Delete row sig_aa30a4d9f28f from signals

id sig_aa30a4d9f28f
event_id evt_24be19e0062c
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:2026-04-21T08
throttle_s 0
created_at 2026-04-21T08:01:06.187743+00:00
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