Delete row sig_ef4e8e8df8e7 from signals

id sig_ef4e8e8df8e7
event_id evt_a53b359f7c15
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T20:48:53.966362+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b47372a89b65c67a
throttle_s 0
created_at 2026-04-18T20:48:53.966362+00:00
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