Delete row sig_f78ea516239f from signals

id sig_f78ea516239f
event_id evt_1778f9988e01
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_ac3ea9ea1 ...
dedupe_key signal_enriched:news_delta:44fd9358a93e9ddc
throttle_s 0
created_at 2026-04-06T23:19:12.061616+00:00
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