Release Fixture Tools 0.1.0

.gitignore

@@ -0,0 +1,9 @@
+node_modules/
+dist/
+release/*.zip
+release/*.zip.sha256
+coverage/
+playwright-report/
+test-results/
+*.tsbuildinfo
+.DS_Store

.npmrc

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+@add-ideas:registry=https://git.add-ideas.de/api/packages/lotobo/npm/

CHANGELOG.md

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+# Changelog
+
+## 0.1.0 - 2026-09-01
+
+- Add bounded JSON Schema, SQL DDL, XSD, CSV-heading, and fixture-recipe import
+- Add normalized field modelling and deterministic seeded fixture generation
+- Add uniqueness, foreign keys, distributions, boundary cases, and an explicit
+  intentional-invalid-value ledger
+- Add JSON, CSV, NDJSON, XML, SQL, and recipe exports
+- Add local-first Toolbox shell integration, PWA metadata, documentation, and
+  Chromium/Firefox browser coverage

CONTRIBUTING.md

@@ -0,0 +1,3 @@
+# Contributing
+
+Run `npm ci`, `npm run check`, and `npm run test:browser` before proposing a change. Keep processing local, preserve explicit limits, and include fixtures for every parser boundary.

LICENSE

@@ -0,0 +1,674 @@
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+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

LICENSES/README.md

@@ -0,0 +1,3 @@
+# Licences
+
+The application is GPL-3.0-or-later. Generated release artifacts include an exact runtime dependency licence inventory in `npm-runtime-licenses.txt`.

README.md

@@ -0,0 +1,51 @@
+# Fixture Tools
+
+Generate deterministic, privacy-safe synthetic test fixtures entirely in the
+browser. Fixture Tools is a local-first module in the add·ideas Toolbox.
+
+## v0.1.0 capabilities
+
+- Import a focused subset of JSON Schema, SQL `CREATE TABLE` DDL, XSD, CSV
+  headings, or the app's portable fixture-model JSON
+- Review and edit normalized tables, fields, types, required/unique rules,
+  numeric and length ranges, enumerations, and foreign-key relationships
+- Generate reproducible rows from a text seed with uniform, sequential,
+  normal, and constant distributions
+- Deliberately exercise boundary values or inject invalid values, with a
+  separate violation ledger so negative-test fixtures cannot be mistaken for
+  valid data
+- Preserve referential integrity and field uniqueness for valid generated rows
+- Export JSON, spreadsheet-safe CSV, NDJSON, XML, SQL `INSERT` statements, or a
+  reusable fixture recipe
+- Use only reserved example domains for generated email addresses
+
+## Honest scope
+
+The importers normalize common declarative constructs; they are not complete
+JSON Schema, SQL, or XML Schema validators. Remote references, schema code,
+database connections, XML entities, XSD `choice`/identity constraints, SQL
+dialects beyond common table/column clauses, and production-scale data loads are
+out of scope in v0.1.0.
+
+Inputs are capped at 2 MiB. A recipe can contain at most 20 tables and 100
+fields per table; generation is capped at 50,000 total rows and 8 MiB per
+serialized output, with no more than 100,000 generated field values. Synthetic
+data is not anonymization and must not be assumed
+to represent real populations. The seeded generator is reproducible, not
+cryptographically random.
+
+## Development
+
+```sh
+npm ci
+npm run check
+npm run test:browser
+```
+
+`npm run release:artifact` creates a deterministic release ZIP and SHA-256
+sidecar after all checks pass.
+
+## License
+
+GPL-3.0-or-later. See [LICENSE](LICENSE). Dependency notices are recorded in
+[THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).

SECURITY.md

@@ -0,0 +1,3 @@
+# Security
+
+Please report vulnerabilities privately to the repository owner. Do not attach sensitive source files to public issues. Imported inputs are untrusted; parsers must remain bounded and must not execute active content or fetch external resources.

SOURCE.md

@@ -0,0 +1,7 @@
+# Corresponding source
+
+The corresponding source for Fixture Tools 0.1.0 is available at:
+
+https://git.add-ideas.de/lotobo/fixture-tools/src/tag/v0.1.0
+
+Build with Node.js 22, npm 11, `npm ci`, and `npm run release:artifact`.

THIRD_PARTY_NOTICES.md

@@ -0,0 +1,13 @@
+# Third-party notices
+
+Fixture Tools 0.1.0 directly depends on these runtime packages:
+
+| Package                          | Pinned version | Declared licence |
+| -------------------------------- | -------------: | ---------------- |
+| `@add-ideas/toolbox-contract`    |          0.2.3 | Apache-2.0       |
+| `@add-ideas/toolbox-helpers`     |          0.1.0 | GPL-3.0-or-later |
+| `@add-ideas/toolbox-shell-react` |          0.2.3 | Apache-2.0       |
+| `react`                          |         19.2.8 | MIT              |
+| `react-dom`                      |         19.2.8 | MIT              |
+
+This table covers direct production dependencies, not transitive packages or development tooling. During a release build, the exact non-development dependency tree and discovered licence texts are generated from the lockfile into `LICENSES/npm-runtime-licenses.txt` and included in the release ZIP. Copyright and licence terms remain with their respective authors.

docs/ACCESSIBILITY.md

@@ -0,0 +1,10 @@
+# Accessibility
+
+Fixture Tools uses labelled native inputs, selects, buttons, tables, and tabs.
+Every operation is keyboard reachable, focus indicators remain visible, and
+light, dark, and system themes inherit the shared Toolbox shell behaviour.
+
+Status, errors, and intentional violations are expressed in text rather than by
+colour alone. Wide model and data tables scroll inside their own regions, and
+responsive layouts stack controls without changing their reading order. Reduced
+motion preferences disable decorative transitions.

docs/ARCHITECTURE.md

@@ -0,0 +1,20 @@
+# Architecture
+
+Fixture Tools is a relocatable React application with a framework-independent
+TypeScript core. Bounded import adapters turn JSON Schema, SQL DDL, XSD, CSV
+headings, and saved recipes into one normalized model. The editor works only on
+that inert model: imported SQL is never executed, XML entities are rejected,
+and no reference is fetched.
+
+Generation starts from a stable text-seeded pseudo-random stream. It creates
+ordinary fields first, applies requested non-reference invalid cases, resolves
+foreign keys against already generated target rows, and finally applies any
+requested foreign-key violations. Uniqueness bookkeeping and a separate
+violation ledger make the valid and negative-test paths explicit. Serializers
+operate over the resulting bounded dataset and enforce an 8 MiB output cap.
+
+The app deliberately uses a focused schema subset instead of claiming full
+standards conformance. Limits are 2 MiB per source, 20 tables, 100 fields per
+table, 10,000 rows per table, and 50,000 rows overall. These bounds keep parsing,
+editing, rendering, and download generation responsive in a browser tab. A
+second 100,000-value ceiling prevents wide models from defeating the row limit.

docs/PRIVACY-SECURITY.md

@@ -0,0 +1,18 @@
+# Privacy and security
+
+Files are read only after direct selection and remain in browser memory. There
+is no telemetry, analytics, account, upload, remote reference resolution,
+external font, or service dependency. The production content policy restricts
+connections to the same origin, and browser tests reject unexpected requests.
+
+Imported JSON, SQL, XML, and CSV are treated as data. SQL is never executed;
+XML document types and entity declarations are rejected. React renders values
+as text. CSV exports prefix formula-like cells to reduce spreadsheet injection,
+and SQL identifiers/literals are quoted by the serializer. These mitigations do
+not replace review before feeding intentionally invalid fixtures to another
+system.
+
+Generated values are synthetic and use reserved example domains. They are not
+anonymized real data, security tokens, cryptographic randomness, compliance
+evidence, or a statistical population model. A seed intentionally reproduces
+the same output and should not be treated as secret material.

eslint.config.mjs

@@ -0,0 +1,37 @@
+import js from "@eslint/js";
+import globals from "globals";
+import reactHooks from "eslint-plugin-react-hooks";
+import reactRefresh from "eslint-plugin-react-refresh";
+import tseslint from "typescript-eslint";
+
+export default tseslint.config(
+  {
+    ignores: [
+      "dist",
+      "release",
+      "coverage",
+      "test-results",
+      "playwright-report",
+    ],
+  },
+  {
+    extends: [js.configs.recommended, ...tseslint.configs.recommended],
+    files: ["**/*.{ts,tsx}"],
+    languageOptions: {
+      ecmaVersion: 2023,
+      globals: { ...globals.browser, ...globals.worker },
+    },
+    plugins: { "react-hooks": reactHooks, "react-refresh": reactRefresh },
+    rules: {
+      ...reactHooks.configs.recommended.rules,
+      "react-refresh/only-export-components": [
+        "warn",
+        { allowConstantExport: true },
+      ],
+    },
+  },
+  {
+    files: ["scripts/**/*.mjs", "playwright.config.ts"],
+    languageOptions: { globals: globals.node },
+  },
+);

index.html

@@ -0,0 +1,19 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta
+      name="description"
+      content="Generate deterministic synthetic test fixtures locally in the browser."
+    />
+    <link rel="icon" type="image/svg+xml" href="./favicon.svg" />
+    <link rel="manifest" href="./manifest.webmanifest" />
+    <meta name="theme-color" content="#29255f" />
+    <title>Fixture Tools</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="./src/main.tsx"></script>
+  </body>
+</html>

package.json

@@ -0,0 +1,71 @@
+{
+  "name": "fixture-tools",
+  "version": "0.1.0",
+  "description": "Generate deterministic, privacy-safe synthetic test fixtures locally in the browser.",
+  "license": "GPL-3.0-or-later",
+  "author": "Albrecht Degering",
+  "repository": {
+    "type": "git",
+    "url": "git+https://git.add-ideas.de/lotobo/fixture-tools.git"
+  },
+  "homepage": "https://git.add-ideas.de/lotobo/fixture-tools",
+  "bugs": {
+    "url": "https://git.add-ideas.de/lotobo/fixture-tools/issues"
+  },
+  "private": true,
+  "type": "module",
+  "engines": {
+    "node": ">=22"
+  },
+  "scripts": {
+    "predev": "npm run manifest:generate",
+    "dev": "vite",
+    "prebuild": "npm run release:prepare && npm run manifest:generate",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview",
+    "typecheck": "tsc -b --pretty false",
+    "lint": "eslint . --max-warnings=0",
+    "format": "prettier --write .",
+    "format:check": "prettier --check .",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "test:browser": "playwright test",
+    "manifest:generate": "node scripts/generate-toolbox-manifest.mjs",
+    "manifest:check": "node scripts/generate-toolbox-manifest.mjs --check",
+    "release:prepare": "node scripts/prepare-release-files.mjs",
+    "toolbox:check": "toolbox-check dist",
+    "package:release": "node scripts/package-release.mjs",
+    "check": "npm run manifest:check && npm run typecheck && npm run lint && npm run format:check && npm run test && npm run build && npm run toolbox:check",
+    "release:artifact": "npm run check && npm run test:browser && npm run package:release -- --force"
+  },
+  "dependencies": {
+    "@add-ideas/toolbox-contract": "0.2.3",
+    "@add-ideas/toolbox-helpers": "0.1.0",
+    "@add-ideas/toolbox-shell-react": "0.2.3",
+    "react": "19.2.8",
+    "react-dom": "19.2.8"
+  },
+  "devDependencies": {
+    "@add-ideas/toolbox-testkit": "0.2.3",
+    "@eslint/js": "10.0.1",
+    "@playwright/test": "1.62.1",
+    "@testing-library/jest-dom": "6.9.1",
+    "@testing-library/react": "16.3.2",
+    "@testing-library/user-event": "14.6.1",
+    "@types/node": "25.9.5",
+    "@types/react": "19.2.17",
+    "@types/react-dom": "19.2.5",
+    "@vitejs/plugin-react": "6.0.3",
+    "eslint": "10.7.0",
+    "eslint-plugin-react-hooks": "7.1.1",
+    "eslint-plugin-react-refresh": "0.5.2",
+    "globals": "17.7.0",
+    "jsdom": "29.1.1",
+    "prettier": "3.9.5",
+    "typescript": "6.0.3",
+    "typescript-eslint": "8.64.0",
+    "vite": "8.2.2",
+    "vitest": "4.1.11"
+  },
+  "packageManager": "npm@11.17.0"
+}

