diff --git a/flake.nix b/flake.nix
index 34a4b16..bd65a98 100644
--- a/flake.nix
+++ b/flake.nix
@@ -76,6 +76,41 @@
       "devvm-hemar|${system}"  = import ./nixos/system/devvm-hemar/default.nix 
         { inherit flake self inputs system; };
     };
+
+    #nixosTests = let
+    #  testLib = import (nixpkgs + "/nixos/lib/testing-python.nix") { inherit pkgs; };
+    #in {       
+    #  "hardware/lenovo-ideapad-15arh7" = testLib.makeTest {
+    #    name = "hardware/lenovo-ideapad-15arh7";
+    #    nodes.machine = { ... }: {
+    #      imports = [ self.nixosModules.hectic ];
+    #      services.hardware.lenovo-ideapad-15arh7.enable = true;
+    #    };
+    #    testScript = ''
+    #      start_all()
+    #      machine.wait_for_unit("my-service.service")
+    #      machine.succeed("journalctl -u my-service -b | grep -qi hello")
+    #    '';
+    #  };
+    #};
+
+    checks = let 
+      mkSys = system: opts:
+      (nixpkgs.lib.nixosSystem {
+        inherit system;
+        modules = [
+          self.nixosModules.hectic
+          { services.hardware.lenovo-ideapad-15arh7 = opts; }
+        ];
+      });
+
+      cases = {
+        enable          = { enable = true;  };
+        disabled        = { enable = false; };
+        customFoo       = { enable = true; foo = "bar"; };
+      };
+    in nixpkgs.lib.mapAttrs
+        (name: opts: (mkSys system opts).config.system.build.toplevel) cases;
   }) // {
     lib = self-lib;
     overlays.default           = import ./overlay      { inherit flake self inputs nixpkgs; };
diff --git a/nixos/module/hectic/archetype/base.nix b/nixos/module/hectic/archetype/base.nix
index 33ddf74..9faf312 100644
--- a/nixos/module/hectic/archetype/base.nix
+++ b/nixos/module/hectic/archetype/base.nix
@@ -10,6 +10,10 @@
 }: let
   cfg = config.hectic.archetype.base;
 in {
+  imports = [
+    inputs.disko.nixosModules.default
+  ];
+
   options.hectic.archetype.base.enable = lib.mkEnableOption "Enable archetupe.dev";
 
