Delete row sig_63273201384c from signals

id sig_63273201384c
event_id evt_fc0d4d5f6a5f
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-13T13:25:35.465471+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:8525b49fea2e4218
throttle_s 0
created_at 2026-04-13T13:25:35.465471+00:00
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