Delete row sig_bfb226fce7db from signals

id sig_bfb226fce7db
event_id evt_5c3203b995ed
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-11T13:38:22.070566+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:12a678781aeb8ea9
throttle_s 0
created_at 2026-04-11T13:38:22.070566+00:00
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