Delete row sig_7f2c6c44ec2b from signals

id sig_7f2c6c44ec2b
event_id evt_add2ca55c3f9
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_9fd44c0a7 ...
dedupe_key signal_enriched:discovery_ipo_delta:a5abab0a1942b4 ...
throttle_s 0
created_at 2026-04-16T10:15:40.769768+00:00
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