Delete row sig_163019428ac3 from signals

id sig_163019428ac3
event_id evt_92b2b437f06a
watcher_id NULL
signal_type system_distress
value {"alerts":[{"lag":11759,"level ...
threshold NULL
direction NULL
severity high
window NULL
source observability
reason_trace {}
dedupe_key observability_alert:2026-04-10T01
throttle_s 0
created_at 2026-04-10T01:03:30.953666+00:00
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