Delete row sig_d1827f0178a1 from signals

id sig_d1827f0178a1
event_id evt_5f2403ba781d
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_2654850cb ...
dedupe_key signal_enriched:market_headline_delta:b486286d80e3 ...
throttle_s 0
created_at 2026-04-12T13:57:00.935392+00:00
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