Delete row sig_771d5149ff19 from signals

id sig_771d5149ff19
event_id evt_d64338c437af
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_74ce71cde ...
dedupe_key signal_enriched:discovery_sec_filing_delta:52c036e ...
throttle_s 0
created_at 2026-04-14T02:04:49.876253+00:00
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