Release Fixture Tools 0.2.0

2026-09-02 13:00:37 +02:00
22 changed files with 1007 additions and 126 deletions
@@ -0,0 +1,39 @@
+name: Verify
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: verify-${{ gitea.repository }}-${{ gitea.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    env:
+      CI: "true"
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: npm
+      - name: Select declared npm version
+        run: npm install --global npm@11.17.0
+      - name: Install dependencies
+        run: npm ci
+      - name: Audit runtime dependencies
+        run: npm audit --omit=dev --audit-level=moderate
+      - name: Check, test, and build
+        run: npm run check
+      - name: Install browser engines
+        run: npx playwright install --with-deps chromium firefox webkit
+      - name: Browser tests
+        run: npm run test:browser
@@ -1,5 +1,10 @@
 # Changelog

+## 0.2.0 - 2026-09-02
+
+- Add reusable provider definitions, richer relational constraints and
+  deterministic cross-table generation with explicit violation evidence.
+
 ## 0.1.0 - 2026-09-01

 - Add bounded JSON Schema, SQL DDL, XSD, CSV-heading, and fixture-recipe import
@@ -3,18 +3,25 @@
 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
+## v0.2.0 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
+  numeric and length ranges, enumerations, scalar foreign keys, composite
+  unique constraints, and composite 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
+- Generate tables in a deterministic dependency-topological order, with an
+  explicit error for cyclic references
+- Audit positive, boundary and intentional-negative exercise counts in a
+  constraint coverage matrix
+- Select deterministic provider profiles (person, network, commerce), with a
+  typed extension point for additional local profiles
 - Export JSON, spreadsheet-safe CSV, NDJSON, XML, SQL `INSERT` statements, or a
  reusable fixture recipe
 - Use only reserved example domains for generated email addresses
@@ -24,8 +31,9 @@ browser. Fixture Tools is a local-first module in the add·ideas Toolbox.
 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.
+dialects beyond common table/column clauses, cyclic relational recipes, and
+production-scale data loads are out of scope in v0.2.0. Coverage counts describe
+generated exercises; they do not prove schema or application coverage.

 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
@@ -1,7 +1,7 @@
 # Corresponding source

-The corresponding source for Fixture Tools 0.1.0 is available at:
+The corresponding source for Fixture Tools 0.2.0 is available at:

-https://git.add-ideas.de/lotobo/fixture-tools/src/tag/v0.1.0
+https://git.add-ideas.de/lotobo/fixture-tools/src/tag/v0.2.0

 Build with Node.js 22, npm 11, `npm ci`, and `npm run release:artifact`.
@@ -1,12 +1,12 @@
 # Third-party notices

-Fixture Tools 0.1.0 directly depends on these runtime packages:
+Fixture Tools 0.2.0 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       |
+| `@add-ideas/toolbox-contract`    |          0.3.0 | Apache-2.0       |
+| `@add-ideas/toolbox-helpers`     |          0.2.0 | GPL-3.0-or-later |
+| `@add-ideas/toolbox-shell-react` |          0.3.0 | Apache-2.0       |
 | `react`                          |         19.2.8 | MIT              |
 | `react-dom`                      |         19.2.8 | MIT              |

@@ -1,22 +1,22 @@
 {
  "name": "fixture-tools",
-  "version": "0.1.0",
+  "version": "0.2.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "fixture-tools",
-      "version": "0.1.0",
+      "version": "0.2.0",
      "license": "GPL-3.0-or-later",
      "dependencies": {
-        "@add-ideas/toolbox-contract": "0.2.3",
-        "@add-ideas/toolbox-helpers": "0.1.0",
-        "@add-ideas/toolbox-shell-react": "0.2.3",
+        "@add-ideas/toolbox-contract": "0.3.0",
+        "@add-ideas/toolbox-helpers": "0.2.0",
+        "@add-ideas/toolbox-shell-react": "0.3.0",
        "react": "19.2.8",
        "react-dom": "19.2.8"
      },
      "devDependencies": {
-        "@add-ideas/toolbox-testkit": "0.2.3",
+        "@add-ideas/toolbox-testkit": "0.3.0",
        "@eslint/js": "10.0.1",
        "@playwright/test": "1.62.1",
        "@testing-library/jest-dom": "6.9.1",
@@ -42,24 +42,25 @@
      }
    },
    "node_modules/@add-ideas/toolbox-contract": {
-      "version": "0.2.3",
-      "license": "Apache-2.0",
-      "engines": {
-        "node": ">=20"
-      }
+      "version": "0.3.0",
+      "resolved": "https://git.add-ideas.de/api/packages/lotobo/npm/%40add-ideas%2Ftoolbox-contract/-/0.3.0/toolbox-contract-0.3.0.tgz",
+      "integrity": "sha512-dKrK7BjOFwqJaBfJuhKxZKIld4sH0AKjEn6a0yLnbdMUFY+fFv4VSLGV2tNSBD016gumc2iNqOjUj/ld7x4rtA==",
+      "license": "Apache-2.0"
    },
    "node_modules/@add-ideas/toolbox-helpers": {
-      "version": "0.1.0",
+      "version": "0.2.0",
      "license": "GPL-3.0-or-later",
      "engines": {
        "node": ">=22"
      }
    },
    "node_modules/@add-ideas/toolbox-shell-react": {
-      "version": "0.2.3",
+      "version": "0.3.0",
+      "resolved": "https://git.add-ideas.de/api/packages/lotobo/npm/%40add-ideas%2Ftoolbox-shell-react/-/0.3.0/toolbox-shell-react-0.3.0.tgz",
+      "integrity": "sha512-74p6JzAOG0YCAKdlc1hLofV4ZIko7vb448S75cIiM88PKm93EHl5VD7g8YVyfM56Ui97UY9dmy+Whiq4sGzpsg==",
      "license": "Apache-2.0",
      "dependencies": {
-        "@add-ideas/toolbox-contract": "0.2.3"
+        "@add-ideas/toolbox-contract": "0.3.0"
      },
      "peerDependencies": {
        "react": ">=18 <20",
@@ -67,17 +68,16 @@
      }
    },
    "node_modules/@add-ideas/toolbox-testkit": {
-      "version": "0.2.3",
+      "version": "0.3.0",
+      "resolved": "https://git.add-ideas.de/api/packages/lotobo/npm/%40add-ideas%2Ftoolbox-testkit/-/0.3.0/toolbox-testkit-0.3.0.tgz",
+      "integrity": "sha512-4Fk+oSvZFspOMIXr8Xy040nhAaBsIQAzsGyXWSpjn3+k3yBKq7nB1r5zCHhsXzfdLzvPDAx2KcmSNOhM330D9w==",
      "dev": true,
      "license": "Apache-2.0",
      "dependencies": {
-        "@add-ideas/toolbox-contract": "0.2.3"
+        "@add-ideas/toolbox-contract": "0.3.0"
      },
      "bin": {
        "toolbox-check": "dist/cli.js"
-      },
-      "engines": {
-        "node": ">=20"
      }
    },
    "node_modules/@adobe/css-tools": {
@@ -1,6 +1,6 @@
 {
  "name": "fixture-tools",
-  "version": "0.1.0",
+  "version": "0.2.0",
  "description": "Generate deterministic, privacy-safe synthetic test fixtures locally in the browser.",
  "license": "GPL-3.0-or-later",
  "author": "Albrecht Degering",
@@ -39,14 +39,14 @@
    "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",
+    "@add-ideas/toolbox-contract": "0.3.0",
+    "@add-ideas/toolbox-helpers": "0.2.0",
+    "@add-ideas/toolbox-shell-react": "0.3.0",
    "react": "19.2.8",
    "react-dom": "19.2.8"
  },
  "devDependencies": {
-    "@add-ideas/toolbox-testkit": "0.2.3",
+    "@add-ideas/toolbox-testkit": "0.3.0",
    "@eslint/js": "10.0.1",
    "@playwright/test": "1.62.1",
    "@testing-library/jest-dom": "6.9.1",
@@ -15,7 +15,25 @@ export default defineConfig({
    timeout: 180_000,
  },
  projects: [
-    { name: "chromium", use: { ...devices["Desktop Chrome"] } },
-    { name: "firefox", use: { ...devices["Desktop Firefox"] } },
+    {
+      name: "chromium",
+      testIgnore: /responsive\.spec\.ts/,
+      use: { ...devices["Desktop Chrome"] },
+    },
+    {
+      name: "firefox",
+      testIgnore: /responsive\.spec\.ts/,
+      use: { ...devices["Desktop Firefox"] },
+    },
+    {
+      name: "webkit",
+      testIgnore: /responsive\.spec\.ts/,
+      use: { ...devices["Desktop Safari"] },
+    },
+    {
+      name: "mobile-chromium",
+      testMatch: /responsive\.spec\.ts/,
+      use: { ...devices["Pixel 5"] },
+    },
  ],
 });
@@ -1,5 +1,10 @@
 # Changelog

