Delete row sig_00538b8143ab from signals

id sig_00538b8143ab
event_id evt_1b449c308311
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:2026-04-11T05
throttle_s 0
created_at 2026-04-11T05:00:34.519166+00:00
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