Delete row sig_9ee19244b286 from signals

id sig_9ee19244b286
event_id evt_0de037c4d730
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_2e7d4c47f ...
dedupe_key signal_enriched:discovery_ipo_delta:2b9051da8d7138 ...
throttle_s 0
created_at 2026-04-10T13:12:08.706840+00:00
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