   config = lib.mkIf cfg.enable {
diff --git a/nixos/module/hectic/archetype/explosive.nix b/nixos/module/hectic/archetype/explosive.nix
new file mode 100644
index 0000000..0938e37
--- /dev/null
+++ b/nixos/module/hectic/archetype/explosive.nix
@@ -0,0 +1,3 @@
+{ ... }: { lib, ... }: {
+  options.hectic.archetype.explosive.enable = lib.mkEnableOption "Enable impermanence usage";
+}
diff --git a/nixos/module/hectic/hardware/lenovo-ideapad-15arh7.nix b/nixos/module/hectic/hardware/lenovo-ideapad-15arh7.nix
new file mode 100644
index 0000000..502e082
--- /dev/null
+++ b/nixos/module/hectic/hardware/lenovo-ideapad-15arh7.nix
@@ -0,0 +1,228 @@
+{
+  inputs,
+  ...
+}:
+{ 
+  lib,
+  config,
+  modulesPath,
+  pkgs,
+  ...
+}: let
+  cfg = config.hectic.hardware.lenovo-ideapad-15arh7;
+  hasDisko = false;
+in {
+  options.hectic.hardware.lenovo-ideapad-15arh7 = {
+    enable = lib.mkEnableOption "Enable lenovo-legion hardware configurations";
+    swapSize = lib.mkOption {
+      type = lib.types.either (lib.types.enum [ "100%" ]) (lib.types.strMatching "[0-9]+[KMGTP]?");
+      default = "0";
+      description = ''
+        Size of the partition, in sgdisk format.
+        sets end automatically with the + prefix
+        can be 100% for the whole remaining disk, will be done last in that case.
+      '';
+    };
+    device = lib.mkOption {
+      type = lib.types.str;
+      default = "0";
+      description = ''
+        Size of the partition, in sgdisk format.
+        sets end automatically with the + prefix
+        can be 100% for the whole remaining disk, will be done last in that case.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    zlaupa = 12;
+    imports = [
+      "${inputs.nixos-hardware}/common/cpu/amd"
+      "${inputs.nixos-hardware}/common/cpu/amd/pstate.nix"
+      "${inputs.nixos-hardware}/common/gpu/amd"
+      "${inputs.nixos-hardware}/common/gpu/nvidia/prime-sync.nix"
+      "${inputs.nixos-hardware}/common/pc/laptop"
+      "${inputs.nixos-hardware}/common/pc/laptop/ssd"
+    ];
+
+    /* common */
+    hardware.nvidia = {
+      modesetting.enable = true;
+      prime = {
+        amdgpuBusId = "PCI:5:0:0";
+        nvidiaBusId = "PCI:1:0:0";
+      };
+    };
+    
+    environment.systemPackages = with pkgs; [
+      vulkan-tools
+    ];
+    /* */
+
+    /* boot */
+    boot.initrd.availableKernelModules = [
+      "nvme"
+      "xhci_pci"
+      "usb_storage"
+      "usbhid"
+      "sd_mod"
+    ];
+    boot.initrd.kernelModules = [ "dm-snapshot" "amdgpu" ];
+    boot.kernelModules = [ "kvm-amd" ];
+    boot.extraModulePackages = [ ];
+    /* */
+
+    networking.useDHCP = lib.mkDefault true;
+    nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+
+    /* cpu */
+    hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+
+    /* gpu */
+    services.xserver.videoDrivers = [ 
+      "nvidia" 
+      #"amdgpu"  # NOTE: probably useles with nvidia optimus prime
+      #"nouveau" # NOTE: open source nvidia
+    ];
+
+    hardware.opengl = {
+      enable = true;
+      driSupport = true;
+      driSupport32Bit = true;
+      extraPackages = with pkgs; [
+        vulkan-loader
+        vulkan-validation-layers
+        vulkan-extension-layer
+        amdvlk
+
+      ];
+      extraPackages32 = with pkgs; [
+        pkgsi686Linux.vulkan-loader
+        pkgsi686Linux.vulkan-validation-layers
+        pkgsi686Linux.vulkan-extension-layer
+        driversi686Linux.amdvlk
+      ];
+    };
+
+    #environment.variables.VK_DRIVER_FILES=/run/opengl-driver/share/vulkan/icd.d/nvidia_icd.x86_64.json;
+    #environment.sessionVariables.VK_DRIVER_FILES = "/run/opengl-driver/share/vulkan/icd.d/nvidia_icd.x86_64.json";
+
+    #environment.sessionVariables = rec {
+    #  VK_ICD_FILENAMES = 
+    #    "${config.hardware.nvidia.package}/share/vulkan/icd.d/nvidia_icd.x86_64.json";
+
+    #    #:${config.environment.variables.VK_ICD_FILENAMES or ""}";
+    #};
+
+
+    hardware.nvidia = {
+      # Nvidia power management. Experimental, and can cause sleep/suspend to fail.
+      # Enable this if you have graphical corruption issues or application crashes after waking
