Persist comment source monitoring

tests/comment-source-watch.test.ts

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+import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+import Database from 'better-sqlite3';
+import { runMigrations } from '../src/database/client.js';
+import { CommentSourceWatchRepository } from '../src/database/comment-source-watch-repository.js';
+import type { BrowsingThing, RedditPost } from '../src/reddit/api.js';
+
+function post(id: string, createdAtMs: number): RedditPost {
+  return {
+    id, name: id, subreddit: 'scene', author: `author-${id}`, title: id,
+    url: `https://example.test/${id}.jpg`, permalink: `/r/scene/comments/${id}/`, thumbnail: '',
+    is_self: false, created_utc: createdAtMs / 1_000, over_18: true, spoiler: false,
+  };
+}
+
+function comment(text: string): BrowsingThing {
+  return {
+    fullname: 't1_comment', kind: 'comment', subreddit: 'scene', author: 'reader',
+    permalink: '/r/scene/comments/source/post/comment/', createdAt: 2_000, score: 1,
+    text, nsfw: true, parentPostId: 'source', distinguished: null, removed: false,
+  };
+}
+
+describe('CommentSourceWatchRepository', () => {
+  let db: Database.Database;
+  let repo: CommentSourceWatchRepository;
+
+  beforeEach(() => {
+    db = new Database(':memory:');
+    runMigrations(db);
+    repo = new CommentSourceWatchRepository(db);
+  });
+
+  afterEach(() => db.close());
+
+  it('durably rotates source posts until their configured watch window expires', () => {
+    expect(repo.refreshSources([post('older', 1_000), post('newer', 2_000)], 10_000, 3_000))
+      .toEqual({ added: 2, active: 2, expired: 0 });
+    expect(repo.nextSource('SCENE', 3_000)?.id).toBe('newer');
+
+    repo.markChecked('newer', 3_100);
+    expect(repo.nextSource('scene', 3_200)?.id).toBe('older');
+
+    const restored = new CommentSourceWatchRepository(db);
+    expect(restored.nextSource('scene', 3_200)?.id).toBe('older');
+    expect(restored.refreshSources([], 10_000, 12_001)).toEqual({ added: 0, active: 0, expired: 2 });
+  });
+
+  it('reuses unchanged verdicts across restarts and reclassifies edited bodies', () => {
+    const original = comment('I would love that done to me');
+    const verdict = {
+      id: original.fullname, qualifies: true, expressedGender: 'female' as const,
+      confidence: 0.94, evidence: 'recipient role',
+    };
+    repo.recordVerdict(original, verdict, 4_000);
+
+    expect(new CommentSourceWatchRepository(db).getVerdict(original)).toEqual({ ...verdict, evidence: '' });
+    const stored = db.prepare(`
+      SELECT body_sha256, verdict_json FROM comment_source_comment_observations WHERE comment_id = ?
+    `).get(original.fullname);
+    expect(JSON.stringify(stored)).not.toContain(original.text);
+    expect(JSON.stringify(stored)).not.toContain(verdict.evidence);
+    expect(repo.getVerdict(comment('Edited: I would really love that done to me'))).toBeNull();
+  });
+});