Delete row sig_cc8a03c495f2 from signals

id sig_cc8a03c495f2
event_id evt_88376709dc33
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-14T13:14:01.403622+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:31aa53cc4c3d9578
throttle_s 0
created_at 2026-04-14T13:14:01.403622+00:00
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