Delete row sig_ff9cf97615d4 from signals

id sig_ff9cf97615d4
event_id evt_83ee2f2d6200
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-17T02:13:18.112889+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:d17c7ee39f337790
throttle_s 0
created_at 2026-04-17T02:13:18.112889+00:00
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