Delete row sig_470de96f46fe from signals

id sig_470de96f46fe
event_id evt_3a171ac10d0d
watcher_id NULL
signal_type discovery_ipo_snapshot
value {"as_of":"2026-04-21T03:09:54.871310+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_ipo_snapshot:88c7b7d9f19754e0
throttle_s 0
created_at 2026-04-21T03:09:54.871310+00:00
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