Delete row sig_e9b60004b6c1 from signals

id sig_e9b60004b6c1
event_id evt_1ecf44478fef
watcher_id NULL
signal_type system_distress
value {"alerts":[{"lag":15011,"level ...
threshold NULL
direction NULL
severity high
window NULL
source observability
reason_trace {}
dedupe_key observability_alert:2026-04-10T09
throttle_s 0
created_at 2026-04-10T09:04:25.196537+00:00
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