Delete row sig_010ccb93dff0 from signals

id sig_010ccb93dff0
event_id evt_ac65be0d572f
watcher_id NULL
signal_type system_distress
value {"alerts":[{"level":"warn" ...
threshold NULL
direction NULL
severity high
window NULL
source observability
reason_trace {}
dedupe_key observability_alert:2026-04-10T18
throttle_s 0
created_at 2026-04-10T18:04:33.130547+00:00
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