Delete row sig_68c33cf610a9 from signals

id sig_68c33cf610a9
event_id evt_8cc792565cb6
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_178ce5bc8 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:2cdce4d ...
throttle_s 0
created_at 2026-04-09T03:12:49.786272+00:00
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