Delete row sig_4b10a620970c from signals

id sig_4b10a620970c
event_id evt_dd2bd057f7b2
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:2026-04-21T07
throttle_s 0
created_at 2026-04-21T07:01:00.602078+00:00
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