+      # up from sleep. This fixes it by saving the entire VRAM memory to /tmp/ instead 
+      # of just the bare essentials.
+      powerManagement.enable = false;
+
+      # Fine-grained power management. Turns off GPU when not in use.
+      # Experimental and only works on modern Nvidia GPUs (Turing or newer).
+      powerManagement.finegrained = false;
+
+      # Use the NVidia open source kernel module (not to be confused with the
+      # independent third-party "nouveau" open source driver).
+      # Support is limited to the Turing and later architectures. Full list of 
+      # supported GPUs is at: 
+      # https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus 
+      # Only available from driver 515.43.04+
+      # Currently alpha-quality/buggy, so false is currently the recommended setting.
+      open = false;
+
+      # Enable the Nvidia settings menu,
+      # accessible via `nvidia-settings`.
+      nvidiaSettings = true;
+
+      # nvidia package overwrive
+      package = config.boot.kernelPackages.nvidiaPackages.stable;
+
+    };
+    /* */
+
+    /* sound */
+    hardware.pulseaudio.enable = true;
+    hardware.pulseaudio.support32Bit = true;
+    /* */
+
+    /* disk */
+    disko.devices = {
+      disk.main = {
+        inherit (cfg) device;
+        type = "disk";
+        content = {
+          type = "gpt";
+          partitions = {
+            boot = {
+              name = "boot";
+              size = "1M";
+              type = "EF02";
+            };
+            esp = {
+              name = "ESP";
+              size = "500M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+              };
+            };
+            swap = {
+              size = cfg.swapSize;
+              content = {
+                type = "swap";
+                resumeDevice = true;
+              };
+            };
+            root = {
+              name = "root";
+              size = "100%";
+              content = {
+                type = "lvm_pv";
+                vg = "root_vg";
+              };
+            };
+          };
+        };
+      };
+      lvm_vg = {
+        root_vg = {
+          type = "lvm_vg";
+          lvs = {
+            root = {
+              size = "100%FREE";
+              content = {
+                type = "btrfs";
+                extraArgs = ["-f"];
+
+                subvolumes = lib.mkMerge [
+		  {
+                    "/root" = {
+                      mountpoint = "/";
+                    };
+                    "/nix" = {
+                      mountOptions = ["subvol=nix" "noatime"];
+                      mountpoint = "/nix";
+                    };
+		  }
+		  (if config.hectic.archetype.explosive.enable then {
+                    "/persist" = {
+                      mountOptions = ["subvol=persist" "noatime"];
+                      mountpoint = "/persist";
+                    };
+		  } else {})
+		];
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}
diff --git a/nixos/module/hectic/hardware/lenovo-legion.nix b/nixos/module/hectic/hardware/lenovo-legion.nix
deleted file mode 100644
index 041909b..0000000
--- a/nixos/module/hectic/hardware/lenovo-legion.nix
+++ /dev/null
@@ -1,148 +0,0 @@
-{
-  ...
-}:
-{ 
-  inputs,
-  lib,
-  config,
-  modulesPath,
-  ...
-}: let
-  cfg = config.hectic.hardware.lenovo-legion;
-  hasDisko = false;
-in {
-  options.hectic.hardware.lenovo-legion = {
-    enable = lib.mkEnableOption "Enable lenovo-legion hardware configurations";
-    swapSize = lib.mkOption {
-      type = lib.types.either (lib.types.enum [ "100%" ]) (lib.types.strMatching "[0-9]+[KMGTP]?");
-      default = "0";
-      description = ''
-        Size of the partition, in sgdisk format.
-        sets end automatically with the + prefix
-        can be 100% for the whole remaining disk, will be done last in that case.
-      '';
-    };
-    device = lib.mkOption {
-      type = lib.types.str;
-      default = "0";
-      description = ''
-        Size of the partition, in sgdisk format.
-        sets end automatically with the + prefix
