Delete row sig_51ec729109a6 from signals

id sig_51ec729109a6
event_id evt_7c1383556f76
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-20T03:01:53.631575+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:64172d5235fc5924
throttle_s 0
created_at 2026-04-20T03:01:53.631575+00:00
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