Delete row sig_6975c7268323 from signals

id sig_6975c7268323
event_id evt_64dbb6c03338
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_7e9f2fe8f ...
dedupe_key signal_enriched:discovery_ipo_delta:9fcdeae9b03c92 ...
throttle_s 0
created_at 2026-04-18T14:14:09.415921+00:00
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