heptabase: remove

- package is broken
- the last time its maintainer @luftmensch-luftmensch has interacted with it was 2025-07-27 in #428642, since then the r-ryantm prs have been merged by random committers
- the newest bot updates #509953 have been open and unmerged for more than 6 weeks
- 2 weeks ago at https://github.com/NixOS/nixpkgs/pull/509953#issuecomment-4467067787, i asked the maintainer to maintain their package by merging the bot updates to fix breakage after old releases are deleted upstream, no reaction
- honestly who cares about this proprietary ai slop

pkgs/by-name/he/heptabase/package.nix

@@ -1,39 +0,0 @@
-{
-  lib,
-  appimageTools,
-  fetchurl,
-}:
-let
-  pname = "heptabase";
-  version = "1.87.2";
-  src = fetchurl {
-    url = "https://github.com/heptameta/project-meta/releases/download/v${version}/Heptabase-${version}.AppImage";
-    hash = "sha256-6O6ksa0mCUoAfXW8jzh1n7zAfLZTA45va9o6J2ghKgU=";
-  };
-
-  appimageContents = appimageTools.extractType2 { inherit pname version src; };
-in
-appimageTools.wrapType2 {
-  inherit pname version src;
-
-  extraInstallCommands = ''
-    install -Dm444 ${appimageContents}/project-meta.desktop -T $out/share/applications/heptabase.desktop
-    install -m 444 -D ${appimageContents}/usr/share/icons/hicolor/0x0/apps/project-meta.png $out/share/icons/hicolor/512x512/apps/${pname}.png
-
-    substituteInPlace $out/share/applications/heptabase.desktop \
-      --replace-fail 'Exec=AppRun --no-sandbox %U' 'Exec=heptabase %U' \
-      --replace-fail 'Icon=project-meta' 'Icon=${pname}'
-
-  '';
-
-  meta = {
-    changelog = "https://github.com/heptameta/project-meta/releases/tag/v${version}";
-    description = "Visual note-taking tool for learning complex topics";
-    homepage = "https://heptabase.com/";
-    license = lib.licenses.unfree;
-    maintainers = with lib.maintainers; [ luftmensch-luftmensch ];
-    mainProgram = "heptabase";
-    platforms = [ "x86_64-linux" ];
-    sourceProvenance = with lib.sourceTypes; [ binaryNativeCode ];
-  };
-}

pkgs/top-level/aliases.nix

@@ -948,6 +948,7 @@ mapAliases {
   haxe_4_1 = throw "'haxe_4_1' has been removed as it reached its end of life. Migrate to 'haxe_4_3'.";
   helix-gpt = throw "helix-gpt was deprecated in January 2026 and has been since removed"; # Added 2026-02-05
   HentaiAtHome = throw "'HentaiAtHome' has been renamed to/replaced by 'hentai-at-home'"; # Converted to throw 2025-10-27
+  heptabase = throw "'heptabase' bas been removed due to lack of maintenance."; # Added 2026-05-31
   hiawatha = throw "hiawatha has been removed, since it is no longer actively supported upstream, nor well maintained in nixpkgs"; # Added 2025-09-10
   hibernate = throw "hibernate has been removed due to lack of maintenance"; # Added 2025-09-10
   hiddify-app = throw "hiddify-app has been removed, since it is unmaintained"; # Added 2025-08-20