-        can be 100% for the whole remaining disk, will be done last in that case.
-      '';
-    };
-  };
-
-  config = lib.mkIf cfg.enable {
-    imports = [
-      (modulesPath + "/installer/scan/not-detected.nix")
-
-      "${inputs.nixos-hardware}/common/cpu/amd"
-      "${inputs.nixos-hardware}../../../common/cpu/amd/pstate.nix"
-      "${inputs.nixos-hardware}../../../common/gpu/amd"
-      "${inputs.nixos-hardware}../../../common/gpu/nvidia/prime-sync.nix"
-      "${inputs.nixos-hardware}../../../common/pc/laptop"
-      "${inputs.nixos-hardware}../../../common/pc/laptop/ssd"
-    ];
-
-    hardware.nvidia = {
-      modesetting.enable = true;
-      prime = {
-        amdgpuBusId = "PCI:5:0:0";
-        nvidiaBusId = "PCI:1:0:0";
-      };
-    };
-    
-  environment.systemPackages = with pkgs; [
-    vulkan-tools
-  ];
-
-  /* boot */
-  boot.initrd.availableKernelModules = [ "nvme" "xhci_pci" "usb_storage" "usbhid" "sd_mod" ];
-  boot.initrd.kernelModules = [ "dm-snapshot" "amdgpu" ];
-  boot.kernelModules = [ "kvm-amd" ];
-  boot.extraModulePackages = [ ];
-
-  /* */
-  networking.useDHCP = lib.mkDefault true;
-
-  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
-
-  /* cpu */
-  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
-
-  /* nvidia */
-  services.xserver.videoDrivers = [ 
-    "nvidia" 
-    #"amdgpu"  # NOTE: probably useles with nvidia optimus prime
-    #"nouveau" # NOTE: open source nvidia
-  ];
-
-  hardware.opengl = {
-    enable = true;
-    driSupport = true;
-    driSupport32Bit = true;
-    extraPackages = with pkgs; [
-      vulkan-loader
-      vulkan-validation-layers
-      vulkan-extension-layer
-      amdvlk
-
-    ];
-    extraPackages32 = with pkgs; [
-      pkgsi686Linux.vulkan-loader
-      pkgsi686Linux.vulkan-validation-layers
-      pkgsi686Linux.vulkan-extension-layer
-      driversi686Linux.amdvlk
-    ];
-  };
-
-  #environment.variables.VK_DRIVER_FILES=/run/opengl-driver/share/vulkan/icd.d/nvidia_icd.x86_64.json;
-  #environment.sessionVariables.VK_DRIVER_FILES = "/run/opengl-driver/share/vulkan/icd.d/nvidia_icd.x86_64.json";
-
-  #environment.sessionVariables = rec {
-  #  VK_ICD_FILENAMES = 
-  #    "${config.hardware.nvidia.package}/share/vulkan/icd.d/nvidia_icd.x86_64.json";
-
-  #    #:${config.environment.variables.VK_ICD_FILENAMES or ""}";
-  #};
-
-
-  hardware.nvidia = {
-    # Modesetting is required.
-    modesetting.enable = true;
-
-    # Nvidia power management. Experimental, and can cause sleep/suspend to fail.
-    # Enable this if you have graphical corruption issues or application crashes after waking
-    # up from sleep. This fixes it by saving the entire VRAM memory to /tmp/ instead 
-    # of just the bare essentials.
-    powerManagement.enable = false;
-
-    # Fine-grained power management. Turns off GPU when not in use.
-    # Experimental and only works on modern Nvidia GPUs (Turing or newer).
-    powerManagement.finegrained = false;
-
-    # Use the NVidia open source kernel module (not to be confused with the
-    # independent third-party "nouveau" open source driver).
-    # Support is limited to the Turing and later architectures. Full list of 
-    # supported GPUs is at: 
-    # https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus 
-    # Only available from driver 515.43.04+
-    # Currently alpha-quality/buggy, so false is currently the recommended setting.
-    open = false;
-
-    # Enable the Nvidia settings menu,
-    # accessible via `nvidia-settings`.
-    nvidiaSettings = true;
-
-    # nvidia package overwrive
-    package = config.boot.kernelPackages.nvidiaPackages.stable;
-
-  };
-
-  /* sound */
-  hardware.pulseaudio.enable = true;
-  hardware.pulseaudio.support32Bit = true;
-
-  };
-}
diff --git a/nixos/system/devvm-manual/devvm-manual.nix b/nixos/system/devvm-manual/devvm-manual.nix
index c7d6140..df17244 100644
--- a/nixos/system/devvm-manual/devvm-manual.nix
+++ b/nixos/system/devvm-manual/devvm-manual.nix
@@ -18,9 +18,10 @@
   hectic = {
     archetype.dev.enable = true;
     hardware.hetzner-cloud.enable = true;
+    hardware.lenovo-ideapad-15arh7.enable = true;
   };
  