+## 0.2.0 - 2026-09-02
+
+- Add reusable provider definitions, richer relational constraints and
+  deterministic cross-table generation with explicit violation evidence.
+
 ## 0.1.0 - 2026-09-01

 - Add bounded JSON Schema, SQL DDL, XSD, CSV-heading, and fixture-recipe import
@@ -1,5 +1,5 @@
 ==============================================================================
-@add-ideas/toolbox-contract@0.2.3
+@add-ideas/toolbox-contract@0.3.0
 Declared licence: Apache-2.0
 ==============================================================================
 --- LICENSE ---
@@ -198,7 +198,7 @@ Declared licence: Apache-2.0


 ==============================================================================
-@add-ideas/toolbox-helpers@0.1.0
+@add-ideas/toolbox-helpers@0.2.0
 Declared licence: GPL-3.0-or-later
 ==============================================================================
 --- LICENSE ---
@@ -879,7 +879,7 @@ Public License instead of this License.  But first, please read


 ==============================================================================
-@add-ideas/toolbox-shell-react@0.2.3
+@add-ideas/toolbox-shell-react@0.3.0
 Declared licence: Apache-2.0
 ==============================================================================
 --- LICENSE ---
@@ -3,18 +3,25 @@
 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
+## v0.2.0 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
+  numeric and length ranges, enumerations, scalar foreign keys, composite
+  unique constraints, and composite 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
+- Generate tables in a deterministic dependency-topological order, with an
+  explicit error for cyclic references
+- Audit positive, boundary and intentional-negative exercise counts in a
+  constraint coverage matrix
+- Select deterministic provider profiles (person, network, commerce), with a
+  typed extension point for additional local profiles
 - Export JSON, spreadsheet-safe CSV, NDJSON, XML, SQL `INSERT` statements, or a
  reusable fixture recipe
 - Use only reserved example domains for generated email addresses
@@ -24,8 +31,9 @@ browser. Fixture Tools is a local-first module in the add·ideas Toolbox.
 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.
+dialects beyond common table/column clauses, cyclic relational recipes, and
+production-scale data loads are out of scope in v0.2.0. Coverage counts describe
+generated exercises; they do not prove schema or application coverage.

 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
@@ -1,7 +1,7 @@
 # Corresponding source

-The corresponding source for Fixture Tools 0.1.0 is available at:
+The corresponding source for Fixture Tools 0.2.0 is available at:

-https://git.add-ideas.de/lotobo/fixture-tools/src/tag/v0.1.0
+https://git.add-ideas.de/lotobo/fixture-tools/src/tag/v0.2.0

 Build with Node.js 22, npm 11, `npm ci`, and `npm run release:artifact`.
@@ -1,12 +1,12 @@
 # Third-party notices

-Fixture Tools 0.1.0 directly depends on these runtime packages:
+Fixture Tools 0.2.0 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       |
+| `@add-ideas/toolbox-contract`    |          0.3.0 | Apache-2.0       |
+| `@add-ideas/toolbox-helpers`     |          0.2.0 | GPL-3.0-or-later |
+| `@add-ideas/toolbox-shell-react` |          0.3.0 | Apache-2.0       |
 | `react`                          |         19.2.8 | MIT              |
 | `react-dom`                      |         19.2.8 | MIT              |

