Delete row sig_f42e9c3b1400 from signals

id sig_f42e9c3b1400
event_id evt_ca21ccc3319f
watcher_id NULL
signal_type system_distress
value {"alerts":[{"level":"critical& ...
threshold NULL
direction NULL
severity high
window NULL
source observability
reason_trace {}
dedupe_key observability_alert:2026-04-11T16
throttle_s 0
created_at 2026-04-11T16:01:52.938185+00:00
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