playwright.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig, devices } from "@playwright/test";
+
+export default defineConfig({
+  testDir: "./tests/browser",
+  fullyParallel: false,
+  workers: 1,
+  timeout: 120_000,
+  expect: { timeout: 10_000 },
+  reporter: [["list"]],
+  use: { baseURL: "http://127.0.0.1:4194", trace: "retain-on-failure" },
+  webServer: {
+    command: "npm run build && node scripts/serve-test.mjs",
+    url: "http://127.0.0.1:4194",
+    reuseExistingServer: !process.env.CI,
+    timeout: 180_000,
+  },
+  projects: [
+    { name: "chromium", use: { ...devices["Desktop Chrome"] } },
+    { name: "firefox", use: { ...devices["Desktop Firefox"] } },
+  ],
+});

public/CHANGELOG.md

@@ -0,0 +1,11 @@
+# Changelog
+
+## 0.1.0 - 2026-09-01
+
+- Add bounded JSON Schema, SQL DDL, XSD, CSV-heading, and fixture-recipe import
+- Add normalized field modelling and deterministic seeded fixture generation
+- Add uniqueness, foreign keys, distributions, boundary cases, and an explicit
+  intentional-invalid-value ledger
+- Add JSON, CSV, NDJSON, XML, SQL, and recipe exports
+- Add local-first Toolbox shell integration, PWA metadata, documentation, and
+  Chromium/Firefox browser coverage

public/CONTRIBUTING.md

@@ -0,0 +1,3 @@
+# Contributing
+
+Run `npm ci`, `npm run check`, and `npm run test:browser` before proposing a change. Keep processing local, preserve explicit limits, and include fixtures for every parser boundary.

public/LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+
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+software and other kinds of works.
+
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+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
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public/LICENSES/README.md

@@ -0,0 +1,3 @@
+# Licences
+
+The application is GPL-3.0-or-later. Generated release artifacts include an exact runtime dependency licence inventory in `npm-runtime-licenses.txt`.

public/README.md

@@ -0,0 +1,51 @@
+# Fixture Tools
+
+Generate deterministic, privacy-safe synthetic test fixtures entirely in the
+browser. Fixture Tools is a local-first module in the add·ideas Toolbox.
+
+## v0.1.0 capabilities
+
+- Import a focused subset of JSON Schema, SQL `CREATE TABLE` DDL, XSD, CSV
+  headings, or the app's portable fixture-model JSON
+- Review and edit normalized tables, fields, types, required/unique rules,
+  numeric and length ranges, enumerations, and foreign-key relationships
+- Generate reproducible rows from a text seed with uniform, sequential,
+  normal, and constant distributions
+- Deliberately exercise boundary values or inject invalid values, with a
+  separate violation ledger so negative-test fixtures cannot be mistaken for
+  valid data
+- Preserve referential integrity and field uniqueness for valid generated rows
+- Export JSON, spreadsheet-safe CSV, NDJSON, XML, SQL `INSERT` statements, or a
+  reusable fixture recipe
+- Use only reserved example domains for generated email addresses
+
+## Honest scope
+
+The importers normalize common declarative constructs; they are not complete
+JSON Schema, SQL, or XML Schema validators. Remote references, schema code,
+database connections, XML entities, XSD `choice`/identity constraints, SQL
+dialects beyond common table/column clauses, and production-scale data loads are
+out of scope in v0.1.0.
+
+Inputs are capped at 2 MiB. A recipe can contain at most 20 tables and 100
+fields per table; generation is capped at 50,000 total rows and 8 MiB per
+serialized output, with no more than 100,000 generated field values. Synthetic
+data is not anonymization and must not be assumed
+to represent real populations. The seeded generator is reproducible, not
+cryptographically random.
+
+## Development
+
+```sh
+npm ci
+npm run check
+npm run test:browser
+```
+
+`npm run release:artifact` creates a deterministic release ZIP and SHA-256
+sidecar after all checks pass.
+
+## License
+
+GPL-3.0-or-later. See [LICENSE](LICENSE). Dependency notices are recorded in
+[THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).

public/SECURITY.md

@@ -0,0 +1,3 @@
+# Security
+
+Please report vulnerabilities privately to the repository owner. Do not attach sensitive source files to public issues. Imported inputs are untrusted; parsers must remain bounded and must not execute active content or fetch external resources.

public/SOURCE.md

@@ -0,0 +1,7 @@
+# Corresponding source
+
+The corresponding source for Fixture Tools 0.1.0 is available at:
+
+https://git.add-ideas.de/lotobo/fixture-tools/src/tag/v0.1.0
+
+Build with Node.js 22, npm 11, `npm ci`, and `npm run release:artifact`.

public/THIRD_PARTY_NOTICES.md

@@ -0,0 +1,13 @@
+# Third-party notices
+
+Fixture Tools 0.1.0 directly depends on these runtime packages:
+
+| Package                          | Pinned version | Declared licence |
+| -------------------------------- | -------------: | ---------------- |
+| `@add-ideas/toolbox-contract`    |          0.2.3 | Apache-2.0       |
+| `@add-ideas/toolbox-helpers`     |          0.1.0 | GPL-3.0-or-later |
+| `@add-ideas/toolbox-shell-react` |          0.2.3 | Apache-2.0       |
+| `react`                          |         19.2.8 | MIT              |
+| `react-dom`                      |         19.2.8 | MIT              |
+
+This table covers direct production dependencies, not transitive packages or development tooling. During a release build, the exact non-development dependency tree and discovered licence texts are generated from the lockfile into `LICENSES/npm-runtime-licenses.txt` and included in the release ZIP. Copyright and licence terms remain with their respective authors.

public/docs/ACCESSIBILITY.md

@@ -0,0 +1,10 @@
+# Accessibility
+
+Fixture Tools uses labelled native inputs, selects, buttons, tables, and tabs.
+Every operation is keyboard reachable, focus indicators remain visible, and
+light, dark, and system themes inherit the shared Toolbox shell behaviour.
+
+Status, errors, and intentional violations are expressed in text rather than by
+colour alone. Wide model and data tables scroll inside their own regions, and
+responsive layouts stack controls without changing their reading order. Reduced
+motion preferences disable decorative transitions.

public/docs/ARCHITECTURE.md

@@ -0,0 +1,20 @@
+# Architecture
+
+Fixture Tools is a relocatable React application with a framework-independent
+TypeScript core. Bounded import adapters turn JSON Schema, SQL DDL, XSD, CSV
+headings, and saved recipes into one normalized model. The editor works only on
+that inert model: imported SQL is never executed, XML entities are rejected,
+and no reference is fetched.
+
+Generation starts from a stable text-seeded pseudo-random stream. It creates
+ordinary fields first, applies requested non-reference invalid cases, resolves
+foreign keys against already generated target rows, and finally applies any
+requested foreign-key violations. Uniqueness bookkeeping and a separate
+violation ledger make the valid and negative-test paths explicit. Serializers
+operate over the resulting bounded dataset and enforce an 8 MiB output cap.
+
+The app deliberately uses a focused schema subset instead of claiming full
+standards conformance. Limits are 2 MiB per source, 20 tables, 100 fields per
+table, 10,000 rows per table, and 50,000 rows overall. These bounds keep parsing,
+editing, rendering, and download generation responsive in a browser tab. A
+second 100,000-value ceiling prevents wide models from defeating the row limit.

public/docs/PRIVACY-SECURITY.md

@@ -0,0 +1,18 @@
+# Privacy and security
+
+Files are read only after direct selection and remain in browser memory. There
+is no telemetry, analytics, account, upload, remote reference resolution,
+external font, or service dependency. The production content policy restricts
+connections to the same origin, and browser tests reject unexpected requests.
+
+Imported JSON, SQL, XML, and CSV are treated as data. SQL is never executed;
+XML document types and entity declarations are rejected. React renders values
+as text. CSV exports prefix formula-like cells to reduce spreadsheet injection,
+and SQL identifiers/literals are quoted by the serializer. These mitigations do
+not replace review before feeding intentionally invalid fixtures to another
+system.
+
+Generated values are synthetic and use reserved example domains. They are not
+anonymized real data, security tokens, cryptographic randomness, compliance
+evidence, or a statistical population model. A seed intentionally reproduces
+the same output and should not be treated as secret material.

public/favicon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" role="img" aria-label="Fixture Tools"><path fill="#5b4ec4" d="M11 4h30l12 12v44H11z"/><path fill="#fff" opacity=".28" d="M41 4v14h12"/><path fill="#fff" d="M17 27h8v8h-8zm11 0h8v8h-8zm11 0h8v8h-8zM17 38h8v8h-8zm11 0h8v8h-8zm11 0h8v8h-8z"/><circle cx="21" cy="31" r="2" fill="#5b4ec4"/><circle cx="43" cy="42" r="2" fill="#5b4ec4"/></svg>

public/manifest.webmanifest

@@ -0,0 +1,18 @@
+{
+  "name": "Fixture Tools",
+  "short_name": "Fixtures",
+  "description": "Generate deterministic synthetic test data locally.",
+  "start_url": "./",
+  "scope": "./",
+  "display": "standalone",
+  "background_color": "#f6f7fb",
+  "theme_color": "#29255f",
+  "icons": [
+    {
+      "src": "./favicon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml",
+      "purpose": "any maskable"
+    }
+  ]
+}

public/sw.js

@@ -0,0 +1,54 @@
+const CACHE_PREFIX = "fixture-tools-shell-";
+const CACHE_NAME = CACHE_PREFIX + "0.1.0";
+const CORE = ["./", "./manifest.webmanifest", "./favicon.svg"];
+self.addEventListener("install", (event) => {
+  event.waitUntil(
+    caches.open(CACHE_NAME).then(async (cache) => {
+      await cache.addAll(CORE);
+      const html = await (await fetch("./")).text();
+      const assets = [...html.matchAll(/(?:src|href)="(\.\/assets\/[^"]+)"/g)]
+        .map((match) => match[1])
+        .filter(Boolean);
+      await cache.addAll(assets);
+    }),
+  );
+  self.skipWaiting();
+});
+self.addEventListener("activate", (event) => {
+  event.waitUntil(
+    caches
+      .keys()
+      .then((keys) =>
+        Promise.all(
+          keys
+            .filter((key) => key.startsWith(CACHE_PREFIX) && key !== CACHE_NAME)
+            .map((key) => caches.delete(key)),
+        ),
+      )
+      .then(() => self.clients.claim()),
+  );
+});
+self.addEventListener("fetch", (event) => {
+  if (event.request.method !== "GET") return;
+  const url = new URL(event.request.url);
+  if (
+    url.origin !== self.location.origin ||
+    !url.pathname.startsWith(new URL(self.registration.scope).pathname)
+  )
+    return;
+  event.respondWith(
+    caches.match(event.request).then(
+      (cached) =>
+        cached ??
+        fetch(event.request).then((response) => {
+          if (response.ok) {
+            const copy = response.clone();
+            void caches
+              .open(CACHE_NAME)
+              .then((cache) => cache.put(event.request, copy));
+          }
+          return response;
+        }),
+    ),
+  );
+});

