Delete row sig_6088f3e1ffde from signals

id sig_6088f3e1ffde
event_id evt_9b288e35f746
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:2026-04-19T23
throttle_s 0
created_at 2026-04-19T23:04:25.674661+00:00
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