Delete row sig_b8cf29002c20 from signals

id sig_b8cf29002c20
event_id evt_ad188a1f8534
watcher_id NULL
signal_type discovery_ipo_snapshot
value {"as_of":"2026-04-19T00:47:45.188515+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_ipo_snapshot:4b93bcd46290a819
throttle_s 0
created_at 2026-04-19T00:47:45.188515+00:00
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