feat(news): restrict research to local sources and process frozen batches

backend/alembic/versions/20261105_dc3456789012_research_batches.py

@@ -0,0 +1,33 @@
+"""Persist frozen two-stage research batches without rewriting research history."""
+from alembic import op
+import sqlalchemy as sa
+
+revision = 'dc3456789012'
+down_revision = 'db2345678901'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.create_table('news_research_batches',
+        sa.Column('id', sa.BigInteger(), primary_key=True),
+        sa.Column('phase', sa.String(20), nullable=False),
+        sa.Column('cutoff_at', sa.DateTime(timezone=True), nullable=False),
+        sa.Column('finished_at', sa.DateTime(timezone=True), nullable=True))
+    op.create_index('ix_news_research_batches_phase', 'news_research_batches', ['phase'])
+    op.create_table('news_research_batch_packages',
+        sa.Column('batch_id', sa.BigInteger(), sa.ForeignKey('news_research_batches.id'), primary_key=True),
+        sa.Column('package_id', sa.BigInteger(), sa.ForeignKey('news_research_packages.id'), primary_key=True),
+        sa.Column('content_hash', sa.String(64), nullable=False),
+        sa.Column('state', sa.String(20), nullable=False))
+    op.create_table('news_research_batch_events',
+        sa.Column('batch_id', sa.BigInteger(), sa.ForeignKey('news_research_batches.id'), primary_key=True),
+        sa.Column('event_id', sa.BigInteger(), sa.ForeignKey('news_research_events.id'), primary_key=True),
+        sa.Column('revision', sa.Integer(), nullable=False),
+        sa.Column('state', sa.String(20), nullable=False))
+
+
+def downgrade():
+    op.drop_table('news_research_batch_events')
+    op.drop_table('news_research_batch_packages')
+    op.drop_table('news_research_batches')