diff --git a/configuration.nix b/configuration.nix
index 2519997..e075ce8 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -160,6 +160,7 @@ in
     wf-recorder
     xournalpp
     dnsutils
+    graphviz
     #network-manager-applet
     (clang-tools.override { llvmPackages = llvmPackages_16; }) # mainly for clang-format
     (emacsWithPackagesFromUsePackage {
diff --git a/emacs.el b/emacs.el
index d6924cb..9eac7fe 100755
--- a/emacs.el
+++ b/emacs.el
@@ -288,6 +288,7 @@
 (evil-set-leader 'normal " ")
 (evil-define-key 'normal 'global (kbd "<leader>f") 'find-file)
 (evil-define-key 'normal 'global (kbd "<leader>b") 'switch-to-buffer)
+(evil-define-key 'normal 'global (kbd "<leader>r") 'consult-ripgrep)
 
 ;; -------- Tools and environment --------
 
@@ -946,6 +947,19 @@ window, unless BACKGROUND (prefix-argument) is non-nil.
 (add-hook 'c++-mode-hook 'clang-format+-mode)
 (setq clang-format+-context 'buffer)
 
+;; for viewing C/C++ coverage reports
+(use-package cov)
+(setq cov-coverage-mode t)
+
+;; Make lcov.info file in the root of the project discoverable
+;; as the source of coverage
+(setq cov-coverage-file-paths
+   (list #'(lambda (file-dir file-name)
+             (let ((try (format "%s/lcov.info"
+                                (project-root (project-current t)))))
+               (and (file-exists-p try)
+                    (cons (file-truename try) 'lcov))))))
+
 ;; Zig
 
 (use-package zig-mode)
diff --git a/flake.lock b/flake.lock
index 7443820..ac1e9a3 100755
--- a/flake.lock
+++ b/flake.lock
@@ -11,11 +11,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1691865829,
-        "narHash": "sha256-5ceau8KBj7WpvfN/QHA0q+lZC3HjNK4CJ7O8c9m8THU=",
+        "lastModified": 1695464766,
+        "narHash": "sha256-u1rpF4ypWlZ80dvXWG9QpeMsbKNV1NdIrOUijnsqV2Y=",
         "owner": "nix-community",
         "repo": "emacs-overlay",
-        "rev": "e46cf9e07a3a6c4f065ace50976bf0f915c02d97",
+        "rev": "d073b90d4942257caa847becd802875391daadf5",
         "type": "github"
       },
       "original": {
@@ -29,11 +29,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1689068808,
-        "narHash": "sha256-6ixXo3wt24N/melDWjq70UuHQLxGV8jZvooRanIHXw0=",
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "919d646de7be200f3bf08cb76ae1f09402b6f9b4",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
         "type": "github"
       },
       "original": {
@@ -49,11 +49,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1692109167,
-        "narHash": "sha256-2GkXwsPfoPM1zdqMnyRArItgcTINhxR6aiKvzonz+Uo=",
+        "lastModified": 1692221510,
+        "narHash": "sha256-arGqL5Gu7U8fnFTkaK+1dy5f/F+vk/T45gTP1MzxS7Q=",
         "owner": "~knazarov",
         "repo": "git-plan",
-        "rev": "b10514e4bab6d935da3a7441014fd37ea1d7e5fd",
+        "rev": "9e39b2cdd29a4fdd7c43fc5f96d624c2bde11169",
         "type": "sourcehut"
       },
       "original": {
@@ -69,11 +69,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1692099905,
-        "narHash": "sha256-/pSusGhmIdSdAaywQRFA5dVbfdIzlWQTecM+E46+cJ0=",
+        "lastModified": 1695108154,
+        "narHash": "sha256-gSg7UTVtls2yO9lKtP0yb66XBHT1Fx5qZSZbGMpSn2c=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "2a6679aa9cc3872c29ba2a57fe1b71b3e3c5649f",
+        "rev": "07682fff75d41f18327a871088d20af2710d4744",
         "type": "github"
       },
       "original": {
@@ -90,11 +90,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1693772557,
-        "narHash": "sha256-VwHawtQ10MJ1gfASfE+iLBNrne1ryG/cUHVYDqjKejs=",
+        "lastModified": 1695674553,
+        "narHash": "sha256-gl/4yEfN0nsAhY/gBRO/GmxbbJZMQHXERm7Jrr2lJug=",
         "owner": "~knazarov",
         "repo": "knazarov.com",
-        "rev": "01b3ebb18ea306084719677a097001451b6a63e9",
+        "rev": "b851bb106e03996a1c00212986217db464b90424",
         "type": "sourcehut"
       },
       "original": {
@@ -105,11 +105,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1693420092,
-        "narHash": "sha256-zCYAQsvk0oF8NkvlBMAqJ2pCtQyfhy/cpUNEzBlsg5w=",
+        "lastModified": 1695479676,
+        "narHash": "sha256-YMcMXZ6xFA05egIwfUBh106AvaTHu3DBFQCnGuJx84Y=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "bca2c87fe83b889c4c671c1f72767607dcc2bcc9",
+        "rev": "805fee6f38428d7ef2ee59b36cf910003cabed71",
         "type": "github"
       },
       "original": {
@@ -120,11 +120,11 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1693341273,
-        "narHash": "sha256-wrsPjsIx2767909MPGhSIOmkpGELM9eufqLQOPxmZQg=",
+        "lastModified": 1695272228,
+        "narHash": "sha256-4uw2OdJPVyjdB+xcDst9SecrNIpxKXJ2usN3M5HVa7o=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "2ab91c8d65c00fd22a441c69bbf1bc9b420d5ea1",
+        "rev": "55ac2a9d2024f15c56adf20da505b29659911da8",
         "type": "github"
       },
       "original": {
@@ -177,11 +177,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1691830846,
-        "narHash": "sha256-ffR5maL8R4gsoF43YZRSBVzB7qYxzG+Ssjjktg80Wy4=",
+        "lastModified": 1695284550,
+        "narHash": "sha256-z9fz/wz9qo9XePEvdduf+sBNeoI9QG8NJKl5ssA8Xl4=",
         "owner": "Mic92",
         "repo": "sops-nix",
-        "rev": "5f5d9a3c8bc247eb574823b9f16a79e054dafe73",
+        "rev": "2f375ed8702b0d8ee2430885059d5e7975e38f78",
         "type": "github"
       },
       "original": {
diff --git a/nodes/knazarovcom/configuration.nix b/nodes/knazarovcom/configuration.nix
index 42928d6..b16fa5f 100644
--- a/nodes/knazarovcom/configuration.nix
+++ b/nodes/knazarovcom/configuration.nix
@@ -49,6 +49,7 @@
         ~*(MJ12bot|IonCrawl|webprosbot|Sogou|paloaltonetworks|CensysInspect) 1;
         ~*(DotBot|ev-crawler|InternetMeasurement|CheckMarkNetwork|panscient) 1;
         ~*(gdnplus|PunkMap|pdrlabs|SurdotlyBot|researchscan|serpstatbot) 1;
+        ~*(MegaIndex) 1;
       }
     '';
     virtualHosts = {