Delete row sig_f06805c92dbf from signals

id sig_f06805c92dbf
event_id evt_b34546d326cd
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_d9efa5946 ...
dedupe_key signal_enriched:discovery_ipo_delta:63587e4c949cae ...
throttle_s 0
created_at 2026-04-10T12:11:33.277556+00:00
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