Delete row sig_1a33f788f7f3 from signals

id sig_1a33f788f7f3
event_id evt_c092eb1c14f2
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_15261f2aa ...
dedupe_key signal_enriched:market_headline_delta:3974949ed89c ...
throttle_s 0
created_at 2026-04-12T10:44:03.557778+00:00
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