Delete row sig_c3dab135095c from signals

id sig_c3dab135095c
event_id evt_33123416733b
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-20T13:10:00.943306+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:bf82310316405fb4
throttle_s 0
created_at 2026-04-20T13:10:00.943306+00:00
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