demo is on

modules/default.nix

@@ -1,5 +1,5 @@
-{ pkgs, lib, ... }: {
-
-	imports = [
-	];
+{...}: {
+  imports = [
+    ./pocketbase.nix
+  ];
 }

modules/pocketbase.nix

@@ -0,0 +1,87 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  cfg = config.services.pocketbase;
+in {
+  options.services.pocketbase = {
+    enable = lib.mkEnableOption "PocketBase backend";
+
+    dataDir = lib.mkOption {
+      type = lib.types.path;
+      default = "/var/lib/pocketbase";
+      description = "Working directory containing the PocketBase binary and data.";
+    };
+
+    openFirewall = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = ''
+        Open ports in the firewall for the PocketBase web interface
+      '';
+    };
+
+    port = lib.mkOption {
+      type = lib.types.int;
+      default = 8090;
+      description = "The port number for the PocketBase.";
+    };
+
+    user = lib.mkOption {
+      type = lib.types.str;
+      default = "root";
+      description = "User to run the PocketBase service as.";
+    };
+
+    group = lib.mkOption {
+      type = lib.types.str;
+      default = "root";
+      description = "Group to run the PocketBase service as.";
+    };
+
+    logFile = lib.mkOption {
+      type = lib.types.path;
+      default = "/var/lib/pocketbase/std.log";
+      description = "Log file used for both stdout and stderr.";
+    };
+
+    package = lib.mkPackageOption pkgs "pocketbase" {};
+  };
+
+  config = lib.mkIf cfg.enable {
+    # Optional: ensure the directory exists with proper ownership
+    systemd.tmpfiles.rules = [
+      "d ${cfg.dataDir} 0700 ${cfg.user} ${cfg.group} -"
+    ];
+
+    systemd.services.pocketbase = {
+      description = "PocketBase";
+      wantedBy = ["multi-user.target"];
+      after = ["network.target"];
+
+      serviceConfig = {
+        Type = "simple";
+        User = cfg.user;
+        Group = cfg.group;
+        LimitNOFILE = 4096;
+        Restart = "always";
+        RestartSec = 5;
+        WorkingDirectory = cfg.dataDir;
+
+        ExecStart = ''
+          ${lib.getExe cfg.package} serve --dir ${cfg.dataDir}/pb_data --http=0.0.0.0:${toString cfg.port}
+        '';
+
+        # Switch to systemd stdout/stderr logging by default
+        # and optionally use append: style if you want exactly your example
+        StandardOutput = "append:${cfg.logFile}";
+        StandardError = "append:${cfg.logFile}";
+      };
+    };
+    networking.firewall = lib.mkIf cfg.openFirewall {
+      allowedTCPPorts = [cfg.port];
+    };
+  };
+}