Delete row sig_cd43944ad3a3 from signals

id sig_cd43944ad3a3
event_id evt_ead9c357912d
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:2026-04-17T21
throttle_s 0
created_at 2026-04-17T21:03:52.159138+00:00
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