Delete row sig_98ce88b101fd from signals

id sig_98ce88b101fd
event_id evt_2f57c70d77dd
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_0e2bbda90 ...
dedupe_key signal_enriched:market_headline_delta:597a200b2231 ...
throttle_s 0
created_at 2026-04-19T11:09:37.029931+00:00
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