Delete row sig_86c57d507371 from signals

id sig_86c57d507371
event_id evt_830b3a545a4a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T20:50:21.956781+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:3ca3676f9409b466
throttle_s 0
created_at 2026-04-14T20:50:21.956781+00:00
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