Delete row sig_749c03468e34 from signals

id sig_749c03468e34
event_id evt_1b62f325d7c4
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_64f8f3172 ...
dedupe_key signal_enriched:discovery_ipo_delta:bd1e57fcc3f896 ...
throttle_s 0
created_at 2026-04-22T15:21:13.336230+00:00
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