Delete row sig_168931e9d12b from signals

id sig_168931e9d12b
event_id evt_b6c83a77f5c6
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_63e355860 ...
dedupe_key signal_enriched:discovery_ipo_delta:4f49587d27b33e ...
throttle_s 0
created_at 2026-04-20T12:09:20.977224+00:00
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