Delete row sig_b9645fea54b7 from signals

id sig_b9645fea54b7
event_id evt_2b32679c2e6b
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-10T08:08:24.082687+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:6e11591d963489e6
throttle_s 0
created_at 2026-04-10T08:08:24.082687+00:00
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