public/toolbox-app.json

@@ -0,0 +1,41 @@
+{
+  "$schema": "https://git.add-ideas.de/lotobo/toolbox-sdk/raw/branch/main/schemas/toolbox-app.v1.schema.json",
+  "schemaVersion": 1,
+  "id": "de.add-ideas.fixture-tools",
+  "name": "Fixture Tools",
+  "version": "0.1.0",
+  "description": "Generate deterministic synthetic test data locally.",
+  "entry": "./",
+  "icon": "./favicon.svg",
+  "categories": ["developer", "data", "productivity"],
+  "tags": ["fixtures", "synthetic-data", "schema", "csv", "sql", "testing"],
+  "integration": {
+    "contextVersion": 1,
+    "launchModes": ["navigate", "new-tab"],
+    "embedding": "unsupported"
+  },
+  "requirements": {
+    "secureContext": false,
+    "workers": false,
+    "indexedDb": false,
+    "crossOriginIsolated": false,
+    "topLevelContext": false
+  },
+  "privacy": {
+    "processing": "local",
+    "fileUploads": true,
+    "telemetry": false,
+    "label": "Inputs stay in this browser; nothing is uploaded."
+  },
+  "source": {
+    "repository": "https://git.add-ideas.de/lotobo/fixture-tools",
+    "license": "GPL-3.0-or-later"
+  },
+  "actions": [
+    {
+      "id": "source",
+      "label": "Source",
+      "url": "https://git.add-ideas.de/lotobo/fixture-tools"
+    }
+  ]
+}

scripts/generate-toolbox-manifest.mjs

@@ -0,0 +1,33 @@
+import { readFile, writeFile } from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { format } from "prettier";
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+const sourcePath = path.join(root, "src/toolbox/manifest.source.json");
+const outputPath = path.join(root, "public/toolbox-app.json");
+const source = JSON.parse(await readFile(sourcePath, "utf8"));
+const pkg = JSON.parse(await readFile(path.join(root, "package.json"), "utf8"));
+const versionSource = await readFile(path.join(root, "src/version.ts"), "utf8");
+const appVersion = /^export const APP_VERSION = "([^"]+)";$/mu.exec(
+  versionSource,
+)?.[1];
+const repository = "https://git.add-ideas.de/lotobo/" + pkg.name;
+if (source.version !== pkg.version || appVersion !== pkg.version)
+  throw new Error("Version identity drift");
+if (
+  source.id !== "de.add-ideas." + pkg.name ||
+  source.source?.repository !== repository ||
+  source.source?.license !== "GPL-3.0-or-later"
+)
+  throw new Error("Manifest source identity is invalid");
+const serialized = await format(JSON.stringify(source), {
+  filepath: outputPath,
+});
+if (process.argv.includes("--check")) {
+  if ((await readFile(outputPath, "utf8").catch(() => "")) !== serialized)
+    throw new Error("public/toolbox-app.json is stale");
+  console.log("Toolbox manifest is synchronized");
+} else {
+  await writeFile(outputPath, serialized);
+  console.log("Generated public/toolbox-app.json");
+}

scripts/package-release.mjs

@@ -0,0 +1,165 @@
+#!/usr/bin/env node
+import { createHash } from "node:crypto";
+import { execFile } from "node:child_process";
+import {
+  access,
+  chmod,
+  copyFile,
+  cp,
+  lstat,
+  mkdir,
+  mkdtemp,
+  readFile,
+  readdir,
+  rename,
+  rm,
+  utimes,
+  writeFile,
+} from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { promisify } from "node:util";
+import { fileURLToPath } from "node:url";
+const execute = promisify(execFile);
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+const pkg = JSON.parse(await readFile(path.join(root, "package.json"), "utf8"));
+const argument = (name, fallback) => {
+  const index = process.argv.indexOf(name);
+  return index >= 0 ? process.argv[index + 1] : fallback;
+};
+const output = path.resolve(
+  root,
+  argument("--output", "release/" + pkg.name + "-" + pkg.version + ".zip"),
+);
+const checksumOutput = output + ".sha256";
+const force = process.argv.includes("--force");
+if (
+  path.extname(output).toLowerCase() !== ".zip" ||
+  output === root ||
+  output === path.parse(output).root
+)
+  throw new Error("Unsafe release target");
+const exists = (file) =>
+  access(file).then(
+    () => true,
+    () => false,
+  );
+if (!force && ((await exists(output)) || (await exists(checksumOutput))))
+  throw new Error("Release output exists");
+const input = path.join(root, "dist");
+for (const name of [
+  "index.html",
+  "manifest.webmanifest",
+  "sw.js",
+  "toolbox-app.json",
+  "favicon.svg",
+  "README.md",
+  "CHANGELOG.md",
+  "CONTRIBUTING.md",
+  "LICENSE",
+  "SECURITY.md",
+  "SOURCE.md",
+  "THIRD_PARTY_NOTICES.md",
+  "LICENSES/README.md",
+  "LICENSES/npm-runtime-licenses.txt",
+  "docs/ACCESSIBILITY.md",
+  "docs/ARCHITECTURE.md",
+  "docs/PRIVACY-SECURITY.md",
+]) {
+  const details = await lstat(path.join(input, name)).catch(() => null);
+  if (!details?.isFile() || details.isSymbolicLink())
+    throw new Error("Missing release file: " + name);
+}
+const manifest = JSON.parse(
+  await readFile(path.join(input, "toolbox-app.json"), "utf8"),
+);
+const repository = "https://git.add-ideas.de/lotobo/" + pkg.name;
+if (
+  manifest.id !== "de.add-ideas." + pkg.name ||
+  manifest.version !== pkg.version ||
+  manifest.entry !== "./" ||
+  manifest.icon !== "./favicon.svg" ||
+  manifest.source?.repository !== repository
+)
+  throw new Error("Packaged manifest identity is invalid");
+if (
+  /\b(?:src|href)=["']\//iu.test(
+    await readFile(path.join(input, "index.html"), "utf8"),
+  )
+)
+  throw new Error("Root-absolute asset reference");
+async function collect(directory, prefix = "") {
+  const files = [];
+  for (const entry of (await readdir(directory, { withFileTypes: true })).sort(
+    (a, b) => a.name.localeCompare(b.name),
+  )) {
+    const absolute = path.join(directory, entry.name);
+    const relative = prefix ? prefix + "/" + entry.name : entry.name;
+    if (entry.isSymbolicLink())
+      throw new Error("Symlink in release: " + relative);
+    if (entry.isDirectory()) files.push(...(await collect(absolute, relative)));
+    else if (entry.isFile()) files.push({ absolute, relative });
+    else throw new Error("Unsupported release entry: " + relative);
+  }
+  return files;
+}
+const sourceFiles = await collect(input);
+for (const file of sourceFiles)
+  if (
+    file.relative.endsWith(".map") ||
+    /(?:^|\/)(?:\.env(?:\.|$)|id_rsa|id_ed25519|.*\.pem$|.*\.key$)/iu.test(
+      file.relative,
+    ) ||
+    file.relative.split("/").includes("..")
+  )
+    throw new Error("Forbidden release entry: " + file.relative);
+await mkdir(path.dirname(output), { recursive: true });
+const stagingRoot = await mkdtemp(
+  path.join(os.tmpdir(), pkg.name + "-release-"),
+);
+const publicationRoot = await mkdtemp(
+  path.join(path.dirname(output), "." + pkg.name + "-publish-"),
+);
+const stagedTree = path.join(stagingRoot, "tree");
+const stagedArchive = path.join(stagingRoot, path.basename(output));
+try {
+  await cp(input, stagedTree, { recursive: true });
+  const timestamp = new Date("1980-01-01T00:00:00.000Z");
+  for (const file of await collect(stagedTree)) {
+    await chmod(file.absolute, 0o644);
+    await utimes(file.absolute, timestamp, timestamp);
+  }
+  await execute(
+    "zip",
+    [
+      "-X",
+      "-q",
+      "-9",
+      stagedArchive,
+      ...sourceFiles.map((file) => file.relative),
+    ],
+    {
+      cwd: stagedTree,
+      env: { ...process.env, TZ: "UTC" },
+      maxBuffer: 1024 * 1024,
+    },
+  );
+  const archive = await readFile(stagedArchive);
+  const digest = createHash("sha256").update(archive).digest("hex");
+  const stagedChecksum = stagedArchive + ".sha256";
+  await writeFile(stagedChecksum, digest + "  " + path.basename(output) + "\n");
+  const publicationArchive = path.join(publicationRoot, path.basename(output));
+  const publicationChecksum = publicationArchive + ".sha256";
+  await copyFile(stagedArchive, publicationArchive);
+  await copyFile(stagedChecksum, publicationChecksum);
+  if (force) {
+    await rm(output, { force: true });
+    await rm(checksumOutput, { force: true });
+  }
+  await rename(publicationArchive, output);
+  await rename(publicationChecksum, checksumOutput);
+  console.log("Created " + path.relative(root, output) + "\nSHA-256 " + digest);
+} finally {
+  await rm(stagingRoot, { recursive: true, force: true });
+  await rm(publicationRoot, { recursive: true, force: true });
+}

scripts/prepare-release-files.mjs

@@ -0,0 +1,70 @@
+import { cp, mkdir, readFile, readdir, rm, writeFile } from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+const destination = path.join(root, "public");
+for (const name of [
+  "LICENSE",
+  "README.md",
+  "CHANGELOG.md",
+  "CONTRIBUTING.md",
+  "SECURITY.md",
+  "SOURCE.md",
+  "THIRD_PARTY_NOTICES.md",
+]) {
+  await readFile(path.join(root, name));
+  await cp(path.join(root, name), path.join(destination, name));
+}
+for (const directory of ["LICENSES", "docs"]) {
+  const output = path.join(destination, directory);
+  await rm(output, { recursive: true, force: true });
+  await cp(path.join(root, directory), output, { recursive: true });
+}
+const lock = JSON.parse(
+  await readFile(path.join(root, "package-lock.json"), "utf8"),
+);
+const sections = [];
+for (const [location, locked] of Object.entries(lock.packages ?? {}).sort(
+  ([a], [b]) => a.localeCompare(b),
+)) {
+  if (!location.includes("node_modules/") || locked.dev === true) continue;
+  const packageDirectory = path.join(root, location);
+  const details = JSON.parse(
+    await readFile(path.join(packageDirectory, "package.json"), "utf8"),
+  );
+  const candidates = (await readdir(packageDirectory))
+    .filter((name) => /^(?:licen[cs]e|copying|notice)(?:\.|$)/iu.test(name))
+    .sort();
+  const texts = [];
+  for (const candidate of candidates) {
+    try {
+      texts.push(
+        "--- " +
+          candidate +
+          " ---\n" +
+          (await readFile(path.join(packageDirectory, candidate), "utf8")),
+      );
+    } catch {
+      /* directory */
+    }
+  }
+  sections.push(
+    "=".repeat(78) +
+      "\n" +
+      details.name +
+      "@" +
+      details.version +
+      "\nDeclared licence: " +
+      (details.license ?? locked.license ?? "See upstream") +
+      "\n" +
+      "=".repeat(78) +
+      "\n" +
+      (texts.join("\n\n") || "See upstream package metadata."),
+  );
+}
+await mkdir(path.join(destination, "LICENSES"), { recursive: true });
+await writeFile(
+  path.join(destination, "LICENSES/npm-runtime-licenses.txt"),
+  sections.join("\n\n").trimEnd() + "\n",
+);
+console.log("Prepared release documentation");

