Delete row sig_78df81559bc1 from signals

id sig_78df81559bc1
event_id evt_9c3860ad938d
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_007b14dc5 ...
dedupe_key signal_enriched:news_delta:1c25ad2a076ba9e7
throttle_s 0
created_at 2026-04-13T01:48:35.745484+00:00
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