Delete row sig_16d5641cb77d from signals

id sig_16d5641cb77d
event_id evt_6f3bc833439c
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_b11d8064e ...
dedupe_key signal_enriched:discovery_ipo_delta:0da104dd4df825 ...
throttle_s 0
created_at 2026-04-07T23:23:54.391414+00:00
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