Delete row sig_8d31812cbabf from signals

id sig_8d31812cbabf
event_id evt_c281c9c93c41
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-12T13:46:53.258055+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:2e77ab9beccd83f5
throttle_s 0
created_at 2026-04-12T13:46:53.258055+00:00
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