Delete row sig_df0f6e6d1589 from signals

id sig_df0f6e6d1589
event_id evt_ac14cc4cf60c
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-18T18:48:29.554575+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:8c3a1009637b4725
throttle_s 0
created_at 2026-04-18T18:48:29.554575+00:00
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