSolr;
-      after = [ "solr.target" ];
-      wantedBy = [ "multi-user.target" ];
-      requires = [ "solr.target" ];
-      description = "Create a core at solr";
-    };
-
-
 }