Delete row sig_5b4f305aa19f from signals

id sig_5b4f305aa19f
event_id evt_f2ec5afd94ee
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_8d7159d72 ...
dedupe_key signal_enriched:discovery_ipo_delta:6675f2a514a327 ...
throttle_s 0
created_at 2026-04-12T11:45:34.865983+00:00
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