Delete row sig_d3ee0c8ab244 from signals

id sig_d3ee0c8ab244
event_id evt_11e1da30b7d3
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-22T12:11:11.615562+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:ac3e9f189e11a44f
throttle_s 0
created_at 2026-04-22T12:11:11.615562+00:00
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