Delete row sig_f78741017ce7 from signals

id sig_f78741017ce7
event_id evt_23a4ca696240
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_be200e013 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:bcf0ca0 ...
throttle_s 0
created_at 2026-04-18T03:05:05.644967+00:00
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