Delete row sig_6996d559dd9d from signals

id sig_6996d559dd9d
event_id evt_516f8a71e539
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_bd9f796d7 ...
dedupe_key signal_enriched:discovery_ipo_delta:5274877b21d30e ...
throttle_s 0
created_at 2026-04-11T18:07:35.151873+00:00
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