Delete row sig_6fd0555a3ad8 from signals

id sig_6fd0555a3ad8
event_id evt_34944d89f814
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-10T05:06:44.648598+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:1994e325095a6f55
throttle_s 0
created_at 2026-04-10T05:06:44.648598+00:00
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