scripts/serve-test.mjs

@@ -0,0 +1,66 @@
+import { createServer } from "node:http";
+import { readFile, stat } from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+const root = path.resolve(
+  path.dirname(fileURLToPath(import.meta.url)),
+  "..",
+  "dist",
+);
+const prefix = "/deep/nested/fixture/";
+const types = new Map([
+  [".css", "text/css; charset=utf-8"],
+  [".html", "text/html; charset=utf-8"],
+  [".js", "text/javascript; charset=utf-8"],
+  [".json", "application/json; charset=utf-8"],
+  [".webmanifest", "application/manifest+json; charset=utf-8"],
+  [".svg", "image/svg+xml"],
+  [".md", "text/markdown; charset=utf-8"],
+  [".txt", "text/plain; charset=utf-8"],
+  [".wasm", "application/wasm"],
+  [".png", "image/png"],
+  [".jpg", "image/jpeg"],
+  [".webp", "image/webp"],
+]);
+const headers = {
+  "Content-Security-Policy":
+    "default-src 'self'; base-uri 'self'; object-src 'none'; frame-ancestors 'none'; form-action 'self'; script-src 'self' 'wasm-unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; media-src 'self' blob:; connect-src 'self'; worker-src 'self' blob:; manifest-src 'self'",
+  "Cross-Origin-Opener-Policy": "same-origin",
+  "Cross-Origin-Resource-Policy": "same-origin",
+  "Permissions-Policy":
+    "camera=(), microphone=(), geolocation=(), usb=(), payment=()",
+  "Referrer-Policy": "no-referrer",
+  "X-Content-Type-Options": "nosniff",
+};
+const server = createServer(async (request, response) => {
+  try {
+    const url = new URL(request.url ?? "/", "http://127.0.0.1");
+    const relative = decodeURIComponent(url.pathname).startsWith(prefix)
+      ? decodeURIComponent(url.pathname).slice(prefix.length)
+      : decodeURIComponent(url.pathname).replace(/^\/+/, "");
+    const normalized = path.posix.normalize(relative || "index.html");
+    if (
+      normalized === ".." ||
+      normalized.startsWith("../") ||
+      path.isAbsolute(normalized)
+    ) {
+      response.writeHead(400).end("Bad request");
+      return;
+    }
+    let file = path.join(root, normalized);
+    if ((await stat(file).catch(() => null))?.isDirectory())
+      file = path.join(file, "index.html");
+    const content = await readFile(file);
+    response.writeHead(200, {
+      "Content-Type":
+        types.get(path.extname(file)) ?? "application/octet-stream",
+      "Cache-Control": "no-cache",
+      ...headers,
+    });
+    response.end(content);
+  } catch {
+    response.writeHead(404, { "Content-Type": "text/plain; charset=utf-8" });
+    response.end("Not found");
+  }
+});
+server.listen(4194, "127.0.0.1", () => console.log("Test server ready"));

src/App.tsx

@@ -0,0 +1,35 @@
+import { lazy, Suspense, useState } from "react";
+import { AppShell } from "@add-ideas/toolbox-shell-react";
+import "@add-ideas/toolbox-shell-react/styles.css";
+import "./styles.css";
+import { ErrorBoundary } from "./components/ErrorBoundary";
+import { HelpDialog } from "./components/HelpDialog";
+import { manifest } from "./toolbox/manifest";
+
+const Workbench = lazy(async () => ({
+  default: (await import("./components/Workbench")).Workbench,
+}));
+
+export function App() {
+  const [helpOpen, setHelpOpen] = useState(false);
+  return (
+    <ErrorBoundary>
+      <AppShell
+        app={manifest}
+        manifestUrl="./toolbox-app.json"
+        helpAction={{ onClick: () => setHelpOpen(true) }}
+      >
+        <Suspense
+          fallback={
+            <p className="loading" role="status">
+              Preparing Fixture Tools…
+            </p>
+          }
+        >
+          <Workbench />
+        </Suspense>
+      </AppShell>
+      <HelpDialog open={helpOpen} onClose={() => setHelpOpen(false)} />
+    </ErrorBoundary>
+  );
+}

src/components/ErrorBoundary.tsx

@@ -0,0 +1,27 @@
+import { Component, type ErrorInfo, type ReactNode } from "react";
+
+export class ErrorBoundary extends Component<
+  { children: ReactNode },
+  { error?: Error }
+> {
+  state: { error?: Error } = {};
+  static getDerivedStateFromError(error: Error) {
+    return { error };
+  }
+  componentDidCatch(error: Error, info: ErrorInfo) {
+    console.error("Application failure", error, info);
+  }
+  render() {
+    if (this.state.error)
+      return (
+        <main className="fatal">
+          <h1>Fixture Tools could not continue</h1>
+          <p>{this.state.error.message}</p>
+          <button type="button" onClick={() => location.reload()}>
+            Reload
+          </button>
+        </main>
+      );
+    return this.props.children;
+  }
+}

src/components/HelpDialog.tsx

@@ -0,0 +1,45 @@
+import { useEffect, useRef } from "react";
+
+export function HelpDialog({
+  open,
+  onClose,
+}: {
+  open: boolean;
+  onClose: () => void;
+}) {
+  const dialog = useRef<HTMLDialogElement>(null);
+  useEffect(() => {
+    const node = dialog.current;
+    if (!node) return;
+    if (open && !node.open) node.showModal();
+    if (!open && node.open) node.close();
+  }, [open]);
+  return (
+    <dialog
+      ref={dialog}
+      className="help-dialog"
+      onClose={onClose}
+      onCancel={onClose}
+      aria-labelledby="help-title"
+    >
+      <div className="dialog-heading">
+        <div>
+          <p className="eyebrow">Local-first help</p>
+          <h2 id="help-title">About Fixture Tools</h2>
+        </div>
+        <button type="button" onClick={onClose} aria-label="Close help">
+          ×
+        </button>
+      </div>
+      <p>
+        Import a focused JSON Schema, SQL DDL, XSD, CSV header, or saved fixture
+        recipe and generate repeatable synthetic datasets in the browser.
+      </p>
+      <p>
+        Inputs stay on this device. A seed reproduces the same rows, while
+        boundary and intentionally invalid values are explicitly labelled.
+        Generated fixtures are test data—not anonymized copies of real people.
+      </p>
+    </dialog>
+  );
+}

