Delete row sig_83b182129dd4 from signals

id sig_83b182129dd4
event_id evt_92ca64b44c99
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_55ac49c19 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:a04fd98 ...
throttle_s 0
created_at 2026-04-22T03:03:32.063787+00:00
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