Delete row sig_b7d579f17ea8 from signals

id sig_b7d579f17ea8
event_id evt_26831d8be4de
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T18:27:38.141708+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:385c29252453a2a2
throttle_s 0
created_at 2026-04-18T18:27:38.141708+00:00
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