Delete row sig_fcee495a7805 from signals

id sig_fcee495a7805
event_id evt_46588d928cbf
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T08:47:47.792846+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:28fc30c6eab420ce
throttle_s 0
created_at 2026-04-16T08:47:47.792846+00:00
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