Add resumable US policy news collectors and provenance

Collect official crypto and US policy documents with deterministic screening, full bodies and attachments, bounded retries, and durable history cursors. Preserve publication precision and source identity while keeping new collectors disabled.

Add real Congress, GovInfo, DOJ and Federal Register fixtures, offline capture replay, isolated database validation, and rollout instructions. Validate 982 backend tests, frontend checks, and 57 deployment control tests.

backend/alembic/versions/20261104_da1234567890_us_official_news.py

@@ -0,0 +1,25 @@
+"""Add disabled US official collectors and resumable provenance metadata."""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import JSONB
+
+revision = 'da1234567890'
+down_revision = 'c91234567890'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.add_column('sources', sa.Column('history_cursor', JSONB, nullable=False, server_default='{}'))
+    op.add_column('crawl_runs', sa.Column('stats', JSONB, nullable=False, server_default='{}'))
+    op.add_column('news_revisions', sa.Column('extra', JSONB, nullable=True))
+    table = sa.table('sources', *(sa.column(k) for k in ('code', 'name', 'list_url', 'adapter', 'collector', 'enabled', 'interval_seconds', 'backfill_hours', 'consecutive_failures')))
+    op.bulk_insert(table, [{'code': 'sec', 'name': 'SEC·证券监管', 'list_url': 'https://www.sec.gov/newsroom/press-releases', 'adapter': 'builtin', 'collector': 'news', 'enabled': False, 'interval_seconds': 300, 'backfill_hours': 72, 'consecutive_failures': 0}, {'code': 'cftc', 'name': 'CFTC·衍生品监管', 'list_url': 'https://www.cftc.gov/PressRoom/PressReleases', 'adapter': 'builtin', 'collector': 'news', 'enabled': False, 'interval_seconds': 300, 'backfill_hours': 72, 'consecutive_failures': 0}, {'code': 'treasury', 'name': '美国财政部', 'list_url': 'https://home.treasury.gov/news/press-releases', 'adapter': 'builtin', 'collector': 'news', 'enabled': False, 'interval_seconds': 300, 'backfill_hours': 72, 'consecutive_failures': 0}, {'code': 'ofac', 'name': 'OFAC·金融制裁', 'list_url': 'https://ofac.treasury.gov/recent-actions', 'adapter': 'builtin', 'collector': 'news', 'enabled': False, 'interval_seconds': 300, 'backfill_hours': 72, 'consecutive_failures': 0}, {'code': 'fincen', 'name': 'FinCEN·反洗钱', 'list_url': 'https://www.fincen.gov/news/press-releases', 'adapter': 'builtin', 'collector': 'news', 'enabled': False, 'interval_seconds': 300, 'backfill_hours': 72, 'consecutive_failures': 0}, {'code': 'whitehouse', 'name': '白宫·政策', 'list_url': 'https://www.whitehouse.gov/presidential-actions/', 'adapter': 'builtin', 'collector': 'news', 'enabled': False, 'interval_seconds': 300, 'backfill_hours': 72, 'consecutive_failures': 0}, {'code': 'congress', 'name': '美国国会·立法', 'list_url': 'https://api.congress.gov/v3/bill?format=json&limit=250', 'adapter': 'builtin', 'collector': 'news', 'enabled': False, 'interval_seconds': 900, 'backfill_hours': 72, 'consecutive_failures': 0}, {'code': 'federal_register', 'name': 'Federal Register·规则', 'list_url': 'https://www.federalregister.gov/api/v1/documents.json', 'adapter': 'builtin', 'collector': 'news', 'enabled': False, 'interval_seconds': 900, 'backfill_hours': 72, 'consecutive_failures': 0}, {'code': 'occ', 'name': 'OCC·银行与稳定币', 'list_url': 'https://www.occ.gov/news-events/newsroom/news-issuances-by-year/news-releases/2026-news-releases.html', 'adapter': 'builtin', 'collector': 'news', 'enabled': False, 'interval_seconds': 300, 'backfill_hours': 72, 'consecutive_failures': 0}, {'code': 'doj', 'name': 'DOJ·加密机构执法', 'list_url': 'https://www.justice.gov/api/v1/press_releases.json?pagesize=50&sort=date&direction=DESC&fields=uuid,date', 'adapter': 'builtin', 'collector': 'news', 'enabled': False, 'interval_seconds': 300, 'backfill_hours': 72, 'consecutive_failures': 0}])
+
+
+def downgrade():
+    # Foreign keys intentionally reject removal of sources with collected data.
+    op.execute("DELETE FROM sources WHERE code IN ('sec','cftc','treasury','ofac','fincen','whitehouse','congress','federal_register','occ','doj')")
+    op.drop_column('news_revisions', 'extra')
+    op.drop_column('crawl_runs', 'stats')
+    op.drop_column('sources', 'history_cursor')