Delete row sig_669eda1f3fc6 from signals

id sig_669eda1f3fc6
event_id evt_94e8e4abe796
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_c1349c300 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:737c3f9 ...
throttle_s 0
created_at 2026-04-18T03:05:05.644967+00:00
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