-  environment.systemPackages = with pkgs.writers; [
+  environment.systemPackages = with pkgs.hectic.writers; [
     (writeMinCBin "minc-hello-world" ["<stdio.h>"] /*c*/ ''
       printf("hello world\n");
     '')
diff --git a/package/default.nix b/package/default.nix
index 40aba2c..916c636 100644
--- a/package/default.nix
+++ b/package/default.nix
@@ -14,24 +14,6 @@
       name = "extension-builder";
       path = ./buildPostgresqlExtension.nix;
     }));
-  buildHemarExt = pkgs: versionSuffix: let
-      postgresql = pkgs."postgresql_${versionSuffix}";
-      c-hectic = self.packages.${pkgs.system}.c-hectic;
-  in buildPostgresqlExtension pkgs {
-      stdenv = pkgs.clangStdenv;
-      inherit postgresql;
-    } {
-      pname = "hemar";
-      version = "0.1";
-      src = ./c/hemar;
-      nativeBuildInputs = (with pkgs; [pkg-config]) ++ [ c-hectic ];
-      dontShrinkRPath = true;
-      postFixup = ''
-        echo ">>> postFixup running..."
-        ${pkgs.patchelf}/bin/patchelf --set-rpath ${c-hectic}/lib $out/lib/hemar.so
-      '';
-      preInstall = ''mkdir $out'';
-    };
   buildPgrxExtension = pkgs: 
     pkgs.callPackage (import (builtins.path {
       name = "extension-builder";
@@ -260,17 +242,14 @@ in {
   shellplot                    = pkgs.callPackage ./shellplot                         {};
   sops                         = pkgs.callPackage ./sops.nix                          {};
   onlinepubs2man               = pkgs.callPackage ./onlinepubs2man                    {};
-  pg-17-ext-hemar              = buildHemarExt     pkgs "17";
   pg-17-ext-http               = buildHttpExt      pkgs "17";
   pg-17-ext-smtp-client        = buildSmtpExt      pkgs "17";
   pg-17-ext-plhaskell          = buildPlHaskellExt pkgs "17";
   pg-17-ext-plsh               = buildPlShExt      pkgs "17";
-  pg-16-ext-hemar              = buildHemarExt     pkgs "16";
   pg-16-ext-http               = buildHttpExt      pkgs "16";
   pg-16-ext-smtp-client        = buildSmtpExt      pkgs "16";
   pg-16-ext-plhaskell          = buildPlHaskellExt pkgs "16";
   pg-16-ext-plsh               = buildPlShExt      pkgs "16";
-  pg-15-ext-hemar              = buildHemarExt     pkgs "15";
   pg-15-ext-http               = buildHttpExt      pkgs "15";
   pg-15-ext-smtp-client        = buildSmtpExt      pkgs "15";
   pg-15-ext-plhaskell          = buildPlHaskellExt pkgs "15";
diff --git a/package/sentinèlla/colors.sh b/package/sentinèlla/colors.sh
new file mode 100644
index 0000000..627aad5
--- /dev/null
+++ b/package/sentinèlla/colors.sh
@@ -0,0 +1,54 @@
+NC='\033[0m'
+
+# Regular text colors
+BLACK='\033[30m'
+RED='\033[31m'
+GREEN='\033[32m'
+YELLOW='\033[33m'
+BLUE='\033[34m'
+MAGENTA='\033[35m'
+CYAN='\033[36m'
+WHITE='\033[37m'
+
+# Bright text colors
+BBLACK='\033[90m'
+BRED='\033[91m'
+BGREEN='\033[92m'
+BYELLOW='\033[93m'
+BBLUE='\033[94m'
+BMAGENTA='\033[95m'
+BCYAN='\033[96m'
+BWHITE='\033[97m'
+
+# Background colors
+BG_BLACK='\033[40m'
+BG_RED='\033[41m'
+BG_GREEN='\033[42m'
+BG_YELLOW='\033[43m'
+BG_BLUE='\033[44m'
+BG_MAGENTA='\033[45m'
+BG_CYAN='\033[46m'
+BG_WHITE='\033[47m'
+
+# Bright background colors
