diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
index 232f10d7c24d..6430a344ba24 100644
--- a/nixos/tests/all-tests.nix
+++ b/nixos/tests/all-tests.nix
@@ -941,7 +941,6 @@ in {
   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 {};
diff --git a/nixos/tests/promscale.nix b/nixos/tests/promscale.nix
deleted file mode 100644
index da18628f2482..000000000000
--- a/nixos/tests/promscale.nix
+++ /dev/null
@@ -1,60 +0,0 @@
-# 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 ${test-sql}"))
-          machine.succeed("sudo -u postgres psql promscale -c 'SHOW shared_preload_libraries;' | grep promscale")
-          machine.succeed(
-            "promscale --db.name promscale --db.password promscale --db.user promscale --db.ssl-mode allow --startup.install-extensions --startup.only"
-          )
-      machine.succeed("sudo -u postgres psql promscale -c 'SELECT ps_trace.get_trace_retention_period();' | grep '(1 row)'")
-      machine.shutdown()
-    '';
-  };
-  #version 15 is not supported yet
-  applicablePostgresqlVersions = filterAttrs (_: value: versionAtLeast value.version "12" && !(versionAtLeast value.version "15")) postgresql-versions;
-in
-mapAttrs'
-  (name: package: {
-    inherit name;
-    value = make-postgresql-test name package;
-  })
-  applicablePostgresqlVersions
diff --git a/pkgs/development/tools/rust/cargo-pgx/0_6_1.nix b/pkgs/development/tools/rust/cargo-pgx/0_6_1.nix
deleted file mode 100644
index 8dbc22cdfd49..000000000000
--- a/pkgs/development/tools/rust/cargo-pgx/0_6_1.nix
+++ /dev/null
@@ -1,26 +0,0 @@
-{ lib, stdenv, fetchCrate, rustPlatform, pkg-config, openssl, Security }:
-
-rustPlatform.buildRustPackage rec {
-  pname = "cargo-pgx";
-  version = "0.6.1";
-
-  src = fetchCrate {
-    inherit version pname;
-    sha256 = "sha256-O4eHVbJBudybsPab+zr2eXnfheREMqLAHAKm2GDbfrs=";
-  };
-
-  cargoSha256 = "sha256-MucGrA3qXgJOcT2LMNmoNOhQi8QA3LuqgZEHKycLCCo=";
-
-  nativeBuildInputs = [ pkg-config ];
-
-  buildInputs = [ openssl ]
-    ++ lib.optionals stdenv.isDarwin [ Security ];
-
-  meta = with lib; {
-    description = "Cargo subcommand for ‘pgx’ to make Postgres extension development easy";
-    mainProgram = "cargo-pgx";
-    homepage = "https://github.com/tcdi/pgx/tree/v${version}/cargo-pgx";
-    license = licenses.mit;
-    maintainers = with maintainers; [ typetetris ];
-  };
-}
diff --git a/pkgs/development/tools/rust/cargo-pgx/0_7_1.nix b/pkgs/development/tools/rust/cargo-pgx/0_7_1.nix
deleted file mode 100644
index 6dd8a0661bed..000000000000
--- a/pkgs/development/tools/rust/cargo-pgx/0_7_1.nix
+++ /dev/null
@@ -1,26 +0,0 @@
-{ lib, stdenv, fetchCrate, rustPlatform, pkg-config, openssl, Security }:
-
-rustPlatform.buildRustPackage rec {
-  pname = "cargo-pgx";
-  version = "0.7.1";
-
-  src = fetchCrate {
-    inherit version pname;
-    sha256 = "sha256-t/gdlrBeP6KFkBFJiZUa8KKVJVYMf6753vQGKJdytss=";
-  };
-
-  cargoSha256 = "sha256-muce9wT4LAJmfNLWWEShARnpZgglXe/KrfxlitmGgXk=";
-
-  nativeBuildInputs = [ pkg-config ];
-
-  buildInputs = [ openssl ]
-    ++ lib.optionals stdenv.isDarwin [ Security ];
-
-  meta = with lib; {
-    description = "Cargo subcommand for ‘pgx’ to make Postgres extension development easy";
