Delete row sig_e9b2148e6550 from signals

id sig_e9b2148e6550
event_id evt_6d49d2bef3dd
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:2026-04-11T15
throttle_s 0
created_at 2026-04-11T15:01:46.249649+00:00
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