Delete row sig_207b2f3f8bfa from signals

id sig_207b2f3f8bfa
event_id evt_714eb782ee5c
watcher_id NULL
signal_type discovery_ipo_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_7bec5e460 ...
dedupe_key signal_enriched:discovery_ipo_delta:892dbad213089b ...
throttle_s 0
created_at 2026-04-21T16:48:38.963204+00:00
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