Delete row sig_28cc454be1a4 from signals

id sig_28cc454be1a4
event_id evt_958b7f68c86d
watcher_id NULL
signal_type system_distress
value {"alerts":[{"count":2,"level&# ...
threshold NULL
direction NULL
severity medium
window NULL
source observability
reason_trace {}
dedupe_key observability_alert:2026-04-08T00
throttle_s 0
created_at 2026-04-08T00:03:24.293228+00:00
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