Delete row sig_5fcba826885e from signals

id sig_5fcba826885e
event_id evt_730423f58cd1
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_7cb3a6501 ...
dedupe_key signal_enriched:market_headline_delta:96f2215ca54a ...
throttle_s 0
created_at 2026-04-20T08:11:21.661418+00:00
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