feat: integrate files and portal surfaces

src/govoplan_postbox/backend/migrations/versions/f2a5c8e1b4d7_v015_portal_visibility.py

@@ -0,0 +1,33 @@
+"""Add explicit portal visibility to Postbox template revisions.
+
+Revision ID: f2a5c8e1b4d7
+Revises: e9f4a7b2c5d8
+"""
+
+from __future__ import annotations
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = "f2a5c8e1b4d7"
+down_revision = "e9f4a7b2c5d8"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    with op.batch_alter_table("postbox_template_revisions") as batch:
+        batch.add_column(
+            sa.Column(
+                "portal_visible",
+                sa.Boolean(),
+                nullable=False,
+                server_default=sa.false(),
+            )
+        )
+
+
+def downgrade() -> None:
+    with op.batch_alter_table("postbox_template_revisions") as batch:
+        batch.drop_column("portal_visible")