@@ -1,5 +1,5 @@
 const CACHE_PREFIX = "fixture-tools-shell-";
-const CACHE_NAME = CACHE_PREFIX + "0.1.0";
+const CACHE_NAME = CACHE_PREFIX + "0.2.0";
 const CORE = ["./", "./manifest.webmanifest", "./favicon.svg"];
 self.addEventListener("install", (event) => {
  event.waitUntil(
@@ -3,7 +3,7 @@
  "schemaVersion": 1,
  "id": "de.add-ideas.fixture-tools",
  "name": "Fixture Tools",
-  "version": "0.1.0",
+  "version": "0.2.0",
  "description": "Generate deterministic synthetic test data locally.",
  "entry": "./",
  "icon": "./favicon.svg",
@@ -21,6 +21,22 @@
    "crossOriginIsolated": false,
    "topLevelContext": false
  },
+  "io": {
+    "accepts": [
+      { "mediaType": "application/schema+json", "extensions": [".json"] },
+      { "mediaType": "application/sql", "extensions": [".sql"] },
+      { "mediaType": "application/xml", "extensions": [".xsd", ".xml"] },
+      { "mediaType": "text/csv", "extensions": [".csv"] }
+    ],
+    "produces": [
+      { "mediaType": "application/json", "extensions": [".json"] },
+      { "mediaType": "application/x-ndjson", "extensions": [".ndjson"] },
+      { "mediaType": "text/csv", "extensions": [".csv"] },
+      { "mediaType": "application/xml", "extensions": [".xml"] },
+      { "mediaType": "application/sql", "extensions": [".sql"] }
+    ]
+  },
+  "capabilities": { "required": [], "optional": [] },
  "privacy": {
    "processing": "local",
    "fileUploads": true,
@@ -38,7 +38,7 @@ const initialDataset = generateFixtures(initialParsed.model, {
  invalidPercent: 0,
 });

-type View = "model" | "data" | "violations";
+type View = "model" | "data" | "coverage" | "violations";
 const TYPES: FixtureType[] = [
  "string",
  "integer",
@@ -334,6 +334,7 @@ export function Workbench() {
  const [rows, setRows] = useState(8);
  const [boundaryPercent, setBoundaryPercent] = useState(10);
  const [invalidPercent, setInvalidPercent] = useState(0);
+  const [providerProfile, setProviderProfile] = useState("auto");
  const [selectedTable, setSelectedTable] = useState(model.tables[0]!.name);
  const [outputFormat, setOutputFormat] = useState<OutputFormat>("json");
  const [view, setView] = useState<View>("data");
@@ -381,6 +382,7 @@ export function Workbench() {
        rows,
        boundaryPercent,
        invalidPercent,
+        providerProfile,
      });
      setModel(validated);
      setDataset(next);
@@ -584,6 +586,18 @@ export function Workbench() {
              }
            />
          </label>
+          <label>
+            Deterministic provider profile
+            <select
+              value={providerProfile}
+              onChange={(event) => setProviderProfile(event.target.value)}
+            >
+              <option value="auto">Auto by field name</option>
+              <option value="person">People</option>
+              <option value="network">Network</option>
+              <option value="commerce">Commerce</option>
+            </select>
+          </label>
          <button className="primary-button" type="button" onClick={generate}>
            Generate fixtures
          </button>
@@ -591,7 +605,7 @@ export function Workbench() {
      </section>

      <nav className="tabs" aria-label="Fixture workspaces">
-        {(["model", "data", "violations"] as View[]).map((name) => (
+        {(["model", "data", "coverage", "violations"] as View[]).map((name) => (
          <button
            type="button"
            key={name}
@@ -818,6 +832,53 @@ export function Workbench() {
          )}
        </section>
      ) : null}
+
+      {view === "coverage" ? (
+        <section className="panel">
+          <div className="panel-heading">
+            <div>
+              <h2>Constraint coverage matrix</h2>
+              <p>
+                Generation order:{" "}
+                {(dataset.generationOrder ?? []).join(" → ") || "not recorded"}.
+                Counts distinguish valid, boundary and intentionally invalid
+                evidence.
+              </p>
+            </div>
+            <span className="count-pill">
+              {dataset.coverage?.length ?? 0} rules
+            </span>
+          </div>
+          <div className="table-scroll" tabIndex={0}>
+            <table>
+              <thead>
+                <tr>
+                  <th>Table</th>
+                  <th>Constraint</th>
+                  <th>Support</th>
+                  <th>Positive</th>
+                  <th>Boundary</th>
+                  <th>Negative</th>
+                </tr>
+              </thead>
+              <tbody>
+                {(dataset.coverage ?? []).map((entry, index) => (
+                  <tr key={`${entry.table}-${entry.constraint}-${index}`}>
+                    <td>{entry.table}</td>
+                    <td>
+                      <code>{entry.constraint}</code>
+                    </td>
+                    <td>{entry.support}</td>
+                    <td>{entry.positiveCases}</td>
+                    <td>{entry.boundaryCases}</td>
+                    <td>{entry.negativeCases}</td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+        </section>
+      ) : null}
    </main>
  );
 }
@@ -34,11 +34,23 @@ export interface FixtureField {
  values?: FixtureScalar[];
  reference?: string;
  constant?: FixtureScalar;
+  /** Optional deterministic provider id; custom providers may add their own ids. */
+  provider?: string;
 }

+export type FixtureConstraint =
+  | { kind: "unique"; name?: string; fields: string[] }
+  | {
+      kind: "foreignKey";
+      name?: string;
+      fields: string[];
+      references: { table: string; fields: string[] };
+    };
+
 export interface FixtureTable {
  name: string;
  fields: FixtureField[];
+  constraints?: FixtureConstraint[];
 }

 export interface FixtureModel {
@@ -55,6 +67,7 @@ export interface GenerationOptions {
  rows: number;
  boundaryPercent: number;
  invalidPercent: number;
+  providerProfile?: string;
 }

 export interface FixtureViolation {
@@ -69,6 +82,32 @@ export interface GeneratedDataset {
  rowsPerTable: number;
  tables: Record<string, Array<Record<string, FixtureScalar>>>;
  violations: FixtureViolation[];
+  generationOrder?: string[];
+  coverage?: ConstraintCoverageRow[];
+}
+
+export interface ProviderContext {
+  table: string;
+  field: FixtureField;
+  row: number;
+  integer(minimum: number, maximum: number): number;
+  pick<T>(values: readonly T[]): T;
+}
+
+export interface FixtureProviderProfile {
+  id: string;
+  label: string;
+  supports(field: FixtureField): boolean;
+  generate(context: ProviderContext): FixtureScalar | undefined;
+}
+
+export interface ConstraintCoverageRow {
+  table: string;
+  constraint: string;
+  support: "generated" | "validated" | "generated-and-validated";
+  positiveCases: number;
+  boundaryCases: number;
+  negativeCases: number;
 }

