Delete row sig_0ef98f4ca2d5 from signals

id sig_0ef98f4ca2d5
event_id evt_20504195c12d
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-20T22:38:30.833857+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:d992d4dca9e3136c
throttle_s 0
created_at 2026-04-20T22:38:30.833857+00:00
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