-    mainProgram = "cargo-pgx";
-    homepage = "https://github.com/tcdi/pgx/tree/v${version}/cargo-pgx";
-    license = licenses.mit;
-    maintainers = with maintainers; [ typetetris ];
-  };
-}
diff --git a/pkgs/development/tools/rust/cargo-pgx/0_7_4.nix b/pkgs/development/tools/rust/cargo-pgx/0_7_4.nix
deleted file mode 100644
index 0f2b3ef35c22..000000000000
--- a/pkgs/development/tools/rust/cargo-pgx/0_7_4.nix
+++ /dev/null
@@ -1,26 +0,0 @@
-{ lib, stdenv, fetchCrate, rustPlatform, pkg-config, openssl, Security }:
-
-rustPlatform.buildRustPackage rec {
-  pname = "cargo-pgx";
-  version = "0.7.4";
-
-  src = fetchCrate {
-    inherit version pname;
-    sha256 = "sha256-uyMWfxI+A8mws8oZFm2pmvr7hJgSNIb328SrVtIDGdA=";
-  };
-
-  cargoSha256 = "sha256-RgpL/hJdfrtLDANs5U53m5a6aEEAhZ9SFOIM7V8xABM=";
-
-  nativeBuildInputs = [ pkg-config ];
-
-  buildInputs = [ openssl ]
-    ++ lib.optionals stdenv.isDarwin [ Security ];
-
-  meta = with lib; {
-    description = "Cargo subcommand for ‘pgx’ to make Postgres extension development easy";
-    mainProgram = "cargo-pgx";
-    homepage = "https://github.com/tcdi/pgx/tree/v${version}/cargo-pgx";
-    license = licenses.mit;
-    maintainers = with maintainers; [ typetetris ];
-  };
-}
diff --git a/pkgs/development/tools/rust/cargo-pgx/buildPgxExtension.nix b/pkgs/development/tools/rust/cargo-pgx/buildPgxExtension.nix
deleted file mode 100644
index 4b4f7f9d7486..000000000000
--- a/pkgs/development/tools/rust/cargo-pgx/buildPgxExtension.nix
+++ /dev/null
@@ -1,160 +0,0 @@
-# preBuildAndTest and some small other bits
-# taken from https://github.com/tcdi/pgx/blob/v0.4.5/nix/extension.nix
-# (but now heavily modified)
-# which uses MIT License with the following license file
-#
-# MIT License
-#
-# Portions Copyright 2019-2021 ZomboDB, LLC.
-# Portions Copyright 2021-2022 Technology Concepts & Design, Inc. <support@tcdi.com>.
-# All rights reserved.
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
-
-{ lib
-, cargo-pgx
-, pkg-config
-, rustPlatform
-, stdenv
-, Security
-, writeShellScriptBin
-}:
-
-# The idea behind: Use it mostly like rustPlatform.buildRustPackage and so
-# we hand most of the arguments down.
-#
-# Additional arguments are:
-#   - `postgresql` postgresql package of the version of postgresql this extension should be build for.
-#                  Needs to be the build platform variant.
-#   - `useFakeRustfmt` Whether to use a noop fake command as rustfmt. cargo-pgx tries to call rustfmt.
-#                      If the generated rust bindings aren't needed to use the extension, its a
-#                      unnecessary and heavy dependency. If you set this to true, you also
-#                      have to add `rustfmt` to `nativeBuildInputs`.
-
-{ buildAndTestSubdir ? null
-, buildType ? "release"
-, buildFeatures ? [ ]
-, cargoBuildFlags ? [ ]
-, postgresql
-# cargo-pgx calls rustfmt on generated bindings, this is not strictly necessary, so we avoid the
-# dependency here. Set to false and provide rustfmt in nativeBuildInputs, if you need it, e.g.
-# if you include the generated code in the output via postInstall.
-, useFakeRustfmt ? true
-, ...
