Delete row sig_9443ff7fab67 from signals

id sig_9443ff7fab67
event_id evt_779ab12d79b2
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-18T04:05:36.733191+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:af33678d93f99202
throttle_s 0
created_at 2026-04-18T04:05:36.733191+00:00
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