src/components/Workbench.tsx

@@ -0,0 +1,823 @@
+import { useMemo, useState, type ChangeEvent } from "react";
+import { triggerBlobDownload } from "@add-ideas/toolbox-helpers";
+import {
+  generateFixtures,
+  modelJson,
+  parseFixtureModel,
+  serializeDataset,
+  validateModel,
+  type Distribution,
+  type FixtureField,
+  type FixtureModel,
+  type FixtureType,
+  type GeneratedDataset,
+  type ModelFormat,
+  type OutputFormat,
+} from "../fixture/model";
+
+const SAMPLE_SQL = `CREATE TABLE users (
+  id INTEGER PRIMARY KEY,
+  email VARCHAR(80) NOT NULL UNIQUE,
+  display_name VARCHAR(48) NOT NULL,
+  active BOOLEAN NOT NULL,
+  created_at TIMESTAMP NOT NULL
+);
+
+CREATE TABLE orders (
+  id INTEGER PRIMARY KEY,
+  user_id INTEGER NOT NULL REFERENCES users(id),
+  amount DECIMAL(10,2) NOT NULL,
+  ordered_at TIMESTAMP NOT NULL
+);`;
+
+const initialParsed = parseFixtureModel(SAMPLE_SQL, "sql");
+const initialDataset = generateFixtures(initialParsed.model, {
+  seed: "fixture-tools-demo",
+  rows: 8,
+  boundaryPercent: 10,
+  invalidPercent: 0,
+});
+
+type View = "model" | "data" | "violations";
+const TYPES: FixtureType[] = [
+  "string",
+  "integer",
+  "number",
+  "boolean",
+  "date",
+  "datetime",
+  "email",
+  "uuid",
+  "enum",
+  "foreignKey",
+];
+const DISTRIBUTIONS: Distribution[] = [
+  "uniform",
+  "sequential",
+  "normal",
+  "constant",
+];
+
+function download(text: string, filename: string, mediaType: string) {
+  triggerBlobDownload(new Blob([text], { type: mediaType }), filename);
+}
+
+function replaceField(
+  model: FixtureModel,
+  tableIndex: number,
+  fieldIndex: number,
+  changes: Partial<FixtureField>,
+): FixtureModel {
+  return {
+    tables: model.tables.map((table, currentTable) =>
+      currentTable === tableIndex
+        ? {
+            ...table,
+            fields: table.fields.map((field, currentField) =>
+              currentField === fieldIndex ? { ...field, ...changes } : field,
+            ),
+          }
+        : table,
+    ),
+  };
+}
+
+function FieldEditor({
+  field,
+  onChange,
+  onRemove,
+}: {
+  field: FixtureField;
+  onChange: (changes: Partial<FixtureField>) => void;
+  onRemove: () => void;
+}) {
+  return (
+    <tr>
+      <td>
+        <input
+          aria-label={`${field.name} field name`}
+          value={field.name}
+          onChange={(event) => onChange({ name: event.target.value })}
+        />
+      </td>
+      <td>
+        <select
+          aria-label={`${field.name} type`}
+          value={field.type}
+          onChange={(event) => {
+            const type = event.target.value as FixtureType;
+            onChange({
+              type,
+              reference:
+                type === "foreignKey" ? (field.reference ?? "") : undefined,
+              values: type === "enum" ? (field.values ?? []) : undefined,
+              constant: undefined,
+              distribution:
+                type === "foreignKey" || field.distribution === "constant"
+                  ? "uniform"
+                  : field.distribution,
+            });
+          }}
+        >
+          {TYPES.map((type) => (
+            <option key={type}>{type}</option>
+          ))}
+        </select>
+      </td>
+      <td>
+        <select
+          aria-label={`${field.name} distribution`}
+          value={field.distribution}
+          disabled={field.type === "foreignKey"}
+          onChange={(event) => {
+            const distribution = event.target.value as Distribution;
+            onChange({
+              distribution,
+              ...(distribution === "constant" ? {} : { constant: undefined }),
+            });
+          }}
+        >
+          {DISTRIBUTIONS.map((distribution) => (
+            <option key={distribution}>{distribution}</option>
+          ))}
+        </select>
+      </td>
+      <td className="flag-cell">
+        <label>
+          <input
+            type="checkbox"
+            checked={field.required}
+            onChange={(event) => onChange({ required: event.target.checked })}
+          />
+          required
+        </label>
+        <label>
+          <input
+            type="checkbox"
+            checked={field.unique}
+            onChange={(event) => onChange({ unique: event.target.checked })}
+          />
+          unique
+        </label>
+      </td>
+      <td>
+        {field.type === "foreignKey" ? (
+          <input
+            aria-label={`${field.name} reference`}
+            placeholder="table.field"
+            value={field.reference ?? ""}
+            onChange={(event) => onChange({ reference: event.target.value })}
+          />
+        ) : field.type === "enum" ? (
+          <span className="range-inputs">
+            <input
+              aria-label={`${field.name} enum values`}
+              placeholder="draft, active, closed"
+              value={(field.values ?? []).join(", ")}
+              onChange={(event) =>
+                onChange({
+                  values: event.target.value
+                    .split(",")
+                    .map((value) => value.trim())
+                    .filter(Boolean),
+                })
+              }
+            />
+            {field.distribution === "constant" ? (
+              <select
+                aria-label={`${field.name} constant`}
+                value={(field.values ?? []).findIndex(
+                  (value) => value === field.constant,
+                )}
+                onChange={(event) =>
+                  onChange({
+                    constant:
+                      field.values?.[Number(event.target.value)] ?? undefined,
+                  })
+                }
+              >
+                <option value="-1">Choose constant</option>
+                {(field.values ?? []).map((value, index) => (
+                  <option value={index} key={`${String(value)}-${index}`}>
+                    {String(value)}
+                  </option>
+                ))}
+              </select>
+            ) : null}
+          </span>
+        ) : field.distribution === "constant" ? (
+          field.type === "boolean" ? (
+            <select
+              aria-label={`${field.name} constant`}
+              value={
+                typeof field.constant === "boolean"
+                  ? String(field.constant)
+                  : ""
+              }
+              onChange={(event) =>
+                onChange({
+                  constant:
+                    event.target.value === ""
+                      ? undefined
+                      : event.target.value === "true",
+                })
+              }
+            >
+              <option value="">Choose constant</option>
+              <option value="true">true</option>
+              <option value="false">false</option>
+            </select>
+          ) : (
+            <input
+              aria-label={`${field.name} constant`}
+              type={
+                field.type === "integer" || field.type === "number"
+                  ? "number"
+                  : field.type === "date"
+                    ? "date"
+                    : "text"
+              }
+              step={field.type === "integer" ? "1" : undefined}
+              placeholder="constant value"
+              value={field.constant == null ? "" : String(field.constant)}
+              onChange={(event) =>
+                onChange({
+                  constant:
+                    event.target.value === ""
+                      ? undefined
+                      : field.type === "integer" || field.type === "number"
+                        ? Number(event.target.value)
+                        : event.target.value,
+                })
+              }
+            />
+          )
+        ) : field.type === "integer" || field.type === "number" ? (
+          <span className="range-inputs">
+            <input
+              aria-label={`${field.name} minimum`}
+              type="number"
+              placeholder="min"
+              value={field.minimum ?? ""}
+              onChange={(event) =>
+                onChange({
+                  minimum: event.target.value
+                    ? Number(event.target.value)
+                    : undefined,
+                })
+              }
+            />
+            <input
+              aria-label={`${field.name} maximum`}
+              type="number"
+              placeholder="max"
+              value={field.maximum ?? ""}
+              onChange={(event) =>
+                onChange({
+                  maximum: event.target.value
+                    ? Number(event.target.value)
+                    : undefined,
+                })
+              }
+            />
+          </span>
+        ) : (
+          <span className="range-inputs">
+            <input
+              aria-label={`${field.name} minimum length`}
+              type="number"
+              min="0"
+              placeholder="min length"
+              value={field.minLength ?? ""}
+              onChange={(event) =>
+                onChange({
+                  minLength: event.target.value
+                    ? Number(event.target.value)
+                    : undefined,
+                })
+              }
+            />
+            <input
+              aria-label={`${field.name} maximum length`}
+              type="number"
+              min="0"
+              placeholder="max length"
+              value={field.maxLength ?? ""}
+              onChange={(event) =>
+                onChange({
+                  maxLength: event.target.value
+                    ? Number(event.target.value)
+                    : undefined,
+                })
+              }
+            />
+          </span>
+        )}
+      </td>
+      <td>
+        <button className="icon-button danger" type="button" onClick={onRemove}>
+          Remove
+        </button>
+      </td>
+    </tr>
+  );
+}
+
+export function Workbench() {
+  const [source, setSource] = useState(SAMPLE_SQL);
+  const [sourceName, setSourceName] = useState("shop.sql");
+  const [inputFormat, setInputFormat] = useState<ModelFormat>("sql");
+  const [model, setModel] = useState<FixtureModel>(initialParsed.model);
+  const [notices, setNotices] = useState(initialParsed.notices);
+  const [dataset, setDataset] = useState<GeneratedDataset>(initialDataset);
+  const [seed, setSeed] = useState("fixture-tools-demo");
+  const [rows, setRows] = useState(8);
+  const [boundaryPercent, setBoundaryPercent] = useState(10);
+  const [invalidPercent, setInvalidPercent] = useState(0);
+  const [selectedTable, setSelectedTable] = useState(model.tables[0]!.name);
+  const [outputFormat, setOutputFormat] = useState<OutputFormat>("json");
+  const [view, setView] = useState<View>("data");
+  const [error, setError] = useState<string>();
+
+  const tableIndex = Math.max(
+    0,
+    model.tables.findIndex((table) => table.name === selectedTable),
+  );
+  const table = model.tables[tableIndex]!;
+  const records = dataset.tables[selectedTable] ?? [];
+  const output = useMemo(() => {
+    try {
+      return { text: serializeDataset(dataset, outputFormat, selectedTable) };
+    } catch (reason) {
+      return {
+        text: "",
+        error: reason instanceof Error ? reason.message : "Output failed.",
+      };
+    }
+  }, [dataset, outputFormat, selectedTable]);
+
+  const parseSource = () => {
+    try {
+      const parsed = parseFixtureModel(source, inputFormat);
+      setModel(parsed.model);
+      setNotices(parsed.notices);
+      setSelectedTable(parsed.model.tables[0]!.name);
+      setError(undefined);
+      setView("model");
+    } catch (reason) {
+      setError(
+        reason instanceof Error
+          ? reason.message
+          : "The model could not be parsed.",
+      );
+    }
+  };
+
+  const generate = () => {
+    try {
+      const validated = validateModel(structuredClone(model));
+      const next = generateFixtures(validated, {
+        seed,
+        rows,
+        boundaryPercent,
+        invalidPercent,
+      });
+      setModel(validated);
+      setDataset(next);
+      setError(undefined);
+      setView("data");
+    } catch (reason) {
+      setError(reason instanceof Error ? reason.message : "Generation failed.");
+    }
+  };
+
+  const openFile = async (event: ChangeEvent<HTMLInputElement>) => {
+    const file = event.target.files?.[0];
+    event.target.value = "";
+    if (!file) return;
+    if (file.size > 2 * 1024 * 1024) {
+      setError("Model file exceeds 2 MiB.");
+      return;
+    }
+    const extension = file.name.split(".").at(-1)?.toLowerCase();
+    const format: ModelFormat = file.name
+      .toLowerCase()
+      .endsWith(".fixture.json")
+      ? "fixture-model"
+      : extension === "sql"
+        ? "sql"
+        : extension === "xsd"
+          ? "xsd"
+          : extension === "csv"
+            ? "csv"
+            : "json-schema";
+    setSource(await file.text());
+    setSourceName(file.name);
+    setInputFormat(format);
+    setError(undefined);
+  };
+
+  const updateCurrentField = (
+    fieldIndex: number,
+    changes: Partial<FixtureField>,
+  ) =>
+    setModel((current) =>
+      replaceField(current, tableIndex, fieldIndex, changes),
+    );
+
+  const extension =
+    outputFormat === "json"
