Delete row sig_54649b774c4f from signals

id sig_54649b774c4f
event_id evt_8e304954b277
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_8f9acc68d ...
dedupe_key signal_enriched:market_headline_delta:e8d4cf541535 ...
throttle_s 0
created_at 2026-04-18T00:01:34.746398+00:00
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