Delete row sig_f9d62f7b4478 from signals

id sig_f9d62f7b4478
event_id evt_307c0171017c
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-20T00:00:14.080647+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:616877fd1f0ff354
throttle_s 0
created_at 2026-04-20T00:00:14.080647+00:00
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