Delete row sig_839760354bd4 from signals

id sig_839760354bd4
event_id evt_1f06a9814936
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_440ad756e ...
dedupe_key signal_enriched:discovery_sec_filing_delta:3c2bc43 ...
throttle_s 0
created_at 2026-04-22T03:03:32.063787+00:00
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