Delete row sig_fa6160ee8cb8 from signals

id sig_fa6160ee8cb8
event_id evt_a26c82fcc148
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T13:34:47.434177+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:69593209bb14346b
throttle_s 0
created_at 2026-04-18T13:34:47.434177+00:00
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