Delete row sig_d689eda76f51 from signals

id sig_d689eda76f51
event_id evt_35be902b7600
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:2026-04-20T01
throttle_s 0
created_at 2026-04-20T01:04:39.961833+00:00
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