Delete row sig_9776c920ccc8 from signals

id sig_9776c920ccc8
event_id evt_0bc9c03e36f7
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_be8fd5ad7 ...
dedupe_key signal_enriched:discovery_ipo_delta:d2626732a05ca0 ...
throttle_s 0
created_at 2026-04-20T01:00:47.909969+00:00
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