Delete row sig_27413ac4e140 from signals

id sig_27413ac4e140
event_id evt_a24f52caa262
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T09:00:12.310874+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1eefb3e53be1f13d
throttle_s 0
created_at 2026-04-18T09:00:12.310874+00:00
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