Delete row sig_869d5c0bdd93 from signals

id sig_869d5c0bdd93
event_id evt_d7928708c07b
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_bdbb21852 ...
dedupe_key signal_enriched:discovery_ipo_delta:b7a0941002e136 ...
throttle_s 0
created_at 2026-04-16T15:51:11.060198+00:00
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