Delete row sig_6fef44c66cf4 from signals

id sig_6fef44c66cf4
event_id evt_9a4f0357fd5a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T09:38:19.704467+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:3aa94274ffa4b4c4
throttle_s 0
created_at 2026-04-11T09:38:19.704467+00:00
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