feat(db): add SQLite schema, FTS5, migration runner

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/integration/db.test.ts

@@ -0,0 +1,83 @@
+import { describe, it, expect } from 'vitest';
+import { openInMemoryForTest } from '../../src/lib/server/db';
+import { runMigrations } from '../../src/lib/server/db/migrate';
+
+describe('db migrations', () => {
+  it('creates all expected tables', () => {
+    const db = openInMemoryForTest();
+    const tables = (
+      db.prepare("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name").all() as {
+        name: string;
+      }[]
+    ).map((r) => r.name);
+    for (const t of [
+      'profile',
+      'recipe',
+      'ingredient',
+      'step',
+      'tag',
+      'recipe_tag',
+      'rating',
+      'comment',
+      'favorite',
+      'cooking_log',
+      'allowed_domain',
+      'schema_migration'
+    ]) {
+      expect(tables).toContain(t);
+    }
+  });
+
+  it('is idempotent', () => {
+    const db = openInMemoryForTest();
+    runMigrations(db);
+    const migs = db.prepare('SELECT COUNT(*) AS c FROM schema_migration').get() as { c: number };
+    expect(migs.c).toBe(1);
+  });
+
+  it('cascades recipe delete to ingredients and steps', () => {
+    const db = openInMemoryForTest();
+    const row = db
+      .prepare('INSERT INTO recipe(title) VALUES (?) RETURNING id')
+      .get('Test') as { id: number };
+    db.prepare('INSERT INTO ingredient(recipe_id, position, name) VALUES (?, ?, ?)').run(
+      row.id,
+      1,
+      'Salz'
+    );
+    db.prepare('INSERT INTO step(recipe_id, position, text) VALUES (?, ?, ?)').run(
+      row.id,
+      1,
+      'Kochen'
+    );
+    db.prepare('DELETE FROM recipe WHERE id = ?').run(row.id);
+    const ings = db.prepare('SELECT COUNT(*) AS c FROM ingredient').get() as { c: number };
+    const steps = db.prepare('SELECT COUNT(*) AS c FROM step').get() as { c: number };
+    expect(ings.c).toBe(0);
+    expect(steps.c).toBe(0);
+  });
+
+  it('FTS5 index finds recipes by title', () => {
+    const db = openInMemoryForTest();
+    db.prepare('INSERT INTO recipe(title, description) VALUES (?, ?)').run(
+      'Spaghetti Carbonara',
+      'Italienisches Pasta-Klassiker'
+    );
+    const hits = db
+      .prepare("SELECT rowid FROM recipe_fts WHERE recipe_fts MATCH 'carbonara'")
+      .all();
+    expect(hits.length).toBe(1);
+  });
+
+  it('enforces rating stars 1..5', () => {
+    const db = openInMemoryForTest();
+    db.prepare('INSERT INTO profile(name) VALUES (?)').run('Hendrik');
+    const r = db
+      .prepare('INSERT INTO recipe(title) VALUES (?) RETURNING id')
+      .get('Test') as { id: number };
+    db.prepare('INSERT INTO rating(recipe_id, profile_id, stars) VALUES (?, 1, 5)').run(r.id);
+    expect(() =>
+      db.prepare('INSERT INTO rating(recipe_id, profile_id, stars) VALUES (?, 1, 6)').run(r.id)
+    ).toThrow();
+  });
+});