Delete row sig_66d0c2ca71e7 from signals

id sig_66d0c2ca71e7
event_id evt_3328b42f4af6
watcher_id NULL
signal_type discovery_ipo_snapshot
value {"as_of":"2026-04-12T11:45:34.865035+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_ipo_snapshot:ad8ed7503be2d626
throttle_s 0
created_at 2026-04-12T11:45:34.865035+00:00
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