Delete row sig_9eef22727dc1 from signals

id sig_9eef22727dc1
event_id evt_f23f3b6ad454
watcher_id NULL
signal_type system_distress
value {"alerts":[{"lag":13162,"level ...
threshold NULL
direction NULL
severity high
window NULL
source observability
reason_trace {}
dedupe_key observability_alert:2026-04-10T03
throttle_s 0
created_at 2026-04-10T03:03:45.919161+00:00
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