Delete row sig_615876a41fad from signals

id sig_615876a41fad
event_id evt_bf9947d9fc0d
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:2026-04-11T13
throttle_s 0
created_at 2026-04-11T13:01:30.968023+00:00
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