Delete row sig_66dc5341275b from signals

id sig_66dc5341275b
event_id evt_efc762d15638
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-18T11:11:26.599041+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:6e2c88bac07255fc
throttle_s 0
created_at 2026-04-18T11:11:26.599041+00:00
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