Delete row sig_974bed8f784b from signals

id sig_974bed8f784b
event_id evt_8f16fdb5431c
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:2026-04-22T05
throttle_s 0
created_at 2026-04-22T05:03:21.892288+00:00
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