Delete row sig_78ffbe8685bf from signals

id sig_78ffbe8685bf
event_id evt_ba2578c40b3a
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_46bd39336 ...
dedupe_key signal_enriched:news_delta:6f7522af2cfe6628
throttle_s 0
created_at 2026-04-16T13:30:15.505410+00:00
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