Delete row sig_4dc99067d752 from signals

id sig_4dc99067d752
event_id evt_3b8294635972
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-18T07:08:15.115270+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:9b76efb602b63482
throttle_s 0
created_at 2026-04-18T07:08:15.115270+00:00
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