Delete row sig_d1d0cd179ef7 from signals

id sig_d1d0cd179ef7
event_id evt_193018870c7a
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-12T08:43:49.623249+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:456080c642243565
throttle_s 0
created_at 2026-04-12T08:43:49.623249+00:00
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