Delete row sig_762f9af1ba12 from signals

id sig_762f9af1ba12
event_id evt_216571a71a31
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-11T00:11:50.547969+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:c382541abd4e8b19
throttle_s 0
created_at 2026-04-11T00:11:50.547969+00:00
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