Delete row sig_21400822c30a from signals

id sig_21400822c30a
event_id evt_abfe6d0e9b26
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_61f5a5103 ...
dedupe_key signal_enriched:discovery_ipo_delta:841e445c6b400d ...
throttle_s 0
created_at 2026-04-17T05:13:38.534721+00:00
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