Delete row sig_8f00b5622ff4 from signals

id sig_8f00b5622ff4
event_id evt_ed61e5f4228b
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-09T15:06:58.939567+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:2296f190ebd7bc9a
throttle_s 0
created_at 2026-04-09T15:06:58.939567+00:00
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