Delete row sig_45ceb597f2ca from signals

id sig_45ceb597f2ca
event_id evt_905867bff479
watcher_id NULL
signal_type system_distress
value {"alerts":[{"level":"warn" ...
threshold NULL
direction NULL
severity medium
window NULL
source observability
reason_trace {}
dedupe_key observability_alert:2026-04-09T12
throttle_s 0
created_at 2026-04-09T12:01:22.149418+00:00
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