Delete row sig_7cc07c24161a from signals

id sig_7cc07c24161a
event_id evt_c8d582139f9a
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:2026-04-19T04
throttle_s 0
created_at 2026-04-19T04:02:21.539750+00:00
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