+BG_BBLACK='\033[100m'
+BG_BRED='\033[101m'
+BG_BGREEN='\033[102m'
+BG_BYELLOW='\033[103m'
+BG_BBLUE='\033[104m'
+BG_BMAGENTA='\033[105m'
+BG_BCYAN='\033[106m'
+BG_BWHITE='\033[107m'
+
+# Text effects
+RESET='\033[0m'
+BOLD='\033[1m'
+DIM='\033[2m'
+ITALIC='\033[3m'
+UNDERLINE='\033[4m'
+BLINK='\033[5m'
+INVERSE='\033[7m'
+HIDDEN='\033[8m'
+STRIKE='\033[9m'
+
+: "$NC" "$BLACK" "$RED" "$GREEN" "$YELLOW" "$BLUE" "$MAGENTA" "$CYAN" "$WHITE" "$BBLACK" "$BRED" "$BGREEN" "$BYELLOW" "$BBLUE" "$BMAGENTA" "$BCYAN" "$BWHITE" "$BG_BLACK" "$BG_RED" "$BG_GREEN" "$BG_YELLOW" "$BG_BLUE" "$BG_MAGENTA" "$BG_CYAN" "$BG_WHITE" "$BG_BBLACK" "$BG_BRED" "$BG_BGREEN" "$BG_BYELLOW" "$BG_BBLUE" "$BG_BMAGENTA" "$BG_BCYAN" "$BG_BWHITE" "$RESET" "$BOLD" "$DIM" "$ITALIC" "$UNDERLINE" "$BLINK" "$INVERSE" "$HIDDEN" "$STRIKE"
diff --git a/package/sentinèlla/default.nix b/package/sentinèlla/default.nix
index fa6d8fb..4ffb446 100644
--- a/package/sentinèlla/default.nix
+++ b/package/sentinèlla/default.nix
@@ -1,4 +1,4 @@
-{ symlinkJoin, writeShellApplication, socat, dash, hectic, curl, gawk }:
+{ symlinkJoin, writeTextFile, socat, dash, hectic, curl, gawk }:
 let
   shell = "${dash}/bin/dash";
   bashOptions = [
@@ -31,7 +31,12 @@ let
     inherit shell bashOptions;
     name = "sentinel";
     runtimeInputs = [ hectic.shellplot curl ];
-    text = builtins.readFile ./sentinel.sh;
+
+    text = ''
+      ${builtins.readFile ./log.sh}
+      ${builtins.readFile ./colors.sh}
+      ${builtins.readFile ./sentinel.sh}
+    '';
   };
 in
 symlinkJoin {
diff --git a/package/sentinèlla/log.sh b/package/sentinèlla/log.sh
new file mode 100644
index 0000000..96ca706
--- /dev/null
+++ b/package/sentinèlla/log.sh
@@ -0,0 +1,21 @@
+#!/bin/dash
+
+log() {
+    level="$1"; shift
+    case "$level" in
+        trace)   color="$MAGENTA"  ;;
+        debug)   color="$BLUE"     ;;
+        info)    color="$GREEN"    ;;
+        notice)  color="$CYAN"     ;;
+        warn)    color="$YELLOW"   ;;
+        error)   color="$RED"      ;;
+        *)       color="$WHITE"    ;;
+    esac
+
+
+
+    # shellcheck disable=SC1003
+    fmt="$(printf "%s" "$1" | sed 's/\\033\[0m/''\'"$color"'/g')"
+    shift
+    printf "%b\n" "$color$fmt$NC" "$@"
+}
diff --git a/package/sentinèlla/sentinel.sh b/package/sentinèlla/sentinel.sh
index 726b149..683ea98 100644
--- a/package/sentinèlla/sentinel.sh
+++ b/package/sentinèlla/sentinel.sh
@@ -3,23 +3,35 @@
 # Env:
 #   SERVERS="http://host1:8080,http://host2:8080"
 #   TOKENS="-,b64token2"             # CSV aligned with SERVERS; "-" means no auth
-#   TOKEN="..."                      # Telegram bot token
-#   CHAT_ID="..."                    # Telegram chat id
+#   TG_TOKEN="..."                   # Telegram bot token
+#   TG_CHAT_ID="..."                 # Telegram chat id
 #   TIMEOUT=5                        # curl timeout seconds (default 5)
 #   POLLING_INTERVAL_SEC=3           # default 3
-#   STATE_DIR=/tmp/sentinel          # default /tmp/sentinel
+#   STATE_DIR=/var/lib/sentinel      # default /var/lib/sentinel
+#   SPAM=0                           # if 1 will notify every poling, default 0
 
