Delete row sig_ce8edcf15fca from signals

id sig_ce8edcf15fca
event_id evt_720a6d346587
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-19T20:14:07.003000+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:ea293d3d3a26ffab
throttle_s 0
created_at 2026-04-19T20:14:07.003000+00:00
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