 const MAX_SOURCE = 2 * 1024 * 1024;
@@ -229,7 +268,16 @@ export function validateModel(model: FixtureModel): FixtureModel {
        );
      if (field.constant !== undefined)
        validateConstant(field, `${table.name}.${field.name}`);
+      if (
+        field.provider !== undefined &&
+        !/^[A-Za-z][A-Za-z0-9_.-]{0,79}$/u.test(field.provider)
+      )
+        throw new TypeError(
+          `${table.name}.${field.name} has an invalid provider id.`,
+        );
    }
+    if ((table.constraints?.length ?? 0) > 100)
+      throw new RangeError(`${table.name} exceeds 100 table constraints.`);
  }
  for (const table of model.tables)
    for (const field of table.fields)
@@ -248,6 +296,47 @@ export function validateModel(model: FixtureModel): FixtureModel {
            `${table.name}.${field.name} cannot reference another foreign-key field.`,
          );
      }
+  for (const table of model.tables) {
+    const localFields = new Set(table.fields.map((field) => field.name));
+    for (const [constraintIndex, constraint] of (
+      table.constraints ?? []
+    ).entries()) {
+      const label = `${table.name} constraint ${constraint.name ?? constraintIndex + 1}`;
+      if (constraint.kind !== "unique" && constraint.kind !== "foreignKey")
+        throw new TypeError(`${label} has an unsupported kind.`);
+      if (
+        !Array.isArray(constraint.fields) ||
+        constraint.fields.length < 1 ||
+        constraint.fields.length > 16 ||
+        new Set(constraint.fields).size !== constraint.fields.length ||
+        constraint.fields.some((field) => !localFields.has(field))
+      )
+        throw new TypeError(
+          `${label} needs 1–16 distinct existing local fields.`,
+        );
+      if (constraint.name !== undefined && !NAME_PATTERN.test(constraint.name))
+        throw new TypeError(`${label} has an invalid name.`);
+      if (constraint.kind === "foreignKey") {
+        const target = model.tables.find(
+          (candidate) => candidate.name === constraint.references?.table,
+        );
+        const referenced = constraint.references?.fields;
+        if (
+          !target ||
+          !Array.isArray(referenced) ||
+          referenced.length !== constraint.fields.length ||
+          new Set(referenced).size !== referenced.length ||
+          referenced.some(
+            (field) =>
+              !target.fields.some((candidate) => candidate.name === field),
+          )
+        )
+          throw new TypeError(
+            `${label} has invalid composite reference columns.`,
+          );
+      }
+    }
+  }
  return model;
 }

@@ -327,6 +416,8 @@ function fromJsonSchema(source: string): ParsedModel {
      distribution === "constant"
    )
      field.distribution = distribution;
+    if (typeof property["x-fixture-provider"] === "string")
+      field.provider = property["x-fixture-provider"];
    if (property.pattern !== undefined)
      notices.push(
        `${rawName}: regular-expression generation is not inferred; edit the field model if needed.`,
@@ -367,9 +458,7 @@ function fromFixtureModel(source: string): ParsedModel {
      !Array.isArray(table.fields)
    )
      throw new TypeError(`Fixture table ${tableIndex + 1} is invalid.`);
-    return {
-      name: table.name,
-      fields: table.fields.map((rawField, fieldIndex) => {
+    const fields = table.fields.map((rawField, fieldIndex) => {
      const field = object(rawField);
      if (
        !field ||
@@ -433,8 +522,59 @@ function fromFixtureModel(source: string): ParsedModel {
          ? { reference: field.reference }
          : {}),
        ...(isScalar(field.constant) ? { constant: field.constant } : {}),
+        ...(typeof field.provider === "string"
+          ? { provider: field.provider }
+          : {}),
      };
-      }),
+    });
+    const constraints = Array.isArray(table.constraints)
+      ? table.constraints.map((rawConstraint, index): FixtureConstraint => {
+          const constraint = object(rawConstraint);
+          if (
+            !constraint ||
+            (constraint.kind !== "unique" &&
+              constraint.kind !== "foreignKey") ||
+            !Array.isArray(constraint.fields) ||
+            !constraint.fields.every((field) => typeof field === "string")
+          )
+            throw new TypeError(
+              `Fixture constraint ${table.name}.${index + 1} is invalid.`,
+            );
+          if (constraint.kind === "unique")
+            return {
+              kind: "unique",
+              fields: constraint.fields as string[],
+              ...(typeof constraint.name === "string"
+                ? { name: constraint.name }
+                : {}),
+            };
+          const reference = object(constraint.references);
+          if (
+            !reference ||
+            typeof reference.table !== "string" ||
+            !Array.isArray(reference.fields) ||
+            !reference.fields.every((field) => typeof field === "string")
+          )
+            throw new TypeError(
+              `Fixture composite reference ${table.name}.${index + 1} is invalid.`,
+            );
+          return {
+            kind: "foreignKey",
+            fields: constraint.fields as string[],
+            ...(typeof constraint.name === "string"
+              ? { name: constraint.name }
+              : {}),
+            references: {
+              table: reference.table,
+              fields: reference.fields as string[],
+            },
+          };
+        })
+      : [];
+    return {
+      name: table.name,
+      fields,
+      ...(constraints.length ? { constraints } : {}),
    };
  });
  return { model: validateModel({ tables }), notices: [] };
@@ -558,6 +698,21 @@ function sqlType(source: string): FixtureType {
  return "string";
 }

