Delete row sig_66daca49a61a from signals

id sig_66daca49a61a
event_id evt_2ef31f163c50
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:2026-04-21T11
throttle_s 0
created_at 2026-04-21T11:01:29.757224+00:00
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