Delete row sig_78ab857ecf4c from signals

id sig_78ab857ecf4c
event_id evt_a7e95e069292
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:2026-04-19T22
throttle_s 0
created_at 2026-04-19T22:04:24.310007+00:00
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