Delete row sig_919002682650 from signals

id sig_919002682650
event_id evt_a1555ae70de4
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-12T12:46:13.192941+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:b224d47ea76f21ea
throttle_s 0
created_at 2026-04-12T12:46:13.192941+00:00
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