Delete row sig_11085f1b2bca from signals

id sig_11085f1b2bca
event_id evt_ae967297e766
watcher_id NULL
signal_type discovery_ipo_snapshot
value {"as_of":"2026-04-21T16:48:38.961675+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_ipo_snapshot:ce19491112929cf4
throttle_s 0
created_at 2026-04-21T16:48:38.961675+00:00
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