+function sqlIdentifierList(source: string): string[] {
+  return splitSqlList(source).map((value, index) => {
+    const match =
+      /^(?:"([^"]+)"|`([^`]+)`|\[([^\]]+)\]|([A-Za-z_][A-Za-z0-9_$-]*))$/u.exec(
+        value.trim(),
+      );
+    if (!match)
+      throw new SyntaxError(`Unsupported SQL constraint column ${index + 1}.`);
+    return importedName(
+      match[1] ?? match[2] ?? match[3] ?? match[4] ?? `field_${index + 1}`,
+      `field_${index + 1}`,
+    );
+  });
+}
+
 function fromSql(source: string): ParsedModel {
  const text = assertSource(source, "SQL DDL")
    .replace(/--[^\n]*/gu, "")
@@ -590,10 +745,61 @@ function fromSql(source: string): ParsedModel {
    expression.lastIndex = cursor;
    const used = new Set<string>();
    const fields: FixtureField[] = [];
+    const constraints: FixtureConstraint[] = [];
    for (const definition of splitSqlList(body)) {
+      const named =
+        /^CONSTRAINT\s+(?:"([^"]+)"|`([^`]+)`|\[([^\]]+)\]|([A-Za-z_][A-Za-z0-9_$-]*))\s+([\s\S]+)$/iu.exec(
+          definition,
+        );
+      const constraintName = named
+        ? importedName(
+            named[1] ?? named[2] ?? named[3] ?? named[4] ?? "constraint",
+            "constraint",
+          )
+        : undefined;
+      const constraintSource = named?.[5] ?? definition;
+      const unique = /^(PRIMARY\s+KEY|UNIQUE)\s*\(([^)]+)\)/iu.exec(
+        constraintSource,
+      );
+      if (unique) {
+        const constraintFields = sqlIdentifierList(unique[2]!);
+        constraints.push({
+          kind: "unique",
+          ...(constraintName ? { name: constraintName } : {}),
+          fields: constraintFields,
+        });
+        if (/^PRIMARY/iu.test(unique[1]!))
+          fields.forEach((field) => {
+            if (constraintFields.includes(field.name)) field.required = true;
+          });
+        continue;
+      }
+      const compositeReference =
+        /^FOREIGN\s+KEY\s*\(([^)]+)\)\s+REFERENCES\s+(?:"([^"]+)"|`([^`]+)`|\[([^\]]+)\]|([A-Za-z_][A-Za-z0-9_$-]*))\s*\(([^)]+)\)/iu.exec(
+          constraintSource,
+        );
+      if (compositeReference) {
+        constraints.push({
+          kind: "foreignKey",
+          ...(constraintName ? { name: constraintName } : {}),
+          fields: sqlIdentifierList(compositeReference[1]!),
+          references: {
+            table: importedName(
+              compositeReference[2] ??
+                compositeReference[3] ??
+                compositeReference[4] ??
+                compositeReference[5] ??
+                "table",
+              "table",
+            ),
+            fields: sqlIdentifierList(compositeReference[6]!),
+          },
+        });
+        continue;
+      }
      if (/^(?:CONSTRAINT|PRIMARY|UNIQUE|FOREIGN|CHECK)\b/iu.test(definition)) {
        notices.push(
-          `${rawName}: table-level constraint retained as a review notice, not inferred.`,
+          `${rawName}: unsupported table-level constraint retained as a review notice.`,
        );
        continue;
      }
@@ -644,6 +850,7 @@ function fromSql(source: string): ParsedModel {
    tables.push({
      name: importedName(rawName, `table_${tables.length + 1}`),
      fields,
+      ...(constraints.length ? { constraints } : {}),
    });
  }
  if (!tables.length)
@@ -770,7 +977,7 @@ function fromXsd(source: string): ParsedModel {
  });
  const root = elements.find((element) => !fieldElements.includes(element));
  const notices = [
-    "XSD v0.1 imports named sequence/all elements and basic built-in scalar types; facets, choices, keys and external schemas require review.",
+    "XSD v0.2 imports named sequence/all elements and basic built-in scalar types; facets, choices, keys and external schemas require review.",
  ];
  return {
    model: validateModel({
@@ -821,6 +1028,163 @@ class SeededRandom {
  }
 }

+const FIRST_NAMES = ["Ada", "Grace", "Linus", "Katherine", "Alan", "Edsger"];
+const LAST_NAMES = [
+  "Lovelace",
+  "Hopper",
+  "Torvalds",
+  "Johnson",
+  "Turing",
+  "Dijkstra",
+];
+const PRODUCTS = ["Atlas", "Beacon", "Compass", "Delta", "Ember", "Foundry"];
+
+export const BUILTIN_PROVIDER_PROFILES: readonly FixtureProviderProfile[] = [
+  {
+    id: "person",
+    label: "People",
+    supports: (field) =>
+      field.type === "string" &&
+      /(?:first|last|display|full)_?name|company/iu.test(field.name),
+    generate({ field, row, pick }) {
+      if (/first/iu.test(field.name)) return pick(FIRST_NAMES);
+      if (/last/iu.test(field.name)) return pick(LAST_NAMES);
+      if (/company/iu.test(field.name)) return `${pick(LAST_NAMES)} Labs`;
+      return `${FIRST_NAMES[row % FIRST_NAMES.length]} ${pick(LAST_NAMES)}`;
+    },
+  },
+  {
+    id: "network",
+    label: "Network",
+    supports: (field) =>
+      field.type === "string" &&
+      /(?:ip|ipv4|host|domain|url)/iu.test(field.name),
+    generate({ field, row, integer }) {
+      if (/url/iu.test(field.name))
+        return `https://host-${row + 1}.example.test/path`;
+      if (/host|domain/iu.test(field.name))
+        return `host-${row + 1}.example.test`;
+      return `192.0.2.${integer(1, 254)}`;
+    },
+  },
+  {
+    id: "commerce",
+    label: "Commerce",
+    supports: (field) =>
+      field.type === "string" && /(?:sku|product|currency)/iu.test(field.name),
+    generate({ field, row, pick }) {
+      if (/currency/iu.test(field.name)) return pick(["EUR", "USD", "GBP"]);
+      if (/sku/iu.test(field.name))
+        return `SKU-${String(row + 1).padStart(6, "0")}`;
+      return `${pick(PRODUCTS)} ${row + 1}`;
+    },
+  },
+];
+
+/** Returns a stable target-before-dependent table order or rejects cycles. */
+export function topologicalTableOrder(input: FixtureModel): string[] {
+  const model = validateModel(structuredClone(input));
+  const dependencies = new Map<string, Set<string>>(
+    model.tables.map((table) => [table.name, new Set<string>()]),
+  );
+  for (const table of model.tables) {
+    for (const field of table.fields) {
+      const target = field.reference?.split(".")[0];
+      if (target && target !== table.name)
+        dependencies.get(table.name)!.add(target);
+    }
+    for (const constraint of table.constraints ?? [])
+      if (
+        constraint.kind === "foreignKey" &&
+        constraint.references.table !== table.name
+      )
+        dependencies.get(table.name)!.add(constraint.references.table);
+  }
+  const result: string[] = [];
+  const pending = new Set(model.tables.map((table) => table.name));
+  while (pending.size) {
+    const next = model.tables.find(
+      (table) =>
+        pending.has(table.name) &&
+        [...dependencies.get(table.name)!].every((dependency) =>
+          result.includes(dependency),
+        ),
+    );
+    if (!next)
+      throw new TypeError(
+        `Cyclic table reference dependency: ${[...pending].join(" → ")}.`,
+      );
+    result.push(next.name);
+    pending.delete(next.name);
+  }
+  return result;
+}
+
+function activeProviders(
+  profile: string | undefined,
+  providers: readonly FixtureProviderProfile[],
+): readonly FixtureProviderProfile[] {
+  const ids = new Set<string>();
+  for (const provider of providers) {
+    if (
+      !/^[A-Za-z][A-Za-z0-9_.-]{0,79}$/u.test(provider.id) ||
+      ids.has(provider.id)
+    )
+      throw new TypeError(
+        `Invalid or duplicate fixture provider id ${provider.id}.`,
+      );
+    ids.add(provider.id);
+  }
+  if (!profile || profile === "auto") return providers;
+  const selected = providers.find((provider) => provider.id === profile);
+  if (!selected)
+    throw new TypeError(`Unknown fixture provider profile ${profile}.`);
+  return [selected];
+}
+
+function providerValue(
+  table: string,
+  field: FixtureField,
+  row: number,
+  random: SeededRandom,
+  providers: readonly FixtureProviderProfile[],
+): FixtureScalar | undefined {
+  const eligible = field.provider
+    ? providers.filter((provider) => provider.id === field.provider)
+    : providers.filter((provider) => provider.supports(field));
+  if (field.provider && eligible.length === 0)
+    throw new TypeError(
+      `No provider ${field.provider} is available for ${table}.${field.name}.`,
+    );
+  const provider = eligible[0];
+  if (!provider) return undefined;
+  const value = provider.generate({
+    table,
+    field,
+    row,
+    integer: (minimum, maximum) => random.integer(minimum, maximum),
+    pick: <T>(values: readonly T[]) => {
+      if (!values.length)
+        throw new TypeError(
+          `Provider ${provider.id} offered an empty value set.`,
+        );
+      return values[random.integer(0, values.length - 1)]!;
+    },
+  });
+  if (value === undefined) return undefined;
+  if (!constantMatchesType(value, field.type))
+    throw new TypeError(
+      `Provider ${provider.id} returned the wrong type for ${table}.${field.name}.`,
+    );
+  if (
+    typeof value === "string" &&
+    ((field.minLength !== undefined && value.length < field.minLength) ||
+      (field.maxLength !== undefined && value.length > field.maxLength))
+  )
+    return undefined;
+  return value;
+}
+
 function boundedNumber(field: FixtureField, random: SeededRandom): number {
  const minimum = field.minimum ?? 0;
  const maximum = field.maximum ?? (field.type === "integer" ? 1_000 : 100);
@@ -860,13 +1224,17 @@ function uuid(random: SeededRandom): string {
 }