 set -eu
 
 TIMEOUT=${TIMEOUT:-5}
 POLLING_INTERVAL_SEC=${POLLING_INTERVAL_SEC:-3}
-STATE_DIR=${STATE_DIR:-$(mktemp -d)}
 SERVERS=${SERVERS:-}
 TOKENS=${TOKENS:-}
 TOKEN=${TOKEN:-}
 CHAT_ID=${CHAT_ID:-}
+SPAM=${SPAM:-0}
+
+STATE_DIR=${STATE_DIR:-/var/lib/sentinel}
+mkdir -p "$STATE_DIR" 2>/dev/null || {
+  # TODO: some sort of message?
+  STATE_DIR="$HOME/.local/$(basename "$STATE_DIR")"
+  mkdir -p "$STATE_DIR"
+}
+
+mkdir -p "$STATE_DIR" 2>/dev/null || mkdir -p "$HOME/.local/$(basename "$STATE_DIR")"
 
 [ -n "$SERVERS" ] || { printf >&2 'SERVERS not set\n'; exit 1; }
+[ -n "$TOKEN" ]   || { printf >&2 'TOKEN not set\n';   exit 1; }
+[ -n "$CHAT_ID" ] || { printf >&2 'CHAT_ID not set\n'; exit 1; }
 
 # If TOKENS unset, synthesize "-" for each server
 if [ -z "$TOKENS" ]; then
@@ -27,13 +39,11 @@ if [ -z "$TOKENS" ]; then
   TOKENS=$(awk -v n="$n" 'BEGIN{for(i=1;i<=n;i++){printf("-"); if(i<n)printf(",")}}')
 fi
 
-mkdir -p "$STATE_DIR"
-
 # --- helpers ---
 
-# get_csv VAR idx -> echo idx-th field (1-based) from CSV string VAR
+# get_csv(csv_variable, index)
+# echo idx-th field (1-based) from CSV string VAR
 get_csv() {
-  # shellcheck disable=SC2001
   printf '%s' "$1" | sed 's/,/\n/g' | awk -v n="$2" 'NR==n{print; exit}'
 }
 
@@ -48,6 +58,7 @@ notify() {
   fi
 }
 
+# sid(text)
 sid() { printf '%s' "$1" | cksum | awk '{print $1}'; }
 
 parse_summary() {
@@ -65,6 +76,7 @@ list_failures() {
 
 # --- main loop ---
 while :; do
+  log info "pooling ${WHITE}${POLLING_INTERVAL_SEC}${NC} sec"
   i=1
   while :; do
     srv=$(get_csv "$SERVERS" "$i") || true
@@ -79,6 +91,8 @@ while :; do
     code=$(sh -c "curl -sS -m \"$TIMEOUT\" -w '%{http_code}' -o \"$tmpb\" $auth_h \"$url\"") || code="000"
     body=$(cat "$tmpb"); rm -f "$tmpb"
 
+    log info "server ${WHITE}${srv}${NC}\ncode ${WHITE}${code}${NC}\nbody ${WHITE}${body}${NC}"
+
     ok="down"; tot=0; good=0
     if [ "$code" = "200" ]; then
       s=$(printf '%s' "$body" | parse_summary || true)