Delete row sig_6555d1022983 from signals

id sig_6555d1022983
event_id evt_9a34f9bd5fff
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_a1c1711eb ...
dedupe_key signal_enriched:discovery_ipo_delta:d12800d6d2ec04 ...
throttle_s 0
created_at 2026-04-20T13:10:00.946643+00:00
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