Delete row sig_84ef403ed247 from signals

id sig_84ef403ed247
event_id evt_4e4f44c1b962
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T08:16:55.956823+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ace7904eb13884de
throttle_s 0
created_at 2026-04-16T08:16:55.956823+00:00
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