Delete row sig_637e527b104d from signals

id sig_637e527b104d
event_id evt_c488fa218752
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-12T14:47:21.648486+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:dd3f9c034a62fa32
throttle_s 0
created_at 2026-04-12T14:47:21.648486+00:00
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