Delete row sig_fd0b4e3116c4 from signals

id sig_fd0b4e3116c4
event_id evt_48ea46c02de9
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:2026-04-17T03
throttle_s 0
created_at 2026-04-17T03:01:50.340746+00:00
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