 function validValue(
+  table: string,
  field: FixtureField,
  row: number,
  random: SeededRandom,
  boundary: boolean,
+  providers: readonly FixtureProviderProfile[],
 ): FixtureScalar {
  if (field.distribution === "constant" && field.constant !== undefined)
    return field.constant;
+  const provided = providerValue(table, field, row, random, providers);
+  if (provided !== undefined) return provided;
  if (field.type === "boolean")
    return field.distribution === "sequential"
      ? row % 2 === 0
@@ -957,6 +1325,7 @@ function invalidValue(
 export function generateFixtures(
  input: FixtureModel,
  options: GenerationOptions,
+  customProviders: readonly FixtureProviderProfile[] = [],
 ): GeneratedDataset {
  const model = validateModel(structuredClone(input));
  if (!options.seed || options.seed.length > 256)
@@ -983,10 +1352,18 @@ export function generateFixtures(
    if (!Number.isFinite(value) || value < 0 || value > 100)
      throw new RangeError("Boundary and invalid percentages must be 0–100.");
  const random = new SeededRandom(options.seed);
+  const providers = activeProviders(options.providerProfile, [
+    ...customProviders,
+    ...BUILTIN_PROVIDER_PROFILES,
+  ]);
+  const generationOrder = topologicalTableOrder(model);
  const tables: GeneratedDataset["tables"] = Object.create(
    null,
  ) as GeneratedDataset["tables"];
-  for (const table of model.tables) {
+  for (const tableName of generationOrder) {
+    const table = model.tables.find(
+      (candidate) => candidate.name === tableName,
+    )!;
    const seen = new Map<string, Set<string>>();
    tables[table.name] = Array.from(
      { length: options.rows },
@@ -1004,10 +1381,12 @@ export function generateFixtures(
          const values = seen.get(field.name) ?? new Set<string>();
          do {
            value = validValue(
+              table.name,
              field,
              row + attempts * options.rows,
              random,
              !field.unique && random.next() * 100 < options.boundaryPercent,
+              providers,
            );
            attempts += 1;
          } while (
@@ -1058,6 +1437,58 @@ export function generateFixtures(
        record[field.name] = targets[row % targets.length]!;
      });
    }
+  for (const table of model.tables)
+    for (const constraint of (table.constraints ?? []).filter(
+      (item): item is Extract<FixtureConstraint, { kind: "foreignKey" }> =>
+        item.kind === "foreignKey",
+    )) {
+      const targets = tables[constraint.references.table]!;
+      tables[table.name]!.forEach((record, row) => {
+        const target = targets[row % targets.length]!;
+        constraint.fields.forEach((field, index) => {
+          record[field] = target[constraint.references.fields[index]!]!;
+        });
+      });
+    }
+
+  for (const table of model.tables)
+    for (const constraint of (table.constraints ?? []).filter(
+      (item): item is Extract<FixtureConstraint, { kind: "unique" }> =>
+        item.kind === "unique",
+    )) {
+      const seen = new Set<string>();
+      for (const [row, record] of tables[table.name]!.entries()) {
+        let key = tupleKey(record, constraint.fields);
+        let attempt = 0;
+        while (seen.has(key) && attempt < 200) {
+          const fieldName = [...constraint.fields]
+            .reverse()
+            .find(
+              (name) =>
+                table.fields.find((field) => field.name === name)?.type !==
+                "foreignKey",
+            );
+          const field = table.fields.find(
+            (candidate) => candidate.name === fieldName,
+          );
+          if (!field) break;
+          record[field.name] = validValue(
+            table.name,
+            field,
+            row + (++attempt + 1) * options.rows,
+            random,
+            false,
+            providers,
+          );
+          key = tupleKey(record, constraint.fields);
+        }
+        if (seen.has(key))
+          throw new RangeError(
+            `Could not satisfy composite uniqueness for ${table.name}(${constraint.fields.join(", ")}).`,
+          );
+        seen.add(key);
+      }
+    }
  for (const table of model.tables)
    tables[table.name]!.forEach((record, row) => {
      for (const field of table.fields.filter(
@@ -1076,18 +1507,121 @@ export function generateFixtures(
        });
      }
    });
-  return {
+  for (const table of model.tables)
+    for (const constraint of table.constraints ?? [])
+      tables[table.name]!.forEach((record, row) => {
+        if (row === 0 || random.next() * 100 >= options.invalidPercent) return;
+        if (constraint.kind === "unique") {
+          const source = tables[table.name]![0]!;
+          constraint.fields.forEach((field) => {
+            record[field] = source[field]!;
+          });
+        } else record[constraint.fields[0]!] = "__missing_reference__";
+        violations.push({
+          table: table.name,
+          row: row + 1,
+          field: constraint.fields.join(","),
+          rule: constraintLabel(constraint),
+        });
+      });
+  const dataset: GeneratedDataset = {
    seed: options.seed,
    rowsPerTable: options.rows,
    tables,
    violations: violations.slice(0, 100_000),
+    generationOrder,
  };
+  dataset.coverage = constraintCoverageMatrix(model, dataset);
+  return dataset;
 }

