Delete row sig_21c8d2d5e131 from signals

id sig_21c8d2d5e131
event_id evt_bf04d80819e5
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:2026-04-16T20
throttle_s 0
created_at 2026-04-16T20:01:40.589133+00:00
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