+      ? "json"
+      : outputFormat === "ndjson"
+        ? "ndjson"
+        : outputFormat === "xml"
+          ? "xml"
+          : outputFormat === "sql"
+            ? "sql"
+            : "csv";
+
+  return (
+    <main className="workbench">
+      <section className="hero">
+        <div>
+          <p className="eyebrow">Deterministic synthetic-data laboratory</p>
+          <h1>Fixture Tools</h1>
+          <p>
+            Turn local schemas into replayable, privacy-safe datasets—with
+            foreign keys, boundary values and intentionally invalid cases kept
+            explicit.
+          </p>
+        </div>
+        <span className="privacy-pill">Seeded · local only</span>
+      </section>
+
+      <section className="panel source-panel" aria-labelledby="source-title">
+        <div className="panel-heading">
+          <div>
+            <h2 id="source-title">Model source</h2>
+            <p>
+              {sourceName} · the last valid model remains active after an error
+            </p>
+          </div>
+          <label className="button file-button">
+            Open model
+            <input
+              data-testid="model-file-input"
+              type="file"
+              accept=".json,.schema.json,.sql,.xsd,.csv,application/json,text/csv,text/xml"
+              onChange={(event) => void openFile(event)}
+            />
+          </label>
+        </div>
+        <div className="source-grid">
+          <label>
+            Source kind
+            <select
+              aria-label="Source kind"
+              value={inputFormat}
+              onChange={(event) =>
+                setInputFormat(event.target.value as ModelFormat)
+              }
+            >
+              <option value="fixture-model">Fixture model JSON</option>
+              <option value="json-schema">JSON Schema</option>
+              <option value="sql">SQL DDL</option>
+              <option value="xsd">XSD</option>
+              <option value="csv">CSV headings</option>
+            </select>
+          </label>
+          <button
+            className="primary-button"
+            type="button"
+            onClick={parseSource}
+          >
+            Import model
+          </button>
+        </div>
+        <textarea
+          aria-label="Fixture model source"
+          value={source}
+          onChange={(event) => setSource(event.target.value)}
+          rows={10}
+          spellCheck={false}
+        />
+        {error ? (
+          <p className="error" role="alert">
+            {error} Existing model and generated data were retained.
+          </p>
+        ) : (
+          <p className="success" role="status">
+            {model.tables.length} table{model.tables.length === 1 ? "" : "s"} ·{" "}
+            {model.tables.reduce((sum, item) => sum + item.fields.length, 0)}{" "}
+            fields · {dataset.violations.length} intentional violations
+          </p>
+        )}
+        {notices.slice(0, 8).map((notice) => (
+          <p className="warning" key={notice}>
+            {notice}
+          </p>
+        ))}
+      </section>
+
+      <section
+        className="panel generator-panel"
+        aria-labelledby="generator-title"
+      >
+        <div className="panel-heading">
+          <div>
+            <h2 id="generator-title">Generation recipe</h2>
+            <p>Same model, seed and settings produce the same records.</p>
+          </div>
+          <button
+            type="button"
+            onClick={() =>
+              download(
+                modelJson(model),
+                "fixture-model.json",
+                "application/json",
+              )
+            }
+          >
+            Export model
+          </button>
+        </div>
+        <div className="option-grid">
+          <label>
+            Seed
+            <input
+              value={seed}
+              maxLength={256}
+              onChange={(event) => setSeed(event.target.value)}
+            />
+          </label>
+          <label>
+            Rows per table
+            <input
+              type="number"
+              min="1"
+              max="10000"
+              value={rows}
+              onChange={(event) => setRows(Number(event.target.value))}
+            />
+          </label>
+          <label>
+            Boundary values (%)
+            <input
+              type="number"
+              min="0"
+              max="100"
+              value={boundaryPercent}
+              onChange={(event) =>
+                setBoundaryPercent(Number(event.target.value))
+              }
+            />
+          </label>
+          <label>
+            Intentional invalids (%)
+            <input
+              type="number"
+              min="0"
+              max="100"
+              value={invalidPercent}
+              onChange={(event) =>
+                setInvalidPercent(Number(event.target.value))
+              }
+            />
+          </label>
+          <button className="primary-button" type="button" onClick={generate}>
+            Generate fixtures
+          </button>
+        </div>
+      </section>
+
+      <nav className="tabs" aria-label="Fixture workspaces">
+        {(["model", "data", "violations"] as View[]).map((name) => (
+          <button
+            type="button"
+            key={name}
+            aria-pressed={view === name}
+            onClick={() => setView(name)}
+          >
+            {name === "violations"
+              ? `Invalid cases (${dataset.violations.length})`
+              : name[0]!.toUpperCase() + name.slice(1)}
+          </button>
+        ))}
+      </nav>
+
+      {view === "model" ? (
+        <section className="panel">
+          <div className="panel-heading">
+            <div>
+              <h2>Editable field model</h2>
+              <p>
+                Imported constructs are normalized into this inspectable model.
+              </p>
+            </div>
+            <label>
+              Table
+              <select
+                aria-label="Model table"
+                value={selectedTable}
+                onChange={(event) => setSelectedTable(event.target.value)}
+              >
+                {model.tables.map((item) => (
+                  <option key={item.name}>{item.name}</option>
+                ))}
+              </select>
+            </label>
+          </div>
+          <div className="table-scroll" tabIndex={0}>
+            <table className="field-table">
+              <thead>
+                <tr>
+                  <th>Name</th>
+                  <th>Type</th>
+                  <th>Distribution</th>
+                  <th>Rules</th>
+                  <th>Bounds / values / reference</th>
+                  <th>Action</th>
+                </tr>
+              </thead>
+              <tbody>
+                {table.fields.map((field, fieldIndex) => (
+                  <FieldEditor
+                    key={`${field.name}-${fieldIndex}`}
+                    field={field}
+                    onChange={(changes) =>
+                      updateCurrentField(fieldIndex, changes)
+                    }
+                    onRemove={() =>
+                      setModel((current) => ({
+                        tables: current.tables.map((item, currentIndex) =>
+                          currentIndex === tableIndex
+                            ? {
+                                ...item,
+                                fields: item.fields.filter(
+                                  (_field, index) => index !== fieldIndex,
+                                ),
+                              }
+                            : item,
+                        ),
+                      }))
+                    }
+                  />
+                ))}
+              </tbody>
+            </table>
+          </div>
+          <button
+            type="button"
+            className="top-gap"
+            onClick={() =>
+              setModel((current) => ({
+                tables: current.tables.map((item, currentIndex) =>
+                  currentIndex === tableIndex
+                    ? {
+                        ...item,
+                        fields: [
+                          ...item.fields,
+                          {
+                            name: `field_${item.fields.length + 1}`,
+                            type: "string",
+                            required: true,
+                            unique: false,
+                            distribution: "sequential",
+                          },
+                        ],
+                      }
+                    : item,
+                ),
+              }))
+            }
+          >
+            Add field
+          </button>
+        </section>
+      ) : null}
+
+      {view === "data" ? (
+        <section className="workspace-grid">
+          <article className="panel">
+            <div className="panel-heading">
+              <div>
+                <h2>Generated records</h2>
+                <p>
+                  Showing at most 100 of {records.length.toLocaleString()} rows.
+                </p>
+              </div>
+              <select
+                aria-label="Data table"
+                value={selectedTable}
+                onChange={(event) => setSelectedTable(event.target.value)}
+              >
+                {Object.keys(dataset.tables).map((name) => (
+                  <option key={name}>{name}</option>
+                ))}
+              </select>
+            </div>
+            <div className="table-scroll records" tabIndex={0}>
+              <table>
+                <thead>
+                  <tr>
+                    <th>#</th>
+                    {Object.keys(records[0] ?? {}).map((name) => (
+                      <th key={name}>{name}</th>
+                    ))}
+                  </tr>
+                </thead>
+                <tbody>
+                  {records.slice(0, 100).map((record, index) => (
+                    <tr key={index}>
+                      <th>{index + 1}</th>
+                      {Object.keys(record).map((name) => (
+                        <td key={name}>{String(record[name] ?? "null")}</td>
+                      ))}
+                    </tr>
+                  ))}
+                </tbody>
+              </table>
+            </div>
+          </article>
+          <article className="panel export-panel">
+            <div className="panel-heading">
+              <h2>Export</h2>
+              <label>
+                Format
+                <select
+                  aria-label="Output format"
+                  value={outputFormat}
+                  onChange={(event) =>
+                    setOutputFormat(event.target.value as OutputFormat)
+                  }
+                >
+                  <option value="json">JSON</option>
+                  <option value="csv">CSV (selected table)</option>
+                  <option value="ndjson">NDJSON</option>
+                  <option value="xml">XML</option>
+                  <option value="sql">SQL INSERT</option>
+                </select>
+              </label>
+            </div>
+            {output.error ? <p className="error">{output.error}</p> : null}
+            <textarea
+              aria-label="Generated output"
+              readOnly
+              rows={24}
+              value={output.text}
+            />
+            <button
+              className="primary-button top-gap"
+              type="button"
+              disabled={!output.text}
+              onClick={() =>
+                download(
+                  output.text,
+                  `fixtures.${extension}`,
+                  outputFormat === "json" || outputFormat === "ndjson"
+                    ? "application/json"
+                    : outputFormat === "xml"
+                      ? "application/xml"
+                      : "text/plain",
+                )
+              }
+            >
+              Download {extension.toUpperCase()}
+            </button>
+          </article>
+        </section>
+      ) : null}
+
+      {view === "violations" ? (
+        <section className="panel">
+          <div className="panel-heading">
+            <div>
+              <h2>Intentional invalid cases</h2>
+              <p>
+                Every mutation requested by the invalid percentage is recorded;
+                zero means all generated values satisfy the focused model.
+              </p>
+            </div>
+            <span className="count-pill">{dataset.violations.length}</span>
+          </div>
+          {dataset.violations.length ? (
+            <ul className="violation-list">
+              {dataset.violations.slice(0, 1_000).map((violation, index) => (
+                <li
+                  key={`${violation.table}-${violation.row}-${violation.field}-${index}`}
+                >
+                  <code>
+                    {violation.table}[{violation.row}].{violation.field}
+                  </code>
+                  <strong>{violation.rule}</strong>
+                </li>
+              ))}
+            </ul>
+          ) : (
+            <p className="empty">No invalid cases were requested.</p>
+          )}
+        </section>
+      ) : null}
+    </main>
+  );
+}

