diff --git a/eslint.config.js b/eslint.config.js
index 07a1cde5a..9c33f141c 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -111,7 +111,6 @@ const backendConfig = {
     ...recommendedJsConfig,
     files: [
         'src/backend/**/*.{js,mjs,cjs,ts}',
-        'src/backend-core-0/**/*.{js,mjs,cjs,ts}',
         'src/putility/**/*.{js,mjs,cjs,ts}',
     ],
     ignores: [
@@ -151,7 +150,6 @@ const frontendConfig = {
     ignores: [
         'src/backend/**/*.{js,mjs,cjs,ts}',
         'extensions/**/*.{js,mjs,cjs,ts}',
-        'src/backend-core-0/**/*.{js,mjs,cjs,ts}',
         'submodules/**',
         '**/*.test.{js,ts,mts,mjs}',
         '**/*.min.js',
diff --git a/eslint/mandatory.eslint.config.js b/eslint/mandatory.eslint.config.js
index b3d13991e..a5e4ad215 100644
--- a/eslint/mandatory.eslint.config.js
+++ b/eslint/mandatory.eslint.config.js
@@ -49,7 +49,6 @@ export default defineConfig([
         files: [
             'src/backend/**/*.{js,mjc,cjs}',
             'extensions/**/*.{js,mjc,cjs}',
-            'src/backend-core-0/**/*.{js,mjc,cjs}',
         ],
         ignores: [
             'src/backend/src/services/database/sqlite_setup/**/*.js',
@@ -77,7 +76,6 @@ export default defineConfig([
         files: [
             'src/backend/**/*.{ts}',
             'extensions/**/*.{ts}',
-            'src/backend-core-0/**/*.{ts}',
         ],
         rules: mandatoryRules,
         languageOptions: {
diff --git a/package-lock.json b/package-lock.json
index cf994a5d0..84e0d4c4d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2257,10 +2257,6 @@
       "resolved": "src/backend",
       "link": true
     },
-    "node_modules/@heyputer/backend-core-0": {
-      "resolved": "src/backend-core-0",
-      "link": true
-    },
     "node_modules/@heyputer/gui": {
       "resolved": "src/gui",
       "link": true
@@ -15997,15 +15993,6 @@
         "vitest": "^4.0.14"
       }
     },
-    "src/backend-core-0": {
-      "name": "@heyputer/backend-core-0",
-      "version": "1.0.0",
-      "license": "AGPL-3.0-only",
-      "devDependencies": {
-        "webpack": "^5.88.2",
-        "webpack-cli": "^5.1.1"
-      }
-    },
     "src/backend/node_modules/@opentelemetry/api": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/@opentelemetry/api/-/api-1.4.1.tgz",
diff --git a/src/backend-core-0/README.md b/src/backend-core-0/README.md
deleted file mode 100644
index 1bd30f2d8..000000000
--- a/src/backend-core-0/README.md
+++ /dev/null
@@ -1,50 +0,0 @@
-# What is `backend-core-0`?
-
-The ugly name is intentional. We prefer to refactor incrementally which
-means we need a way to "re-core" the backend, and we may do this more
-than once simultaneously (hence it's `0` right now).
-
-"re-core" is a term I just made up, and it means this:
-> To find the utility code that is not dependent on other utility code,
-> move that into a new package, and then continue this process in multiple
-> iterations until the problem being solved is solved.
-
-The purpose of `backend-core-0` is to move common dependencies for driver
-implementations into a new core so that existing driver implementations
-can be moved from backend modules (part of the `backend` package) to
-extensions (packages added to Puter at runtime).
-
-What will follow is a log of what was moved here and why.
-
-## 2025-03-31
-
-The AI/LLM driver module depends on constructs related to driver
-interfaces. The actual mechanism that facilitates these interfaces,
-as well as the interface format, both don't really have a name yet;
-I'll call it the "PDIM" (Puter Driver Interface Mechanism) in this log.
-
-The PDIM depends on some class definitions currently in
-`src/backend/src/services/drivers/meta` which are split into the categories
-of "Constructs" and "Runtime Entities". A construct is the class
-representation of something defined in an interface, including
-**Interface** itself, and a RuntimeEntity - well there's only one;
-it's a wrapper for runtime-typed values such as "jpeg stream".
-
-A construct called **Parameter**, which is the class represerntation
-of a parameter of an interface that a driver may implement, depends on
-a file called `types.js`. This file defines high-level types like String,
-URL, File, etc that can be used in Puter drivers.
