Delete row sig_9bbe641f21b1 from signals

id sig_9bbe641f21b1
event_id evt_994c6e9c669f
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_05beb7108 ...
dedupe_key signal_enriched:discovery_ipo_delta:050f6ea0f7ae0b ...
throttle_s 0
created_at 2026-04-17T00:43:39.064220+00:00
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