Delete row sig_40a36ac0b2fa from signals

id sig_40a36ac0b2fa
event_id evt_190c3e5c48e3
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:2026-04-21T19
throttle_s 0
created_at 2026-04-21T19:02:20.768706+00:00
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