-} @ args:
-let
-  rustfmtInNativeBuildInputs = lib.lists.any (dep: lib.getName dep == "rustfmt") (args.nativeBuildInputs or []);
-in
-
-assert lib.asserts.assertMsg ((args.installPhase or "") == "")
-  "buildPgxExtensions overwrites the installPhase, so providing one does nothing";
-assert lib.asserts.assertMsg ((args.buildPhase or "") == "")
-  "buildPgxExtensions overwrites the buildPhase, so providing one does nothing";
-assert lib.asserts.assertMsg (useFakeRustfmt -> !rustfmtInNativeBuildInputs)
-  "The parameter useFakeRustfmt is set to true, but rustfmt is included in nativeBuildInputs. Either set useFakeRustfmt to false or remove rustfmt from nativeBuildInputs.";
-assert lib.asserts.assertMsg (!useFakeRustfmt -> rustfmtInNativeBuildInputs)
-  "The parameter useFakeRustfmt is set to false, but rustfmt is not included in nativeBuildInputs. Either set useFakeRustfmt to true or add rustfmt from nativeBuildInputs.";
-
-let
-  fakeRustfmt = writeShellScriptBin "rustfmt" ''
-    exit 0
-    '';
-  maybeDebugFlag = lib.optionalString (buildType != "release") "--debug";
-  maybeEnterBuildAndTestSubdir = lib.optionalString (buildAndTestSubdir != null) ''
-    export CARGO_TARGET_DIR="$(pwd)/target"
-    pushd "${buildAndTestSubdir}"
-  '';
-  maybeLeaveBuildAndTestSubdir = lib.optionalString (buildAndTestSubdir != null) "popd";
-
-  pgxPostgresMajor = lib.versions.major postgresql.version;
-  preBuildAndTest = ''
-    export PGX_HOME=$(mktemp -d)
-    export PGDATA="$PGX_HOME/data-${pgxPostgresMajor}/"
-    cargo-pgx pgx init "--pg${pgxPostgresMajor}" ${postgresql}/bin/pg_config
-    echo "unix_socket_directories = '$(mktemp -d)'" > "$PGDATA/postgresql.conf"
-
-    # This is primarily for Mac or other Nix systems that don't use the nixbld user.
-    export USER="$(whoami)"
-    pg_ctl start
-    createuser -h localhost --superuser --createdb "$USER" || true
-    pg_ctl stop
-  '';
-
-  argsForBuildRustPackage = builtins.removeAttrs args [ "postgresql" "useFakeRustfmt" ];
-
-  # so we don't accidentally `(rustPlatform.buildRustPackage argsForBuildRustPackage) // { ... }` because
-  # we forgot parentheses
-  finalArgs = argsForBuildRustPackage // {
-    buildInputs = (args.buildInputs or [ ]) ++ lib.optionals stdenv.isDarwin [ Security ];
-
-    nativeBuildInputs = (args.nativeBuildInputs or [ ]) ++ [
-      cargo-pgx
-      postgresql
-      pkg-config
-      rustPlatform.bindgenHook
-    ] ++ lib.optionals useFakeRustfmt [ fakeRustfmt ];
-
-    buildPhase = ''
-      runHook preBuild
-
-      echo "Executing cargo-pgx buildPhase"
-      ${preBuildAndTest}
-      ${maybeEnterBuildAndTestSubdir}
-
-      NIX_PGLIBDIR="${postgresql}/lib" \
-      PGX_BUILD_FLAGS="--frozen -j $NIX_BUILD_CORES ${builtins.concatStringsSep " " cargoBuildFlags}" \
-      cargo-pgx pgx package \
-        --pg-config ${postgresql}/bin/pg_config \
-        ${maybeDebugFlag} \
-        --features "${builtins.concatStringsSep " " buildFeatures}" \
-        --out-dir "$out"
-
-      ${maybeLeaveBuildAndTestSubdir}
-
-      runHook postBuild
-    '';
-
-    preCheck = preBuildAndTest + args.preCheck or "";
-
-    installPhase = ''
-      runHook preInstall
-
-      echo "Executing buildPgxExtension install"
-
-      ${maybeEnterBuildAndTestSubdir}
-