 function stableKey(value: FixtureScalar): string {
  return `${typeof value}:${String(value)}`;
 }

+function tupleKey(
+  record: Record<string, FixtureScalar>,
+  fields: readonly string[],
+): string {
+  return fields.map((field) => stableKey(record[field] ?? null)).join("\u0000");
+}
+
+function constraintLabel(constraint: FixtureConstraint): string {
+  return constraint.kind === "unique"
+    ? `unique(${constraint.fields.join(",")})`
+    : `foreignKey(${constraint.fields.join(",")})->${constraint.references.table}(${constraint.references.fields.join(",")})`;
+}
+
+/** Auditable positive, boundary and intentional-negative coverage per rule. */
+export function constraintCoverageMatrix(
+  input: FixtureModel,
+  dataset?: GeneratedDataset,
+): ConstraintCoverageRow[] {
+  const model = validateModel(structuredClone(input));
+  const result: ConstraintCoverageRow[] = [];
+  const add = (
+    table: FixtureTable,
+    constraint: string,
+    boundary: (record: Record<string, FixtureScalar>) => boolean = () => false,
+    support: ConstraintCoverageRow["support"] = "generated-and-validated",
+  ) => {
+    const rows = dataset?.tables[table.name] ?? [];
+    const negativeCases =
+      dataset?.violations.filter(
+        (violation) =>
+          violation.table === table.name &&
+          (violation.rule === constraint ||
+            (constraint.startsWith("type:") && violation.rule === constraint)),
+      ).length ?? 0;
+    result.push({
+      table: table.name,
+      constraint,
+      support,
+      positiveCases: Math.max(0, rows.length - negativeCases),
+      boundaryCases: rows.filter(boundary).length,
+      negativeCases,
+    });
+  };
+  for (const table of model.tables) {
+    for (const field of table.fields) {
+      const value = (record: Record<string, FixtureScalar>) =>
+        record[field.name];
+      add(table, `type:${field.type}`);
+      if (field.required) add(table, "required");
+      if (field.unique) add(table, "unique");
+      if (field.minimum !== undefined)
+        add(table, "minimum", (record) => value(record) === field.minimum);
+      if (field.maximum !== undefined)
+        add(table, "maximum", (record) => value(record) === field.maximum);
+      if (field.minLength !== undefined)
+        add(
+          table,
+          "minLength",
+          (record) =>
+            typeof value(record) === "string" &&
+            String(value(record)).length === field.minLength,
+        );
+      if (field.maxLength !== undefined)
+        add(
+          table,
+          "maxLength",
+          (record) =>
+            typeof value(record) === "string" &&
+            String(value(record)).length === field.maxLength,
+        );
+      if (field.type === "enum") add(table, "enum");
+      if (field.type === "email" || field.type === "uuid")
+        add(table, `format:${field.type}`);
+      if (field.type === "foreignKey") add(table, "foreignKey");
+      if (field.provider)
+        add(table, `provider:${field.provider}`, () => false, "generated");
+    }
+    for (const constraint of table.constraints ?? [])
+      add(table, constraintLabel(constraint));
+  }
+  return result;
+}
+
 function safeCsvValue(value: FixtureScalar): FixtureScalar {
  return typeof value === "string" && /^[\t\r\n ]*[=+\-@]/u.test(value)
    ? `'${value}`
@@ -3,7 +3,7 @@
  "schemaVersion": 1,
  "id": "de.add-ideas.fixture-tools",
  "name": "Fixture Tools",
-  "version": "0.1.0",
+  "version": "0.2.0",
  "description": "Generate deterministic synthetic test data locally.",
  "entry": "./",
  "icon": "./favicon.svg",
@@ -21,6 +21,52 @@
    "crossOriginIsolated": false,
    "topLevelContext": false
  },
+  "io": {
+    "accepts": [
+      {
+        "mediaType": "application/schema+json",
+        "extensions": [".json"]
+      },
+      {
+        "mediaType": "application/sql",
+        "extensions": [".sql"]
+      },
+      {
+        "mediaType": "application/xml",
+        "extensions": [".xsd", ".xml"]
+      },
+      {
+        "mediaType": "text/csv",
+        "extensions": [".csv"]
+      }
+    ],
+    "produces": [
+      {
+        "mediaType": "application/json",
+        "extensions": [".json"]
+      },
+      {
+        "mediaType": "application/x-ndjson",
+        "extensions": [".ndjson"]
+      },
+      {
+        "mediaType": "text/csv",
+        "extensions": [".csv"]
+      },
+      {
+        "mediaType": "application/xml",
+        "extensions": [".xml"]
+      },
+      {
+        "mediaType": "application/sql",
+        "extensions": [".sql"]
+      }
+    ]
+  },
+  "capabilities": {
+    "required": [],
+    "optional": []
+  },
  "privacy": {
    "processing": "local",
    "fileUploads": true,
@@ -1 +1 @@
-export const APP_VERSION = "0.1.0";
+export const APP_VERSION = "0.2.0";
@@ -54,6 +54,27 @@ test("imports CSV headings and exports an inspectable model", async ({
  expect((await pending).suggestedFilename()).toBe("fixture-model.json");
 });

