Delete row sig_da937c17350a from signals

id sig_da937c17350a
event_id evt_f6976d433466
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_7d9445561 ...
dedupe_key signal_enriched:discovery_ipo_delta:8496307fe3e4ff ...
throttle_s 0
created_at 2026-04-17T23:00:32.547123+00:00
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