Delete row sig_ef9c639ba1dd from signals

id sig_ef9c639ba1dd
event_id evt_f7d292c20f04
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:2026-04-16T06
throttle_s 0
created_at 2026-04-16T06:04:42.317081+00:00
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