Delete row sig_0886b7d46345 from signals

id sig_0886b7d46345
event_id evt_e3bdfa9c9815
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_268fd1cac ...
dedupe_key signal_enriched:market_headline_delta:ced3a14522ab ...
throttle_s 0
created_at 2026-04-22T12:51:40.769923+00:00
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