Delete row sig_7c8c27bab7d6 from signals

id sig_7c8c27bab7d6
event_id evt_ef34a86fcd62
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:2026-04-15T01
throttle_s 0
created_at 2026-04-15T01:01:18.330775+00:00
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