-
-Some types depend on utilities in Puter's backend:
-- **File**
-  - filesystem/validation
-  - `is_valid_uuidv4` from helpers.js
-- **URL**
-  - `is_valid_url` from helpers.js
-
-These utilities do not have dependencies so they are good candidates
-to be moved into this package. Afterwards, it currently apperas that
-everything in `drivers/meta` can be moved here, allowing DriverService
-to finally be moved to a backend module (right now it's part of backend
-core), and driver modules like `puterai` will be closer to being able
-to be moved to extensions.
diff --git a/src/backend-core-0/package.json b/src/backend-core-0/package.json
deleted file mode 100644
index c17810527..000000000
--- a/src/backend-core-0/package.json
+++ /dev/null
@@ -1,24 +0,0 @@
-{
-  "name": "@heyputer/backend-core-0",
-  "version": "1.0.0",
-  "description": "The ugly name is intentional. We prefer to refactor incrementally which means we need a way to \"re-core\" the backend, and we may do this more than once simultaneously (hence it's `0` right now).",
-  "type": "module",
-  "scripts": {
-    "build": "webpack",
-    "prepare": "npm run build",
-    "test": "echo \"Error: no test specified\" && exit 1"
-  },
-  "exports": {
-    ".": {
-      "require": "./dist/cjs/exports.cjs",
-      "import": "./dist/esm/exports.js"
-    }
-  },
-  "devDependencies": {
-    "webpack": "^5.88.2",
-    "webpack-cli": "^5.1.1"
-  },
-  "keywords": [],
-  "author": "",
-  "license": "AGPL-3.0-only"
-}
\ No newline at end of file
diff --git a/src/backend-core-0/src/exports.js b/src/backend-core-0/src/exports.js
deleted file mode 100644
index 86e2b4911..000000000
--- a/src/backend-core-0/src/exports.js
+++ /dev/null
@@ -1 +0,0 @@
-export * as validation from './pdim/validation.js';
diff --git a/src/backend-core-0/src/pdim/validation.js b/src/backend-core-0/src/pdim/validation.js
deleted file mode 100644
index d01349495..000000000
--- a/src/backend-core-0/src/pdim/validation.js
+++ /dev/null
@@ -1,75 +0,0 @@
-export const is_valid_uuid = ( uuid ) => {
-    let s = `${ uuid}`;
-    s = s.match(/^[0-9a-f]{8}-[0-9a-f]{4}-[0-5][0-9a-f]{3}-[089ab][0-9a-f]{3}-[0-9a-f]{12}$/i);
-    return !!s;
-};
-
-export const is_valid_uuid4 = ( uuid ) => {
-    return is_valid_uuid(uuid);
-};
-
-export const is_specifically_uuidv4 = ( uuid ) => {
-    let s = `${ uuid}`;
-
-    s = s.match(/^[0-9A-F]{8}-[0-9A-F]{4}-[4][0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i);
-    if ( ! s ) {
-        return false;
-    }
-    return true;
-};
-
-export const is_valid_url = ( url ) => {
-    let s = `${ url}`;
-
-    try {
-        new URL(s);
-        return true;
-    } catch (e) {
-        return false;
-    }
-};
-
-const path_excludes = () => /[\x00-\x1F]/g;
-
-// this characters are not allowed in path names because
-// they might be used to trick the user into thinking
-// a filename is different from what it actually is.
