Delete row sig_af8b9c375a69 from signals

id sig_af8b9c375a69
event_id evt_cef256bcecf9
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_cb1abd74c ...
dedupe_key signal_enriched:discovery_sec_filing_delta:bb85209 ...
throttle_s 0
created_at 2026-04-11T03:10:51.104915+00:00
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