Delete row sig_e9476d685db6 from signals

id sig_e9476d685db6
event_id evt_5d9fc6cc0351
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_1b804ef8c ...
dedupe_key signal_enriched:discovery_sec_filing_delta:b6fee66 ...
throttle_s 0
created_at 2026-04-07T03:18:43.308311+00:00
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