-const safety_excludes = [
-    /[\u202A-\u202E]/, // RTL and LTR override
-    /[\u200E-\u200F]/, // RTL and LTR mark
-    /[\u2066-\u2069]/, // RTL and LTR isolate
-    /[\u2028-\u2029]/, // line and paragraph separator
-    /[\uFF01-\uFF5E]/, // fullwidth ASCII
-    /[\u2060]/, // word joiner
-    /[\uFEFF]/, // zero width no-break space
-    /[\uFFFE-\uFFFF]/, // non-characters
-];
-
-export const is_valid_path = (path, {
-    no_relative_components,
-    allow_path_fragment,
-} = {}) => {
-    if ( typeof path !== 'string' ) return false;
-    if ( path.length < 1 ) false;
-    if ( path_excludes().test(path) ) return false;
-    for ( const exclude of safety_excludes ) {
-        if ( exclude.test(path) ) return false;
-    }
-
-    if ( ! allow_path_fragment ) {
-        if ( path[0] !== '/' && path[0] !== '.' ) {
-            return false;
-        }
-    }
-
-    if ( no_relative_components ) {
-        const components = path.split('/');
-        for ( const component of components ) {
-            if ( component === '' ) continue;
-            const name_without_dots = component.replace(/\./g, '');
-            if ( name_without_dots.length < 1 ) return false;
-        }
-    }
-
-    return true;
-};
diff --git a/src/backend-core-0/webpack.config.js b/src/backend-core-0/webpack.config.js
deleted file mode 100644
index 87489833b..000000000
--- a/src/backend-core-0/webpack.config.js
+++ /dev/null
@@ -1,53 +0,0 @@
-import path from 'node:path';
-import { fileURLToPath } from 'node:url';
-
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = path.dirname(__filename);
-
-// ESM build
-const esmConfig = {
-    mode: 'production',
-    entry: './src/exports.js',
-    experiments: {
-        outputModule: true,
-    },
-    output: {
-        path: path.resolve(__dirname, 'dist/esm'),
-        filename: 'exports.js',
-        module: true,
-        library: {
-            type: 'module',
-        },
-    },
-    optimization: {
-        minimize: false,
-    },
-    resolve: {
-        extensions: ['.js', '.mjs'],
-        fullySpecified: false,
-    },
-    target: 'node',
-};
-
-// CJS build
-const cjsConfig = {
-    mode: 'production',
-    entry: './src/exports.js',
-    output: {
-        path: path.resolve(__dirname, 'dist/cjs'),
-        filename: 'exports.cjs',
-        library: {
-            type: 'commonjs2',
-        },
-    },
-    optimization: {
-        minimize: false,
-    },
-    resolve: {
-        extensions: ['.js', '.mjs'],
-        fullySpecified: false,
-    },
-    target: 'node',
-};
-
-export default [esmConfig, cjsConfig];
diff --git a/src/backend/src/CoreModule.js b/src/backend/src/CoreModule.js
index ca8585099..666a6f694 100644
--- a/src/backend/src/CoreModule.js
+++ b/src/backend/src/CoreModule.js
@@ -74,7 +74,7 @@ const install = async ({ context, services, app, useapi, modapi }) => {
         def('core.fs.selectors', require('./filesystem/node/selectors'));
         def('core.util.stream', require('./util/streamutil'));
         def('web', require('./util/expressutil'));
-        def('core.validation', require('@heyputer/backend-core-0').validation);
+        def('core.validation', require('./validation'));
 
         def('core.database', require('./services/database/consts.js'));
 
@@ -453,4 +453,4 @@ class CoreModule extends AdvancedBase {
     }
 }
 
-module.exports = CoreModule;
\ No newline at end of file
+module.exports = CoreModule;
diff --git a/src/backend/src/helpers.js b/src/backend/src/helpers.js
index e72f70754..7580f9716 100644
--- a/src/backend/src/helpers.js
+++ b/src/backend/src/helpers.js
@@ -1713,7 +1713,7 @@ module.exports = {
     is_empty,
     is_shared_with,
     is_shared_with_anyone,
-    ...require('@heyputer/backend-core-0').validation,
+    ...require('./validation'),
     is_temp_users_disabled,
     is_user_signup_disabled,
     jwt_auth,
diff --git a/src/backend/src/validation.js b/src/backend/src/validation.js
new file mode 100644
index 000000000..4fef67aed
--- /dev/null
+++ b/src/backend/src/validation.js
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2024-present Puter Technologies Inc.
+ *
+ * This file is part of Puter.
+ *
+ * Puter is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+// Shared validation helpers formerly provided by backend-core-0.
+const { is_valid_path } = require('./filesystem/validation');
+
+const is_valid_uuid = (uuid) => {
+    let s = `${ uuid }`;
+    s = s.match(/^[0-9a-f]{8}-[0-9a-f]{4}-[0-5][0-9a-f]{3}-[089ab][0-9a-f]{3}-[0-9a-f]{12}$/i);
+    return !!s;
+};
+
+const is_valid_uuid4 = (uuid) => {
+    return is_valid_uuid(uuid);
+};
+
+const is_specifically_uuidv4 = (uuid) => {
+    let s = `${ uuid }`;
+
+    s = s.match(/^[0-9A-F]{8}-[0-9A-F]{4}-[4][0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i);
+    if ( ! s ) {
+        return false;
+    }
+    return true;
+};
+
+const is_valid_url = (url) => {
+    let s = `${ url }`;
+
+    try {
+        new URL(s);
+        return true;
+    } catch (e) {
+        return false;
+    }
+};
+
+module.exports = {
+    is_valid_uuid,
+    is_valid_uuid4,
+    is_specifically_uuidv4,
+    is_valid_url,
+    is_valid_path,
+};