Delete row sig_c70e2e8802d0 from signals

id sig_c70e2e8802d0
event_id evt_d761366c0557
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:2026-04-11T04
throttle_s 0
created_at 2026-04-11T04:00:29.602881+00:00
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