Delete row sig_2df99d7c3dbc from signals

id sig_2df99d7c3dbc
event_id evt_1e6eed9c79f0
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_d28cc9b8c ...
dedupe_key signal_enriched:discovery_ipo_delta:08c598abc41b6e ...
throttle_s 0
created_at 2026-04-09T03:12:49.786272+00:00
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