Delete row sig_539a298df26d from signals

id sig_539a298df26d
event_id evt_00e6cf972bb3
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_b0dab4276 ...
dedupe_key signal_enriched:discovery_ipo_delta:f236b361b58141 ...
throttle_s 0
created_at 2026-04-04T20:11:01.502087+00:00
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