Delete row sig_454944297fb3 from signals

id sig_454944297fb3
event_id evt_633a3f9940fd
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-14T18:50:41.127595+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:c393314d94bb3736
throttle_s 0
created_at 2026-04-14T18:50:41.127595+00:00
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