Delete row sig_cac4899eae3a from signals

id sig_cac4899eae3a
event_id evt_00f492469719
watcher_id NULL
signal_type delivery_failure
value {"delivery_fp":"slk_thread_reply:ee026 ...
threshold NULL
direction NULL
severity high
window NULL
source slack_outbox
reason_trace {}
dedupe_key delivery_failure:2026-04-08:slk_thread_reply:ee026 ...
throttle_s 0
created_at 2026-04-08T23:20:52.516579+00:00
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