Delete row sig_b564db776d8c from signals

id sig_b564db776d8c
event_id evt_131696f70a61
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:2026-04-18T20
throttle_s 0
created_at 2026-04-18T20:01:30.510739+00:00
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