Delete row sig_7648fd0cd910 from signals

id sig_7648fd0cd910
event_id evt_e0852fdb2989
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T22:44:20.621452+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4b1524e42bc5a9aa
throttle_s 0
created_at 2026-04-09T22:44:20.621452+00:00
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