src/main.tsx

@@ -0,0 +1,18 @@
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import { App } from "./App";
+
+createRoot(document.getElementById("root")!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+);
+
+if ("serviceWorker" in navigator && import.meta.env.PROD) {
+  window.addEventListener("load", () => {
+    const url = new URL("./sw.js", document.baseURI);
+    void navigator.serviceWorker
+      .register(url, { scope: new URL("./", document.baseURI).pathname })
+      .catch(() => undefined);
+  });
+}

src/styles.css

@@ -0,0 +1,498 @@
+:root {
+  font-family:
+    Inter,
+    ui-sans-serif,
+    system-ui,
+    -apple-system,
+    BlinkMacSystemFont,
+    "Segoe UI",
+    sans-serif;
+  color: #242233;
+  background: #f3f4f8;
+  font-synthesis: none;
+  --surface: #fff;
+  --surface-muted: #f3f1fa;
+  --line: #d8d6e5;
+  --ink-muted: #66637a;
+  --accent: #5b4ec4;
+  --accent-dark: #4336a4;
+  --danger: #a5263d;
+  --warning: #8a5700;
+  --success: #187148;
+}
+
+:root[data-toolbox-theme="dark"] {
+  color: #f0eff8;
+  background: #15141b;
+  --surface: #211f29;
+  --surface-muted: #2a2735;
+  --line: #454153;
+  --ink-muted: #b9b5c8;
+  --accent: #a99cff;
+  --accent-dark: #c0b7ff;
+  --danger: #ff91a2;
+  --warning: #ffd078;
+  --success: #78d7a9;
+}
+
+@media (prefers-color-scheme: dark) {
+  :root:not([data-toolbox-theme="light"]) {
+    color: #f0eff8;
+    background: #15141b;
+    --surface: #211f29;
+    --surface-muted: #2a2735;
+    --line: #454153;
+    --ink-muted: #b9b5c8;
+    --accent: #a99cff;
+    --accent-dark: #c0b7ff;
+    --danger: #ff91a2;
+    --warning: #ffd078;
+    --success: #78d7a9;
+  }
+}
+
+* {
+  box-sizing: border-box;
+}
+
+body {
+  min-width: 320px;
+  min-height: 100vh;
+  margin: 0;
+  background: inherit;
+  color: inherit;
+}
+
+button,
+input,
+select,
+textarea {
+  color: inherit;
+  font: inherit;
+}
+
+button,
+.button,
+input,
+select,
+textarea {
+  border: 1px solid var(--line);
+  border-radius: 0.72rem;
+  background: var(--surface);
+}
+
+button,
+.button {
+  min-height: 2.65rem;
+  padding: 0.58rem 0.9rem;
+  cursor: pointer;
+  font-weight: 750;
+}
+
+button:hover,
+.button:hover {
+  border-color: var(--accent);
+}
+
+button:disabled {
+  cursor: not-allowed;
+  opacity: 0.55;
+}
+
+button:focus-visible,
+input:focus-visible,
+select:focus-visible,
+textarea:focus-visible,
+.button:focus-within {
+  outline: 3px solid color-mix(in srgb, var(--accent) 36%, transparent);
+  outline-offset: 2px;
+}
+
+input,
+select,
+textarea {
+  width: 100%;
+  min-height: 2.55rem;
+  padding: 0.55rem 0.65rem;
+}
+
+textarea {
+  resize: vertical;
+  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
+  font-size: 0.84rem;
+  line-height: 1.5;
+  tab-size: 2;
+}
+
+.workbench {
+  width: min(100%, 90rem);
+  margin: 0 auto;
+  padding: 1.4rem clamp(0.75rem, 2.5vw, 2rem) 3rem;
+}
+
+.hero,
+.panel-heading,
+.source-grid,
+.option-grid,
+.tabs,
+.workspace-grid,
+.range-inputs {
+  display: flex;
+}
+
+.hero {
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 1.2rem;
+  margin-bottom: 1rem;
+}
+
+h1,
+h2,
+h3,
+p {
+  margin-top: 0;
+}
+
+h1 {
+  margin-bottom: 0.35rem;
+  font-size: clamp(1.85rem, 4vw, 3rem);
+}
+
+h2 {
+  margin-bottom: 0;
+  font-size: 1.16rem;
+}
+
+.hero > div > p:last-child {
+  max-width: 52rem;
+  margin-bottom: 0;
+  color: var(--ink-muted);
+}
+
+.eyebrow {
+  margin-bottom: 0.28rem;
+  color: var(--accent-dark);
+  font-size: 0.74rem;
+  font-weight: 850;
+  letter-spacing: 0.09em;
+  text-transform: uppercase;
+}
+
+.privacy-pill,
+.count-pill {
+  flex: none;
+  border: 1px solid color-mix(in srgb, var(--success) 48%, var(--line));
+  border-radius: 999px;
+  padding: 0.48rem 0.72rem;
+  color: var(--success);
+  font-size: 0.8rem;
+  font-weight: 800;
+}
+
+.panel {
+  margin-bottom: 0.85rem;
+  border: 1px solid var(--line);
+  border-radius: 1rem;
+  background: var(--surface);
+  box-shadow: 0 0.45rem 1.4rem color-mix(in srgb, #151126 7%, transparent);
+  padding: 1rem;
+}
+
+.panel-heading {
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.85rem;
+  margin-bottom: 0.85rem;
+}
+
+.panel-heading p {
+  margin: 0.2rem 0 0;
+  color: var(--ink-muted);
+  font-size: 0.88rem;
+}
+
+.file-button {
+  position: relative;
+  display: inline-flex;
+  align-items: center;
+  white-space: nowrap;
+}
+
+.file-button input {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  overflow: hidden;
+  clip: rect(0 0 0 0);
+}
+
+.source-grid,
+.option-grid {
+  align-items: end;
+  flex-wrap: wrap;
+  gap: 0.65rem;
+  margin-bottom: 0.72rem;
+}
+
+.source-grid label,
+.option-grid label,
+.panel-heading label {
+  display: grid;
+  gap: 0.28rem;
+  min-width: 10rem;
+  color: var(--ink-muted);
+  font-size: 0.8rem;
+  font-weight: 750;
+}
+
+.source-grid label {
+  flex: 1 1 14rem;
+}
+
+.option-grid label {
+  flex: 1 1 10rem;
+}
+
+.primary-button {
+  border-color: var(--accent);
+  background: var(--accent);
+  color: #fff;
+}
+
+:root[data-toolbox-theme="dark"] .primary-button {
+  color: #17131f;
+}
+
+.tabs {
+  gap: 0.35rem;
+  overflow-x: auto;
+  margin: 0 0 0.85rem;
+  padding: 0.1rem 0;
+}
+
+.tabs button {
+  white-space: nowrap;
+}
+
+.tabs button[aria-pressed="true"] {
+  border-color: var(--accent);
+  background: var(--surface-muted);
+  color: var(--accent-dark);
+}
+
+.workspace-grid {
+  align-items: stretch;
+  gap: 0.85rem;
+}
+
+.workspace-grid > * {
+  min-width: 0;
+  flex: 1 1 0;
+}
+
+.table-scroll {
+  max-width: 100%;
+  overflow: auto;
+  border: 1px solid var(--line);
+  border-radius: 0.8rem;
+}
+
+.table-scroll:focus-visible {
+  outline: 3px solid color-mix(in srgb, var(--accent) 36%, transparent);
+}
+
+table {
+  width: 100%;
+  border-collapse: collapse;
+  font-size: 0.84rem;
+}
+
+th,
+td {
+  border-bottom: 1px solid var(--line);
+  padding: 0.55rem;
+  text-align: left;
+  vertical-align: top;
+}
+
+thead th {
+  position: sticky;
+  top: 0;
+  z-index: 1;
+  background: var(--surface-muted);
+  white-space: nowrap;
+}
+
+tbody tr:last-child > * {
+  border-bottom: 0;
+}
+
+.field-table {
+  min-width: 70rem;
+}
+
+.field-table input,
+.field-table select {
+  min-width: 8rem;
+}
+
+.flag-cell label {
+  display: flex;
+  align-items: center;
+  gap: 0.35rem;
+  white-space: nowrap;
+}
+
+.flag-cell label + label {
+  margin-top: 0.4rem;
+}
+
+.flag-cell input {
+  width: auto;
+  min-height: 0;
+}
+
+.range-inputs {
+  gap: 0.35rem;
+}
+
+.range-inputs input {
+  min-width: 6rem;
+}
+
+.icon-button {
+  min-height: 2.3rem;
+  padding: 0.4rem 0.62rem;
+  font-size: 0.78rem;
+}
+
+.danger {
+  color: var(--danger);
+}
+
+.records {
+  max-height: 42rem;
+}
+
+.records td {
+  max-width: 18rem;
+  overflow-wrap: anywhere;
+  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
+}
+
+.export-panel textarea {
+  min-height: 30rem;
+}
+
+.violation-list {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
+  gap: 0.55rem;
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+.violation-list li {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.7rem;
+  border: 1px solid color-mix(in srgb, var(--danger) 38%, var(--line));
+  border-radius: 0.7rem;
+  padding: 0.58rem;
+}
+
+.violation-list strong {
+  color: var(--danger);
+  font-size: 0.78rem;
+}
+
+.warning,
+.error,
+.success,
+.empty {
+  margin: 0.65rem 0 0;
+  font-size: 0.88rem;
+}
+
+.warning {
+  color: var(--warning);
+}
+
+.error {
+  border: 1px solid color-mix(in srgb, var(--danger) 45%, var(--line));
+  border-radius: 0.72rem;
+  background: color-mix(in srgb, var(--danger) 8%, var(--surface));
+  padding: 0.66rem;
+  color: var(--danger);
+}
+
+.success {
+  color: var(--success);
+}
+
+.empty {
+  color: var(--ink-muted);
+}
+
+.top-gap {
+  margin-top: 0.75rem;
+}
+
+.loading,
+.fatal {
+  width: min(100%, 90rem);
+  margin: 2rem auto;
+  padding: 1rem;
+}
+
+.help-dialog {
+  width: min(38rem, calc(100vw - 2rem));
+  border: 1px solid var(--line);
+  border-radius: 1rem;
+  background: var(--surface);
+  color: inherit;
+  padding: 1rem;
+}
+
+.help-dialog::backdrop {
+  background: rgb(16 14 25 / 58%);
+}
+
+.dialog-heading {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 1rem;
+}
+
+@media (max-width: 860px) {
+  .hero,
+  .workspace-grid {
+    flex-direction: column;
+  }
+
+  .privacy-pill {
+    align-self: flex-start;
+  }
+
+  .workspace-grid > * {
+    width: 100%;
+  }
+
+  .panel-heading {
+    align-items: flex-start;
+    flex-wrap: wrap;
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  *,
+  *::before,
+  *::after {
+    scroll-behavior: auto !important;
+    transition: none !important;
+  }
+}

src/test/setup.ts

@@ -0,0 +1,8 @@
+import "@testing-library/jest-dom/vitest";
+import { afterEach } from "vitest";
+import { cleanup } from "@testing-library/react";
+
+afterEach(() => {
+  cleanup();
+  localStorage.clear();
+});

src/toolbox/manifest.source.json

@@ -0,0 +1,41 @@
+{
+  "$schema": "https://git.add-ideas.de/lotobo/toolbox-sdk/raw/branch/main/schemas/toolbox-app.v1.schema.json",
+  "schemaVersion": 1,
+  "id": "de.add-ideas.fixture-tools",
+  "name": "Fixture Tools",
+  "version": "0.1.0",
+  "description": "Generate deterministic synthetic test data locally.",
+  "entry": "./",
+  "icon": "./favicon.svg",
+  "categories": ["developer", "data", "productivity"],
+  "tags": ["fixtures", "synthetic-data", "schema", "csv", "sql", "testing"],
+  "integration": {
+    "contextVersion": 1,
+    "launchModes": ["navigate", "new-tab"],
+    "embedding": "unsupported"
+  },
+  "requirements": {
+    "secureContext": false,
+    "workers": false,
+    "indexedDb": false,
+    "crossOriginIsolated": false,
+    "topLevelContext": false
+  },
+  "privacy": {
+    "processing": "local",
+    "fileUploads": true,
+    "telemetry": false,
+    "label": "Inputs stay in this browser; nothing is uploaded."
+  },
+  "source": {
+    "repository": "https://git.add-ideas.de/lotobo/fixture-tools",
+    "license": "GPL-3.0-or-later"
+  },
+  "actions": [
+    {
+      "id": "source",
+      "label": "Source",
+      "url": "https://git.add-ideas.de/lotobo/fixture-tools"
+    }
+  ]
+}

src/toolbox/manifest.ts

@@ -0,0 +1,4 @@
+import { defineToolboxApp, parseToolboxApp } from "@add-ideas/toolbox-contract";
+import source from "./manifest.source.json";
+
+export const manifest = defineToolboxApp(parseToolboxApp(source));

src/version.ts

@@ -0,0 +1 @@
+export const APP_VERSION = "0.1.0";

