Delete row sig_fb6c2ad9d4bd from signals

id sig_fb6c2ad9d4bd
event_id evt_a786849ee1ba
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_f63634d9d ...
dedupe_key signal_enriched:discovery_sec_filing_delta:25590e8 ...
throttle_s 0
created_at 2026-04-22T03:03:32.063787+00:00
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