Delete row sig_cf7ef4a98e0c from signals

id sig_cf7ef4a98e0c
event_id evt_755c67e5214a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T08:49:09.912036+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:141110c858e08788
throttle_s 0
created_at 2026-04-18T08:49:09.912036+00:00
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