src/vite-env.d.ts

@@ -0,0 +1 @@
+/// <reference types="vite/client" />

tests/browser/app.spec.ts

@@ -0,0 +1,103 @@
+import { expect, test, type Page } from "@playwright/test";
+
+const ORIGIN = "http://127.0.0.1:4194";
+async function watchLocalOnly(page: Page) {
+  const external: string[] = [];
+  await page.route("**/*", async (route) => {
+    const url = new URL(route.request().url());
+    if (url.origin !== ORIGIN) {
+      external.push(url.href);
+      await route.abort();
+    } else await route.continue();
+  });
+  return external;
+}
+
+test("runs at a nested path and generates deterministic relational data", async ({
+  page,
+}) => {
+  await page.setViewportSize({ width: 1800, height: 1000 });
+  const external = await watchLocalOnly(page);
+  await page.goto("/deep/nested/fixture/");
+  await expect(
+    page.getByRole("heading", { name: "Fixture Tools" }),
+  ).toBeVisible();
+  await page.getByRole("button", { name: "Generate fixtures" }).click();
+  await expect(
+    page.getByRole("heading", { name: "Generated records" }),
+  ).toBeVisible();
+  await page.getByLabel("Data table").selectOption("orders");
+  await expect(
+    page.getByRole("columnheader", { name: "user_id" }),
+  ).toBeVisible();
+  expect(external).toEqual([]);
+  expect(
+    await page
+      .locator(".toolbox-shell__main")
+      .evaluate((node) => getComputedStyle(node).width),
+  ).toBe("1440px");
+});
+
+test("imports CSV headings and exports an inspectable model", async ({
+  page,
+}) => {
+  await page.goto("/deep/nested/fixture/");
+  await page.getByLabel("Source kind").selectOption("csv");
+  await page.getByLabel("Fixture model source").fill("id,email,active\n");
+  await page.getByRole("button", { name: "Import model" }).click();
+  await expect(
+    page.getByRole("heading", { name: "Editable field model" }),
+  ).toBeVisible();
+  await expect(page.getByLabel("email type")).toHaveValue("email");
+  const pending = page.waitForEvent("download");
+  await page.getByRole("button", { name: "Export model" }).click();
+  expect((await pending).suggestedFilename()).toBe("fixture-model.json");
+});
+
+test("retains results after a failed import and downloads output", async ({
+  page,
+}) => {
+  await page.goto("/deep/nested/fixture/");
+  await page.getByLabel("Source kind").selectOption("json-schema");
+  await page.getByLabel("Fixture model source").fill("{");
+  await page.getByRole("button", { name: "Import model" }).click();
+  await expect(page.getByRole("alert")).toContainText("retained");
+  await page.getByRole("button", { name: "Data" }).click();
+  const pending = page.waitForEvent("download");
+  await page.getByRole("button", { name: "Download JSON" }).click();
+  expect((await pending).suggestedFilename()).toBe("fixtures.json");
+});
+
+test("integrates help, themes, PWA identity and hardened headers", async ({
+  page,
+  request,
+}) => {
+  await page.goto("/deep/nested/fixture/");
+  await page.getByRole("button", { name: "Help" }).click();
+  await expect(
+    page.getByRole("dialog", { name: "About Fixture Tools" }),
+  ).toContainText("synthetic");
+  await page.keyboard.press("Escape");
+  await page.getByRole("button", { name: "Personalize" }).click();
+  await page.getByRole("button", { name: "Dark" }).click();
+  await expect(page.locator(".toolbox-shell").first()).toHaveAttribute(
+    "data-toolbox-theme",
+    "dark",
+  );
+  expect(
+    await page.evaluate(async () =>
+      Boolean(await navigator.serviceWorker.ready),
+    ),
+  ).toBe(true);
+  const index = await request.get("/deep/nested/fixture/");
+  expect(index.headers()["content-security-policy"]).toContain(
+    "connect-src 'self'",
+  );
+  expect(await index.text()).not.toMatch(/\b(?:src|href)=["']\//u);
+  const manifest = await request.get("/deep/nested/fixture/toolbox-app.json");
+  await expect(manifest.json()).resolves.toMatchObject({
+    id: "de.add-ideas.fixture-tools",
+    version: "0.1.0",
+    privacy: { processing: "local", telemetry: false },
+  });
+});

tests/components/app.test.tsx

@@ -0,0 +1,37 @@
+import { render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { describe, expect, it } from "vitest";
+import { Workbench } from "../../src/components/Workbench";
+
+describe("Fixture workbench", () => {
+  it("generates records and exposes intentional invalid cases", async () => {
+    const user = userEvent.setup();
+    render(<Workbench />);
+    expect(
+      screen.getByRole("heading", { name: "Fixture Tools" }),
+    ).toBeInTheDocument();
+    const invalid = screen.getByLabelText("Intentional invalids (%)");
+    await user.clear(invalid);
+    await user.type(invalid, "100");
+    await user.click(screen.getByRole("button", { name: "Generate fixtures" }));
+    await user.click(screen.getByRole("button", { name: /Invalid cases/u }));
+    expect(
+      screen.getAllByText(/required|unique|foreignKey/u).length,
+    ).toBeGreaterThan(0);
+  });
+
+  it("retains the active model after malformed input", async () => {
+    const user = userEvent.setup();
+    render(<Workbench />);
+    await user.selectOptions(
+      screen.getByLabelText("Source kind"),
+      "json-schema",
+    );
+    const source = screen.getByLabelText("Fixture model source");
+    await user.clear(source);
+    await user.type(source, "{{");
+    await user.click(screen.getByRole("button", { name: "Import model" }));
+    expect(screen.getByRole("alert")).toHaveTextContent(/retained/u);
+    expect(screen.getByLabelText("Data table")).toHaveValue("users");
+  });
+});

tests/fixture/model.test.ts

@@ -0,0 +1,178 @@
+import { describe, expect, it } from "vitest";
+import {
+  generateFixtures,
+  modelJson,
+  parseFixtureModel,
+  serializeDataset,
+  type GeneratedDataset,
+} from "../../src/fixture/model";
+
+const SQL = `CREATE TABLE users (
+  id INTEGER PRIMARY KEY,
+  email VARCHAR(80) NOT NULL UNIQUE,
+  score DECIMAL(5,2)
+);
+CREATE TABLE orders (
+  id INTEGER PRIMARY KEY,
+  user_id INTEGER NOT NULL REFERENCES users(id)
+);`;
+
+describe("fixture model", () => {
+  it("imports focused SQL constraints and preserves foreign keys", () => {
+    const parsed = parseFixtureModel(SQL, "sql");
+    expect(parsed.model.tables).toHaveLength(2);
+    expect(parsed.model.tables[0]?.fields[0]).toMatchObject({
+      name: "id",
+      type: "integer",
+      required: true,
+      unique: true,
+      distribution: "sequential",
+    });
+    expect(parsed.model.tables[0]?.fields[1]).toMatchObject({
+      name: "email",
+      type: "email",
+      unique: true,
+      maxLength: 80,
+    });
+    expect(parsed.model.tables[1]?.fields[1]).toMatchObject({
+      type: "foreignKey",
+      reference: "users.id",
+    });
+  });
+
+  it("generates replayable records with referential integrity", () => {
+    const model = parseFixtureModel(SQL, "sql").model;
+    const options = {
+      seed: "repeat-me",
+      rows: 20,
+      boundaryPercent: 15,
+      invalidPercent: 0,
+    };
+    const first = generateFixtures(model, options);
+    const second = generateFixtures(model, options);
+    expect(first).toEqual(second);
+    expect(
+      generateFixtures(model, { ...options, seed: "different" }),
+    ).not.toEqual(first);
+    const ids = new Set(first.tables.users?.map((row) => row.id));
+    expect(first.tables.orders?.every((row) => ids.has(row.user_id))).toBe(
+      true,
+    );
+    expect(new Set(first.tables.users?.map((row) => row.email)).size).toBe(20);
+  });
+
+  it("imports JSON Schema bounds and round-trips the editable model", () => {
+    const parsed = parseFixtureModel(
+      JSON.stringify({
+        title: "People",
+        type: "object",
+        required: ["age"],
+        properties: {
+          age: { type: "integer", minimum: 18, maximum: 90 },
+          state: { enum: ["draft", "active"] },
+          nickname: { type: "string", minLength: 2, maxLength: 8 },
+        },
+      }),
+      "json-schema",
+    );
+    expect(parsed.model.tables[0]).toMatchObject({ name: "People" });
+    expect(parsed.model.tables[0]?.fields[0]).toMatchObject({
+      minimum: 18,
+      maximum: 90,
+      required: true,
+    });
+    expect(
+      parseFixtureModel(modelJson(parsed.model), "fixture-model").model,
+    ).toEqual(parsed.model);
+  });
+
+  it("records every intentional mutation and emits common formats", () => {
+    const model = parseFixtureModel("id,email\n", "csv").model;
+    const dataset = generateFixtures(model, {
+      seed: "invalid",
+      rows: 3,
+      boundaryPercent: 0,
+      invalidPercent: 100,
+    });
+    expect(dataset.violations).toHaveLength(6);
+    expect(serializeDataset(dataset, "json")).toMatch(/^\[/u);
+    expect(serializeDataset(dataset, "ndjson").trim().split("\n")).toHaveLength(
+      3,
+    );
+    expect(serializeDataset(dataset, "xml")).toContain("<fixtures");
+    expect(serializeDataset(dataset, "sql")).toContain('INSERT INTO "records"');
+  });
+
+  it("makes CSV spreadsheet-safe and quotes SQL literals", () => {
+    const dataset: GeneratedDataset = {
+      seed: "safe",
+      rowsPerTable: 1,
+      tables: {
+        records: [{ value: '=HYPERLINK("https://invalid")', quote: "O'Brien" }],
+      },
+      violations: [],
+    };
+    expect(serializeDataset(dataset, "csv")).toContain("'=HYPERLINK");
+    expect(serializeDataset(dataset, "sql")).toContain("O''Brien");
+  });
+
+  it("imports bounded XSD and rejects active document declarations", () => {
+    const xsd = `<?xml version="1.0"?><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="people"><xs:complexType><xs:sequence><xs:element name="age" type="xs:integer"/><xs:element name="email" type="xs:string" minOccurs="0"/></xs:sequence></xs:complexType></xs:element></xs:schema>`;
+    const parsed = parseFixtureModel(xsd, "xsd");
+    expect(parsed.model.tables[0]?.fields).toMatchObject([
+      { name: "age", type: "integer", required: true },
+      { name: "email", required: false },
+    ]);
+    expect(() =>
+      parseFixtureModel('<!DOCTYPE x [<!ENTITY y "z">]><x/>', "xsd"),
+    ).toThrow(/DOCTYPE/u);
+  });
+
+  it("rejects misleading recipes and caps wide generations", () => {
+    expect(() =>
+      parseFixtureModel(
+        JSON.stringify({
+          tables: [
+            {
+              name: "records",
+              fields: [
+                {
+                  name: "id",
+                  type: "integer",
+                  required: true,
+                  unique: true,
+                  distribution: "constant",
+                  constant: "wrong type",
+                },
+              ],
+            },
+          ],
+        }),
+        "fixture-model",
+      ),
+    ).toThrow(/constant/u);
+
+    const wide = {
+      tables: [
+        {
+          name: "wide",
+          fields: Array.from({ length: 100 }, (_unused, index) => ({
+            name: `field_${index}`,
+            type: "string" as const,
+            required: true,
+            unique: false,
+            distribution: "sequential" as const,
+          })),
+        },
+      ],
+    };
+    expect(() =>
+      generateFixtures(wide, {
+        seed: "bounded",
+        rows: 1_001,
+        boundaryPercent: 0,
+        invalidPercent: 0,
+      }),
+    ).toThrow(/100,000 field values/u);
+  });
+});

tsconfig.app.json

@@ -0,0 +1,27 @@
+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
+    "target": "ES2023",
+    "lib": ["ES2023", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "types": ["vite/client"],
+    "allowArbitraryExtensions": true,
+    "skipLibCheck": true,
+    "moduleResolution": "Bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true,
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "useDefineForClassFields": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true
+  },
+  "include": ["src", "tests"]
+}

tsconfig.json

@@ -0,0 +1,11 @@
+{
+  "files": [],
+  "references": [
+    {
+      "path": "./tsconfig.app.json"
+    },
+    {
+      "path": "./tsconfig.node.json"
+    }
+  ]
+}

tsconfig.node.json

@@ -0,0 +1,24 @@
+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
+    "target": "ES2023",
+    "lib": ["ES2023"],
+    "module": "ESNext",
+    "types": ["node"],
+    "skipLibCheck": true,
+    "moduleResolution": "Bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true
+  },
+  "include": [
+    "vite.config.ts",
+    "playwright.config.ts",
+    "eslint.config.mjs",
+    "scripts/**/*.mjs"
+  ]
+}

vite.config.ts

@@ -0,0 +1,16 @@
+/// <reference types="vitest/config" />
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+
+export default defineConfig({
+  base: "./",
+  plugins: [react()],
+  test: {
+    environment: "jsdom",
+    setupFiles: "./src/test/setup.ts",
+    css: true,
+    maxWorkers: 2,
+    restoreMocks: true,
+    exclude: ["tests/browser/**", "node_modules/**", "dist/**"],
+  },
+});