Delete row sig_f975a9a35324 from signals

id sig_f975a9a35324
event_id evt_0bf8f0ec4f9e
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-17T21:52:12.771365+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:4a84b89978c3f431
throttle_s 0
created_at 2026-04-17T21:52:12.771365+00:00
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