+test("imports composite constraints and exposes topological coverage", async ({
+  page,
+}) => {
+  await page.goto("/deep/nested/fixture/");
+  await page.getByLabel("Fixture model source").fill(`CREATE TABLE tenants (
+    region VARCHAR(8), tenant_id INTEGER, PRIMARY KEY (region, tenant_id)
+  );
+  CREATE TABLE events (
+    region VARCHAR(8), tenant_id INTEGER,
+    FOREIGN KEY (region, tenant_id) REFERENCES tenants(region, tenant_id)
+  );`);
+  await page.getByRole("button", { name: "Import model" }).click();
+  await page.getByRole("button", { name: "Generate fixtures" }).click();
+  await page.getByRole("button", { name: "Coverage" }).click();
+  await expect(
+    page.getByRole("heading", { name: "Constraint coverage matrix" }),
+  ).toBeVisible();
+  await expect(page.getByText("tenants → events")).toBeVisible();
+  await expect(page.getByText(/foreignKey\(region,tenant_id\)/u)).toBeVisible();
+});
+
 test("retains results after a failed import and downloads output", async ({
  page,
 }) => {
@@ -97,7 +118,7 @@ test("integrates help, themes, PWA identity and hardened headers", async ({
  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",
+    version: "0.2.0",
    privacy: { processing: "local", telemetry: false },
  });
 });
@@ -0,0 +1,18 @@
+import { expect, test } from "@playwright/test";
+
+test("keeps the primary workspace inside a narrow viewport", async ({
+  page,
+}) => {
+  await page.goto("/deep/nested/fixture/");
+  await expect(page.locator("main").first()).toBeVisible();
+  await expect(
+    page.locator("main .loading, main .workbench-loading"),
+  ).toHaveCount(0);
+
+  const widths = await page.evaluate(() => ({
+    content: document.documentElement.scrollWidth,
+    viewport: document.documentElement.clientWidth,
+  }));
+  expect(widths.viewport).toBeLessThanOrEqual(430);
+  expect(widths.content).toBeLessThanOrEqual(widths.viewport + 1);
+});
@@ -1,9 +1,11 @@
 import { describe, expect, it } from "vitest";
 import {
  generateFixtures,
+  constraintCoverageMatrix,
  modelJson,
  parseFixtureModel,
  serializeDataset,
+  topologicalTableOrder,
  type GeneratedDataset,
 } from "../../src/fixture/model";

@@ -175,4 +177,104 @@ describe("fixture model", () => {
      }),
    ).toThrow(/100,000 field values/u);
  });
+
+  it("imports and generates composite relational constraints topologically", () => {
+    const sql = `CREATE TABLE tenants (
+      region VARCHAR(8) NOT NULL,
+      tenant_id INTEGER NOT NULL,
+      PRIMARY KEY (region, tenant_id)
+    );
+    CREATE TABLE events (
+      region VARCHAR(8) NOT NULL,
+      tenant_id INTEGER NOT NULL,
+      sequence INTEGER NOT NULL,
+      UNIQUE (region, tenant_id, sequence),
+      FOREIGN KEY (region, tenant_id) REFERENCES tenants(region, tenant_id)
+    );`;
+    const model = parseFixtureModel(sql, "sql").model;
+    expect(model.tables[1]?.constraints).toEqual([
+      { kind: "unique", fields: ["region", "tenant_id", "sequence"] },
+      {
+        kind: "foreignKey",
+        fields: ["region", "tenant_id"],
+        references: { table: "tenants", fields: ["region", "tenant_id"] },
+      },
+    ]);
+    expect(topologicalTableOrder(model)).toEqual(["tenants", "events"]);
+    const dataset = generateFixtures(model, {
+      seed: "composite",
+      rows: 12,
+      boundaryPercent: 10,
+      invalidPercent: 0,
+      providerProfile: "auto",
+    });
+    const targets = new Set(
+      dataset.tables.tenants?.map((row) => `${row.region}:${row.tenant_id}`),
+    );
+    expect(
+      dataset.tables.events?.every((row) =>
+        targets.has(`${row.region}:${row.tenant_id}`),
+      ),
+    ).toBe(true);
+    expect(dataset.generationOrder).toEqual(["tenants", "events"]);
+    expect(
+      constraintCoverageMatrix(model, dataset).some(
+        (entry) =>
+          entry.table === "events" &&
+          entry.constraint.startsWith("foreignKey(region,tenant_id)"),
+      ),
+    ).toBe(true);
+  });
+
+  it("accepts scalar table-level primary and foreign-key constraints", () => {
+    const sql = `CREATE TABLE accounts (
+      account_id INTEGER NOT NULL,
+      PRIMARY KEY (account_id)
+    );
+    CREATE TABLE entries (
+      account_id INTEGER NOT NULL,
+      FOREIGN KEY (account_id) REFERENCES accounts(account_id)
+    );`;
+    const model = parseFixtureModel(sql, "sql").model;
+    expect(model.tables[0]?.constraints).toEqual([
+      { kind: "unique", fields: ["account_id"] },
+    ]);
+    expect(model.tables[1]?.constraints).toEqual([
+      {
+        kind: "foreignKey",
+        fields: ["account_id"],
+        references: { table: "accounts", fields: ["account_id"] },
+      },
+    ]);
+    const dataset = generateFixtures(model, {
+      seed: "scalar-table-constraints",
+      rows: 8,
+      boundaryPercent: 0,
+      invalidPercent: 0,
+    });
+    const accounts = new Set(
+      dataset.tables.accounts?.map((row) => row.account_id),
+    );
+    expect(
+      dataset.tables.entries?.every((row) => accounts.has(row.account_id)),
+    ).toBe(true);
+  });
+
+  it("supports deterministic built-in and custom provider profiles", () => {
+    const model = parseFixtureModel("display_name,host,sku\n", "csv").model;
+    const options = {
+      seed: "providers",
+      rows: 4,
+      boundaryPercent: 0,
+      invalidPercent: 0,
+      providerProfile: "auto",
+    };
+    const generated = generateFixtures(model, options);
+    expect(generated).toEqual(generateFixtures(model, options));
+    expect(generated.tables.records?.[0]).toMatchObject({
+      display_name: expect.stringMatching(/ /u),
+      host: expect.stringMatching(/\.example\.test$/u),
+      sku: "SKU-000001",
+    });
+  });
 });