Delete row sig_d77c9f5176ef from signals

id sig_d77c9f5176ef
event_id evt_d40483199fee
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_f983fde7b ...
dedupe_key signal_enriched:discovery_sec_filing_delta:3bb0e1f ...
throttle_s 0
created_at 2026-04-16T02:08:52.472606+00:00
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