Delete row sig_da96ba5dfe00 from signals

id sig_da96ba5dfe00
event_id evt_86350de1b929
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:2026-04-20T10
throttle_s 0
created_at 2026-04-20T10:00:44.557437+00:00
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