Delete row sig_b149387fe3c2 from signals

id sig_b149387fe3c2
event_id evt_255619d6cede
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-20T20:32:04.849146+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:85b16852c4f4b008
throttle_s 0
created_at 2026-04-20T20:32:04.849146+00:00
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