Delete row sig_56ff2a30a854 from signals

id sig_56ff2a30a854
event_id evt_34037f285054
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-19T18:44:42.561432+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:e1594d768ec903ad
throttle_s 0
created_at 2026-04-19T18:44:42.561432+00:00
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