Delete row sig_b4f19adbed8f from signals

id sig_b4f19adbed8f
event_id evt_b540ce512089
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_d7048b9a6 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:32bb894 ...
throttle_s 0
created_at 2026-04-16T02:08:52.472606+00:00
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