Delete row sig_12778fc0d77d from signals

id sig_12778fc0d77d
event_id evt_0f5904f1a08d
watcher_id NULL
signal_type market_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {"_evidence_event_ids":["evt_691efc7af ...
dedupe_key signal_enriched:market_headline_delta:5514b6d4a1d4 ...
throttle_s 0
created_at 2026-04-14T22:34:43.815896+00:00
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