Delete row sig_4e1b37893322 from signals

id sig_4e1b37893322
event_id evt_df2208823af5
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_f433f325f ...
dedupe_key signal_enriched:discovery_sec_filing_delta:85c7183 ...
throttle_s 0
created_at 2026-04-10T03:04:31.796915+00:00
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