Delete row sig_342d2fa9c2f6 from signals

id sig_342d2fa9c2f6
event_id evt_931499509f63
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_3de72a9ba ...
dedupe_key signal_enriched:discovery_sec_filing_delta:a4afc7a ...
throttle_s 0
created_at 2026-04-03T11:12:58.166696+00:00
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