Delete row sig_b250c74d5c0c from signals

id sig_b250c74d5c0c
event_id evt_f103f5b7e97c
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-19T03:47:18.530626+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:2f36d36898b4abb5
throttle_s 0
created_at 2026-04-19T03:47:18.530626+00:00
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