fix(prometheus): a refused token stops the scraping, as Home Assistant bans an address after a few refusals (#6355)

Also names the Home Assistant connection by its address in the audit log and
timeline, where its id showed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugins/prometheus/migrations/versions/prometheus_003_refused.py

@@ -0,0 +1,23 @@
+"""A target whose token was refused stops being scraped until it is saved
+
+Revision ID: prometheus_003_refused
+Revises: prometheus_002_templates
+Create Date: 2026-11-01
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "prometheus_003_refused"
+down_revision: Union[str, None] = "prometheus_002_templates"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("prometheus_targets", sa.Column("refused", sa.Boolean, nullable=False, server_default=sa.false()))
+
+
+def downgrade() -> None:
+    op.drop_column("prometheus_targets", "refused")