Delete row sig_2811e9d3b217 from signals

id sig_2811e9d3b217
event_id evt_3606f03a47e9
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:2026-04-20T18
throttle_s 0
created_at 2026-04-20T18:01:26.308415+00:00
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