Delete row sig_4cfcee3372be from signals

id sig_4cfcee3372be
event_id evt_b50a268dc162
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T12:48:10.416208+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ebbb50704b726acf
throttle_s 0
created_at 2026-04-16T12:48:10.416208+00:00
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