Delete row sig_d065e2c9141f from signals

id sig_d065e2c9141f
event_id evt_b173942671b5
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-20T15:42:12.812874+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:a3263ef509e57ca6
throttle_s 0
created_at 2026-04-20T15:42:12.812874+00:00
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