release(main): 同步 dev 最新候选改动

backend/alembic/versions/20260716_05_expand_generic_notifications.py

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+"""Expand generic notifications and route desktop delivery through them.
+
+Revision ID: 20260716_05
+Revises: 20260716_04
+"""
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql
+
+
+revision = "20260716_05"
+down_revision = "20260716_04"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "notifications",
+        sa.Column("requires_action", sa.Boolean(), nullable=False, server_default=sa.true()),
+    )
+    op.add_column(
+        "notifications",
+        sa.Column("due_at", sa.DateTime(timezone=True), nullable=True),
+    )
+    op.alter_column("desktop_notification_deliveries", "distribution_id", nullable=True)
+    op.add_column(
+        "desktop_notification_deliveries",
+        sa.Column("notification_id", postgresql.UUID(as_uuid=True), nullable=True),
+    )
+    op.create_foreign_key(
+        "fk_desktop_notification_deliveries_notification",
+        "desktop_notification_deliveries",
+        "notifications",
+        ["notification_id"],
+        ["id"],
+        ondelete="CASCADE",
+    )
+    op.create_unique_constraint(
+        "uq_desktop_notification_user_notification",
+        "desktop_notification_deliveries",
+        ["user_id", "notification_id"],
+    )
+
+
+def downgrade() -> None:
+    op.drop_constraint(
+        "uq_desktop_notification_user_notification",
+        "desktop_notification_deliveries",
+        type_="unique",
+    )
+    op.drop_constraint(
+        "fk_desktop_notification_deliveries_notification",
+        "desktop_notification_deliveries",
+        type_="foreignkey",
+    )
+    op.drop_column("desktop_notification_deliveries", "notification_id")
+    # Legacy rows always have a distribution id; rows created by the generic delivery path do not.
+    op.execute("DELETE FROM desktop_notification_deliveries WHERE distribution_id IS NULL")
+    op.alter_column("desktop_notification_deliveries", "distribution_id", nullable=False)
+    op.drop_column("notifications", "due_at")
+    op.drop_column("notifications", "requires_action")