feat: add broadcast category (system/news/promo) + filter recipients by user prefs

migrations/alembic/versions/0054_add_broadcast_category.py

@@ -0,0 +1,28 @@
+"""add broadcast category column
+
+Revision ID: 0054
+Revises: 0053
+Create Date: 2026-04-10
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = '0054'
+down_revision: Union[str, None] = '0053'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        'broadcast_history',
+        sa.Column('category', sa.String(20), nullable=False, server_default='system'),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column('broadcast_history', 'category')