Delete row sig_ef1ab1ab50bc from signals

id sig_ef1ab1ab50bc
event_id evt_7bbe28e666cd
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-11T16:37:43.470636+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:576e235ef51cf078
throttle_s 0
created_at 2026-04-11T16:37:43.470636+00:00
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