Delete row sig_77eac09188e0 from signals

id sig_77eac09188e0
event_id evt_a4118aa23774
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_8ea1e6ddd ...
dedupe_key signal_enriched:discovery_sec_filing_delta:f4c6aa9 ...
throttle_s 0
created_at 2026-04-17T02:13:18.114675+00:00
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