Delete row sig_3f3b789bb52c from signals

id sig_3f3b789bb52c
event_id evt_f86d3fa92313
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:2026-04-21T13
throttle_s 0
created_at 2026-04-21T13:01:41.728102+00:00
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