Delete row sig_c4c03caefd82 from signals

id sig_c4c03caefd82
event_id evt_a26e877287fd
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_e795326dd ...
dedupe_key signal_enriched:discovery_ipo_delta:6cc041f907952d ...
throttle_s 0
created_at 2026-04-17T21:52:12.771882+00:00
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