Delete row sig_15970d751f09 from signals

id sig_15970d751f09
event_id evt_675e649feeb4
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_a2744b318 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:484559a ...
throttle_s 0
created_at 2026-04-08T19:57:42.365437+00:00
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