Delete row sig_4a135021ccf1 from signals

id sig_4a135021ccf1
event_id evt_7974161a27dc
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_d53d46877 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:f14a73e ...
throttle_s 0
created_at 2026-04-18T03:05:05.644967+00:00
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