Delete row sig_c970d9e63774 from signals

id sig_c970d9e63774
event_id evt_acd0469075c8
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-19T15:45:47.771362+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:2f6e18036c3254d9
throttle_s 0
created_at 2026-04-19T15:45:47.771362+00:00
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