Delete row sig_2582fe4a4cea from signals

id sig_2582fe4a4cea
event_id evt_252ab347e0d5
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:2026-04-17T13
throttle_s 0
created_at 2026-04-17T13:02:55.161095+00:00
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