-      cargo-pgx pgx stop all
-
-      mv $out/${postgresql}/* $out
-      rm -rf $out/nix
-
-      ${maybeLeaveBuildAndTestSubdir}
-
-      runHook postInstall
-    '';
-
-    PGX_PG_SYS_SKIP_BINDING_REWRITE = "1";
-    CARGO_BUILD_INCREMENTAL = "false";
-    RUST_BACKTRACE = "full";
-
-    checkNoDefaultFeatures = true;
-    checkFeatures = (args.checkFeatures or [ ]) ++ [ "pg_test pg${pgxPostgresMajor}" ];
-  };
-in
-rustPlatform.buildRustPackage finalArgs
diff --git a/pkgs/servers/sql/postgresql/ext/default.nix b/pkgs/servers/sql/postgresql/ext/default.nix
index af78f47eebca..6166bda6b41d 100644
--- a/pkgs/servers/sql/postgresql/ext/default.nix
+++ b/pkgs/servers/sql/postgresql/ext/default.nix
@@ -99,8 +99,6 @@ self: super: {
 
     pg_uuidv7 = super.callPackage ./pg_uuidv7.nix { };
 
-    promscale_extension = super.callPackage ./promscale_extension.nix { };
-
     repmgr = super.callPackage ./repmgr.nix { };
 
     rum = super.callPackage ./rum.nix { };
diff --git a/pkgs/servers/sql/postgresql/ext/promscale_extension.nix b/pkgs/servers/sql/postgresql/ext/promscale_extension.nix
deleted file mode 100644
index 80de9315d985..000000000000
--- a/pkgs/servers/sql/postgresql/ext/promscale_extension.nix
+++ /dev/null
@@ -1,59 +0,0 @@
-{ 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";
-  };
-}
diff --git a/pkgs/servers/sql/postgresql/generic.nix b/pkgs/servers/sql/postgresql/generic.nix
index 7f9e561f877b..b1bd2a83fa45 100644
--- a/pkgs/servers/sql/postgresql/generic.nix
+++ b/pkgs/servers/sql/postgresql/generic.nix
@@ -24,7 +24,6 @@ let
       # JIT
       , jitSupport
       , nukeReferences, patchelf, llvmPackages
-      , makeRustPlatform, buildPgxExtension, cargo, rustc
 
       # PL/Python
       , pythonSupport ? false
@@ -235,13 +234,6 @@ let
           inherit (llvmPackages) llvm;
           postgresql = this;
           stdenv = stdenv';
-          buildPgxExtension = buildPgxExtension.override {
-            stdenv = stdenv';
-            rustPlatform = makeRustPlatform {
-              stdenv = stdenv';
-              inherit rustc cargo;
-            };
-          };
         };
         newSelf = self // scope;
         newSuper = { callPackage = newScope (scope // this.pkgs); };
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f7d53d5bcae2..541014645520 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -16744,19 +16744,6 @@ with pkgs;
   cargo-outdated = callPackage ../development/tools/rust/cargo-outdated {
     inherit (darwin.apple_sdk.frameworks) CoreFoundation CoreServices Security SystemConfiguration;
   };
-  cargo-pgx_0_6_1 = callPackage ../development/tools/rust/cargo-pgx/0_6_1.nix {
-    inherit (darwin.apple_sdk.frameworks) Security;
-  };
-  cargo-pgx_0_7_1 = callPackage ../development/tools/rust/cargo-pgx/0_7_1.nix {
-    inherit (darwin.apple_sdk.frameworks) Security;
-  };
-  cargo-pgx_0_7_4 = callPackage ../development/tools/rust/cargo-pgx/0_7_4.nix {
-    inherit (darwin.apple_sdk.frameworks) Security;
-  };
-  cargo-pgx = cargo-pgx_0_7_4;
-  buildPgxExtension = callPackage ../development/tools/rust/cargo-pgx/buildPgxExtension.nix {
-    inherit (darwin.apple_sdk.frameworks) Security;
-  };
   inherit (callPackages ../development/tools/rust/cargo-pgrx { })
     cargo-pgrx_0_10_2
     cargo-pgrx_0_11_2