Delete row sig_4764d7ebd531 from signals

id sig_4764d7ebd531
event_id evt_c999bff6273c
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_a72af15c3 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:8898da7 ...
throttle_s 0
created_at 2026-04-03T11:12:58.166696+00:00
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