Delete row sig_2b4fe2b241a4 from signals

id sig_2b4fe2b241a4
event_id evt_21c554a896eb
watcher_id NULL
signal_type discovery_sec_filing_delta
value {"aggregator_url":"https://www.sec.gov ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_sec_filings
reason_trace {"_evidence_event_ids":["evt_9ac62528e ...
dedupe_key signal_enriched:discovery_sec_filing_delta:8638bc3 ...
throttle_s 0
created_at 2026-04-21T03:09:54.871544+00:00
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