postgresqlPackages.promscale_extension: remove deprecated and broken package

postgresql14Packages.promscale_extension breaks with:

Error:
0: `pgx-0.6.1` shouldn't be used with `cargo-pgx-0.7.4`,
please use `pgx = "~0.7.4"` in your `Cargo.toml`.

However, pinning cargo-pgx to 0_6_1 via the following

buildPgxExtension.override { cargo-pgx = cargo-pgx_0_6_1; }

does not work either, because the build then fails with:

thread 'main' panicked at /build/promscale_extension-0.8.0-vendor.tar.gz/proc-macro2/src/fallback.rs:756:9:
"__mbstate_t_union_(unnamed_at_/nix/store/ij144ma6vs8acil8r9hgr8xkb1dp9azg-glibc-2_39-5-dev/include/bits/types/__mbstate_t_h_16_3)" is not a valid Ident

This seems to be related to [1], which indicates that this is a
problem with newer LLVM / clang toolchains.

At the same time th upstream package is deprecated / archived since
the 2nd of April 2024 [2]. Additionally this package is unfree and
thus very unlikely to be forked. Since we can't expect this to be
fixed, the only sensible thing to do is to remove the package.

[1]: https://github.com/rust-lang/rust-bindgen/issues/2312
[2]: https://github.com/timescale/promscale/issues/1836

nixos/tests/all-tests.nix

···
   tiddlywiki = handleTest ./tiddlywiki.nix {};
   tigervnc = handleTest ./tigervnc.nix {};
   timescaledb = handleTest ./timescaledb.nix {};
-  promscale = handleTest ./promscale.nix {};
   timezone = handleTest ./timezone.nix {};
   tinc = handleTest ./tinc {};
   tinydns = handleTest ./tinydns.nix {};

nixos/tests/promscale.nix

···
-# mostly copied from ./timescaledb.nix which was copied from ./postgresql.nix
-# as it seemed unapproriate to test additional extensions for postgresql there.
-
-{ system ? builtins.currentSystem
-, config ? { }
-, pkgs ? import ../.. { inherit system config; }
-}:
-
-with import ../lib/testing-python.nix { inherit system pkgs; };
-with pkgs.lib;
-
-let
-  postgresql-versions = import ../../pkgs/servers/sql/postgresql pkgs;
-  test-sql = pkgs.writeText "postgresql-test" ''
-    CREATE USER promscale SUPERUSER PASSWORD 'promscale';
-    CREATE DATABASE promscale OWNER promscale;
-  '';
-
-  make-postgresql-test = postgresql-name: postgresql-package: makeTest {
-    name = postgresql-name;
-    meta = with pkgs.lib.maintainers; {
-      maintainers = [ anpin ];
-    };
-
-    nodes.machine = { config, pkgs, ... }:
-      {
-        services.postgresql = {
-          enable = true;
-          package = postgresql-package;
-          extraPlugins = ps: with ps; [
-            timescaledb
-            promscale_extension
-          ];
-          settings = { shared_preload_libraries = "timescaledb, promscale"; };
-        };
-        environment.systemPackages = with pkgs; [ promscale ];
-      };
-
-    testScript = ''
-      machine.start()
-      machine.wait_for_unit("postgresql")
-      with subtest("Postgresql with extensions timescaledb and promscale is available just after unit start"):
-          print(machine.succeed("sudo -u postgres psql -f ${test-sql}"))
-          machine.succeed("sudo -u postgres psql promscale -c 'SHOW shared_preload_libraries;' | grep promscale")
-          machine.succeed(
-            "promscale --db.name promscale --db.password promscale --db.user promscale --db.ssl-mode allow --startup.install-extensions --startup.only"
-          )
-      machine.succeed("sudo -u postgres psql promscale -c 'SELECT ps_trace.get_trace_retention_period();' | grep '(1 row)'")
-      machine.shutdown()
-    '';
-  };
-  #version 15 is not supported yet
-  applicablePostgresqlVersions = filterAttrs (_: value: versionAtLeast value.version "12" && !(versionAtLeast value.version "15")) postgresql-versions;
-in
-mapAttrs'
-  (name: package: {
-    inherit name;
-    value = make-postgresql-test name package;
-  })
-  applicablePostgresqlVersions

pkgs/servers/sql/postgresql/ext/default.nix

···
 
     pg_uuidv7 = super.callPackage ./pg_uuidv7.nix { };
 
-    promscale_extension = super.callPackage ./promscale_extension.nix { };
-
     repmgr = super.callPackage ./repmgr.nix { };
 
     rum = super.callPackage ./rum.nix { };

pkgs/servers/sql/postgresql/ext/promscale_extension.nix

···
-{ lib
-, fetchFromGitHub
-, fetchpatch
-, buildPgxExtension
-, postgresql
-, stdenv
-, nixosTests
-}:
-
-buildPgxExtension rec {
-  inherit postgresql;
-
-  pname = "promscale_extension";
-  version = "0.8.0";
-
-  src = fetchFromGitHub {
-    owner = "timescale";
-    repo = "promscale_extension";
-    rev = version;
-    sha256 = "sha256-vyEfQMGguHrHYdBEEmbev29L2uCa/4xL9DpGIniUwfI=";
-  };
-
-  cargoSha256 = "sha256-VK9DObkg4trcGUXxxISCd0zqU3vc1Qt6NxqpgKIARCQ=";
-
-  cargoPatches = [
-    # there is a duplicate definition in the lock file which fails to build with buildRustPackage
-    (fetchpatch {
-      name = "cargo-vendor.patch";
-      url = "https://github.com/timescale/promscale_extension/commit/3048bd959430e9abc2c1d5c772ab6b4fc1dc6a95.patch";
-      hash = "sha256-xTk4Ml8GN06QlJdrvAdVK21r30ZR/S83y5A5jJPdOw4=";
-    })
-  ];
-
-  preBuild = ''
-    patchShebangs create-upgrade-symlinks.sh extract-extension-version.sh
-    ## Hack to boostrap the build because some pgx commands require this file. It gets re-generated later.
-    cp templates/promscale.control ./promscale.control
-  '';
-  postInstall = ''
-    ln -s $out/lib/promscale-${version}.so $out/lib/promscale.so
-  '';
-  passthru.tests = {
-    promscale = nixosTests.promscale;
-  };
-
-  # tests take really long
-  doCheck = false;
-
-  meta = with lib; {
-    description = "Promscale is an open source observability backend for metrics and traces powered by SQL";
-    homepage = "https://github.com/timescale/promscale_extension";
-    maintainers = with maintainers; [ anpin ];
-    platforms = postgresql.meta.platforms;
-    license = licenses.unfree;
-
-    # as it needs to be used with timescaledb, simply use the condition from there
-    broken = versionAtLeast postgresql.version "15";
-  };
-}