fix(reference): preserve station evidence and rollback schema

tests/reference.test.ts

@@ -24,9 +24,9 @@ describe('fixture reference compiler', () => {
       const resultVersion = result.version;
       const repository = new SqliteReferenceRepository(join(root, 'reference'));
       expect(await repository.types([34, 35, 587, 999999])).toEqual([
-        { id: 34, name: 'Tritanium', categoryId: 4, volume: 0.01 },
-        { id: 35, name: 'Pyerite', categoryId: 4, volume: 0.01 },
-        { id: 587, name: 'Rifter', categoryId: 6, volume: 2500 },
+        expect.objectContaining({ id: 34, name: 'Tritanium', categoryId: 4, groupId: 18, volume: 0.01 }),
+        expect.objectContaining({ id: 35, name: 'Pyerite', categoryId: 4, groupId: 18, volume: 0.01 }),
+        expect.objectContaining({ id: 587, name: 'Rifter', categoryId: 6, groupId: 25, volume: 2500 }),
       ]);
       expect(await repository.version()).toBe(resultVersion);
       repository.close();
@@ -299,6 +299,28 @@ describe('fixture reference compiler', () => {
     } finally { await rm(root, { recursive: true, force: true }); }
   });
 
+  test('rejects a malformed PREVIOUS artifact before rollback', async () => {
+    const { root, sources } = await fixtureDirectory();
+    const directory = join(root, 'reference');
+    try {
+      const first = await new ReferenceCompiler({ directory, profile: 'fixture', sources: fixtureSources(sources) }).compile();
+      expect(first.status).toBe('success');
+      if (first.status !== 'success' || !first.version) throw new Error('initial fixture build did not publish a version');
+      await writeFile(join(sources, 'reference-data.json'), `${await readFile(join(sources, 'reference-data.json'), 'utf8')}\n`);
+      const second = await new ReferenceCompiler({ directory, profile: 'fixture', sources: fixtureSources(sources) }).compile();
+      expect(second.status).toBe('success');
+      if (second.status !== 'success' || !second.version) throw new Error('second fixture build did not publish a version');
+      const manifest = await readReferenceManifest(directory);
+      if (!manifest.previous) throw new Error('fixture build did not retain PREVIOUS');
+      const previousPath = join(directory, 'databases', `${manifest.previous.version}.sqlite`);
+      const malformed = new Database(previousPath);
+      malformed.run('DROP INDEX type_search_normalized_name_idx');
+      malformed.close();
+      await expect(new ReferenceCompiler({ directory, profile: 'fixture', sources: fixtureSources(sources) }).rollback()).rejects.toThrow(/incompatible schema version/);
+      expect((await readReferenceManifest(directory)).active?.version).toBe(second.version);
+    } finally { await rm(root, { recursive: true, force: true }); }
+  });
+
   test('recovers a validated orphan database after manifest publication crash', async () => {
     const { root, sources } = await fixtureDirectory();
     const directory = join(root, 'reference');